Condition Analysis
AI-powered assessment using site data and 14-day weather history
Five consecutive dry days with warming temperatures and moderate wind should have dried the rock surface well, though today's elevated humidity (87%) and the crag's NW aspect mean some sheltered areas may retain dampness. Conditions are likely good but worth checking on arrival, especially on the north crag seepage lines.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag has persistent seepage lines that can remain damp for days after the prolonged wet spell from late July to early August, even after surface rock elsewhere has dried.
- The W/NW aspect means the crag misses morning sun entirely — afternoon sun from the west helps drying but the north crag receives very little direct sunlight at any time.
- Today's humidity has jumped to 87% with westerly winds blowing directly onto the crag face, which may slow final surface drying despite the five dry days.
- Peregrine nesting restrictions should be checked before visiting, as the season can extend into August — consult the BMC RAD for current status.
Warnings
2
- Check current peregrine nesting restrictions via the BMC RAD before visiting — seasonal closures can extend into August.
- Worsening weather from August 17 with 14.8mm forecast on Aug 18 will likely reset drying progress entirely.
Reasoning
Five dry days following the last rain (5.0mm on Aug 9) with three particularly warm and dry days (Aug 11–13, up to 23.7°C, humidity 55–68%) should have evaporated surface moisture from the non-porous BVS rock, though the preceding weeks saw nearly 48mm of cumulative rainfall that could sustain seepage lines.
Moderate to strong southerly winds during the key drying window (Aug 11–13) would have been less effective on this W/NW-facing crag, but the warm temperatures and low humidity compensate; today's shift to westerly winds blows directly onto the face, aiding any remaining surface drying.
No structural risk — Borrowdale Volcanic Series rock is non-porous and does not suffer weakening when wet; the concern is purely friction loss on damp surfaces.
Mid-August is well within the optimal summer climbing window; daylight hours are still long enough for approach, climbing, and descent, though temperatures have cooled notably from the recent warm spell.
Contributing Factors
6
No rain since August 9 (5.0mm), with three exceptionally warm and dry days (Aug 11–13) providing excellent drying conditions for non-porous rock.
Temperatures reached 22–24°C with humidity as low as 55% on Aug 12–13, driving rapid evaporation of surface moisture.
Humidity has risen to 87% today with temperatures dropping to 17.9°C, suggesting a moist air mass that could leave condensation on shaded rock faces.
Nearly 48mm of rain over the past 28 days with repeated wet spells means groundwater levels are high, potentially sustaining seepage lines on the north crag.
The north-facing elements of the crag receive minimal direct sunlight, meaning sheltered sections dry more slowly than the weather data alone would suggest.
Consistent winds of 14–35 km/h throughout the drying period help evaporate surface moisture on the exposed faces.
Recommendations
3
- Arrive in the afternoon to benefit from the west-facing aspect catching direct sun, which will help dry any residual condensation from the morning.
- Visually inspect the north crag seepage lines before committing to routes there — the south crag and main buttress are more likely to be fully dry.
- Be prepared for deteriorating conditions from August 17 onward, as significant rain is forecast; today and tomorrow offer the best remaining window.
Previous Analyses
Likely Safe to Climb
85%
2 days ago
Castle Rock of Triermain has had four consecutive dry days following a period of intermittent light rain, with today warm (23°C), breezy, and dry — the non-porous BVS rock should be thoroughly dry on most routes. This is the best weather window before a deteriorating forecast from tomorrow onwards; climb today if possible.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag has known seepage lines that can persist for days after heavy rain; the recent scattered showers (5.7mm over the past week) are unlikely to sustain these, but check seepage areas on arrival.
- The W/NW aspect means the crag catches afternoon sun from roughly midday — today's cloud cover is variable but temperatures are high enough for excellent drying regardless.
- Peregrine nesting restrictions may still be in effect into August at some Lake District crags; check the BMC RAD for current status before visiting.
- The forecast shows rain returning tomorrow (3.4mm) and a significant dump on Aug 17 (18.1mm), so today represents a narrow dry window — plan accordingly.
Warnings
1
- Rain is forecast from tomorrow afternoon — do not rely on extending this window into Aug 14.
Reasoning
Four consecutive dry days with moderate wind and warm temperatures (up to 23°C today) will have fully dried the non-porous volcanic rock surface; prior rain was light and scattered rather than sustained.
Persistent SW/W winds of 14–32 km/h over the dry period, combined with afternoon sun on the W/NW aspect and summer warmth, provide excellent drying conditions for this rock type.
BVS rhyolite is non-porous and does not suffer structural weakening when wet; there is no hold-breakage risk from the recent light precipitation.
Mid-August offers long daylight hours and warm temperatures; no freeze-thaw concern; this is peak summer climbing season in the Lakes.
Contributing Factors
6
No measurable rain since Aug 9 (5.0mm), giving the non-porous rock ample time to shed all surface moisture.
Peak of 23°C with moderate wind accelerates evaporation of any residual dampness.
Winds of 15–30 km/h from the SW over recent days have promoted rapid surface drying on this partially exposed crag.
Intermittent light rain over the past two weeks (47.7mm in 28 days) is modest for the Lake District and unlikely to sustain seepage lines given the dry spell.
3.4mm expected tomorrow with further rain through the week, closing this dry window.
Humidity climbs above 85% from 8pm onwards, potentially causing condensation on rock surfaces in the late evening.
Recommendations
3
- Climb today — this is the best window before rain returns tomorrow; aim for the afternoon when the W/NW aspect catches direct sun.
- Check seepage lines on the north crag before committing to routes there, as residual drainage from recent showers is possible.
- Verify peregrine nesting restrictions via the BMC RAD before visiting, as seasonal closures may still apply in August.
Likely Safe to Climb
85%
3 days ago
Castle Rock of Triermain has had three consecutive dry days with today being warm (22°C+), breezy, and low humidity — excellent drying conditions for non-porous BVS rock. The west-facing aspect is catching afternoon sun and the strong southerly wind will have thoroughly dried surface moisture; conditions should be good for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag has persistent seepage lines after heavy rain — the wet spell from late July through early August (nearly 48mm over 28 days) means some seepage may linger on the north crag despite three dry days.
- The W/NW aspect means morning shade and slower initial drying, but the strong southerly winds today (up to 34 km/h) compensate well for the limited morning sun.
- Peregrine nesting restrictions may still apply in early August — check the BMC RAD for current seasonal access information before visiting.
- Cloud cover is forecast at ~100% for much of today, reducing direct solar drying, but the warm temperatures (20–22°C) and steady wind provide effective evaporative drying regardless.
Warnings
1
- Some seepage lines on the north crag may still be active after the extended wet period — avoid routes crossing known seepage features if damp.
Reasoning
Three full dry days since the last rain (0.7mm on Aug 7), with today's warm temperatures (22°C+), low humidity (46–59%), and strong wind providing excellent drying — surface moisture on this non-porous BVS rock should be fully evaporated.
The strong southerly wind (up to 34 km/h) and warm temperatures have driven rapid evaporative drying despite the W/NW aspect receiving limited direct morning sun; three dry days is more than adequate for non-porous volcanic rock.
BVS rhyolite is non-porous and does not suffer structural weakening when wet — no hold breakage risk from the recent wet spell.
Mid-summer conditions with long daylight hours and warm temperatures are ideal; no freeze-thaw concerns at 300m in August.
Contributing Factors
5
No precipitation since August 10, giving ample time for this non-porous rock to shed surface moisture completely.
Today's 22°C+ temperatures and humidity dropping to 46% create excellent evaporative drying conditions.
Sustained winds of 20–34 km/h from the south provide effective air movement across the W/NW-facing crag, accelerating surface drying.
Nearly 48mm of rain over the past 28 days with multiple wet episodes could sustain deeper seepage lines on the north crag despite surface drying.
Cloud cover is ~100% for much of the day limiting direct solar heating, but wind and temperature compensate adequately.
Recommendations
3
- Climb this afternoon to maximise drying time and catch any breaks in cloud for direct sun on the west-facing rock.
- Inspect the north crag seepage lines carefully before committing — choose south crag or main buttress routes if seepage is visible.
- Check the BMC RAD for any active peregrine nesting restrictions before visiting.
Marginal — Assess Conditions
65%
5 days ago
Castle Rock received nearly 5mm of rain yesterday (Aug 9) and has had a persistently wet fortnight, but today is dry with humidity dropping into the mid-60s by afternoon and light winds; the non-porous BVS rock should be surface-dry on exposed faces by early afternoon, though seepage lines on the north crag may still be running. Tomorrow and the following days look significantly better as a warm, dry spell moves in.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines are likely still active after 25mm of rain in the past week — avoid routes crossing these until they visibly dry.
- The W/NW aspect means the crag won't receive direct sun until early-to-mid afternoon today, delaying surface drying compared to south-facing venues.
- Overnight humidity was near saturation (96–98%) so condensation or dew is likely on the rock this morning; wait until afternoon for reliable friction.
- Peregrine nesting restrictions may still be in effect — check the BMC RAD for current status before visiting.
Warnings
2
- Check BMC RAD for any active peregrine nesting restrictions before visiting.
- Seepage lines on the north crag may remain wet and slippery even when surrounding rock appears dry — test friction carefully.
Reasoning
4.9mm fell yesterday with high humidity (89%), and the rock has had only one dry day with very high overnight humidity (96–98%), meaning surfaces likely carried condensation this morning and may still have residual dampness in sheltered areas.
Today's westerly wind at ~10–14 km/h combined with humidity dropping to 64% by late afternoon should dry exposed surfaces within a few hours of any sun reaching the W/NW-facing rock, but sheltered recesses and seepage lines will lag significantly.
BVS rhyolite is non-porous and suffers no structural weakening when wet; the only risk is reduced friction on damp surfaces.
Mid-summer conditions mean long daylight hours and reasonable temperatures, but the recent unsettled spell with persistent westerly rain has kept the crag wet for much of the past two weeks.
Contributing Factors
6
4.9mm fell on Aug 9 with only one dry day since, following a prolonged wet spell totalling 25mm over seven days.
Humidity drops to 64% by mid-afternoon with light winds and some sun breaks on the W/NW face, allowing exposed surfaces to dry.
Humidity reached 96–98% overnight, likely depositing condensation on the rock that will take hours to clear.
BVS rhyolite does not absorb water so dries relatively quickly once conditions allow surface evaporation.
Nearly 48mm of rain in the past 28 days means seepage lines, particularly on the north crag, are likely still running.
Three consecutive dry days from tomorrow with temperatures reaching 20–25°C and lower humidity will rapidly improve conditions.
Recommendations
3
- If climbing today, wait until mid-afternoon (after 14:00) when the W/NW face has had direct sun and humidity is at its lowest, and visually inspect holds for dampness before committing.
- Avoid seepage-prone routes on the north crag today; focus on well-exposed lines on the main buttress that catch afternoon sun and wind.
- Tomorrow (Aug 11) onwards offers a much better window — consider waiting a day for significantly improved conditions with warmer temperatures and lower humidity.
Do Not Climb
45%
5 days ago
Castle Rock received 3.6mm of rain today following a prolonged wet spell (24.5mm in the last 7 days), and with high humidity (88%) and a W/NW aspect that limits drying, the rock surfaces are very likely still damp. Although rhyolite does not suffer structural damage, friction will be severely compromised on wet surfaces, making the steep routes here dangerous.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively weeping after this extended wet period — expect persistent dampness on routes like North Crag Eliminate for at least 24 hours after the last rain.
- The W/NW aspect means the crag receives no direct sun until the afternoon, so morning visits will find slower drying conditions, particularly in the shaded gullies and north-facing sections.
- Check for peregrine nesting restrictions before visiting — spring restrictions can sometimes extend into early summer and may close sections of the crag.
- The steep, overhanging nature of classic routes like Overhanging Bastion means some protected faces may actually be drier than the slabbier lines, but seepage from above can still affect holds unpredictably.
Warnings
2
- Friction on wet BVS rhyolite is dramatically reduced — do not attempt friction-dependent slab moves or bold routes until surfaces are genuinely dry.
- Seepage lines on the north crag may persist for days after the extended wet spell; these can wet holds unexpectedly mid-route.
Reasoning
With 3.6mm of rain today on top of a very wet preceding fortnight (24.5mm in 7 days, 46.3mm in 28 days), the rock surfaces and seepage lines will be actively wet, with humidity at 88% inhibiting evaporation.
The W/NW aspect receives no morning sun and only limited afternoon sun in the current overcast, unsettled pattern; moderate SW winds (28 km/h) provide some drying but humidity is too high for effective evaporation today.
Borrowdale Volcanic rhyolite is non-porous and faces no structural risk from moisture — the concern is purely friction loss on the crystalline surface when wet.
Mid-summer should offer the best drying conditions, but the current spell is unusually cool and wet for August (averaging only 12.2°C over the past week), significantly slowing what would normally be rapid surface drying.
Contributing Factors
6
3.6mm fell today with 24.5mm over the past 7 days and zero consecutive dry days, meaning rock surfaces and seepage lines are saturated.
Humidity at 88% today and averaging 85% over the past week severely impedes surface evaporation even in moderate wind.
The crag misses direct sun until afternoon, and with overcast skies during this unsettled spell, solar drying has been minimal.
SW winds at 28 km/h provide some air movement across the face, aiding surface drying once rain stops.
BVS rhyolite does not absorb water so surface moisture can evaporate quickly once conditions improve, without extended internal drying.
Average of 12.2°C over the past week is well below summer norms, reducing evaporation rates and extending drying times.
Recommendations
3
- Wait at least one full dry day with lower humidity before attempting routes — tomorrow (Aug 10) looks promising but assess conditions on arrival.
- Prioritise steep, overhanging routes (e.g. Overhanging Bastion) which shed water more readily than slabs or grooves, but still check holds for residual seepage.
- Avoid the north crag seepage lines entirely for at least 48 hours after this wet spell; focus on the better-drained south-facing pillars if climbing at all.
Marginal — Assess Conditions
60%
6 days ago
Today is the first fully dry day after a prolonged wet spell, with only 1 consecutive dry day following nearly 21mm of rain in the past week. The W/NW aspect and moderate SW wind should help surface drying this afternoon, but seepage lines on the north crag are likely still active and humidity has been high; climbers should inspect conditions carefully on arrival before committing to routes.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines are very likely still running after the sustained wet period from late July into early August, and these can persist for days even after rain stops.
- The west-facing aspect means the crag won't receive direct sun until the afternoon, so morning visits today will find conditions significantly damper than afternoon ones.
- The prevailing SW/W winds over recent days blow directly onto this W/NW-facing crag, which aids surface drying but can also drive moisture into sheltered corners and recesses.
- Check for peregrine nesting restrictions before visiting — spring restrictions may still be formally in place or informally observed into summer; consult the BMC RAD for current status.
Warnings
2
- Significant rain (12.7mm) is forecast for tomorrow (August 9), which will reset drying progress entirely — today's afternoon window may be the only viable opportunity this week.
- Seepage lines on the north crag may still be active and could make routes there unsafe despite surface rock appearing dry elsewhere.
Reasoning
The rock surface has had only one dry day to shed moisture after repeated rain events totalling ~21mm over the past week, and background humidity remains high (71% today, averaging 83% over the last week), meaning residual dampness is likely in sheltered areas and seepage lines.
Today's SW wind at 26 km/h blowing directly onto the W/NW face will accelerate surface evaporation, and afternoon sun on the west aspect should help, but one day is marginal for clearing seepage lines after this volume of rain.
Borrowdale Volcanic Series rhyolite is non-porous and does not suffer structural weakening when wet, so hold breakage is not a concern.
Mid-summer temperatures and daylight hours are favourable for drying, though the recent spell has been unusually cool (averaging only 12.3°C over the past week), which slows evaporation rates compared to typical August conditions.
Contributing Factors
7
Approximately 21mm of rain fell over the past 7 days across multiple events from July 31 to August 7, with very few dry breaks, keeping the crag consistently damp.
A single dry day is marginal for clearing seepage lines and sheltered damp patches on a W/NW-facing crag at 300m, even on non-porous rock.
Humidity has averaged 83% over the past week and remains at 71% today, slowing evaporation and potentially leaving a film of moisture on the rock surface.
The 26 km/h SW wind blows directly onto the W/NW face, actively stripping surface moisture and accelerating drying on exposed sections.
The west-facing aspect will receive direct afternoon sun today, which combined with wind should dry exposed surfaces by mid-to-late afternoon.
The 7-day average of 12.3°C is well below typical August temperatures for the Lakes, reducing evaporation efficiency.
BVS rhyolite does not absorb water, so drying is purely a surface phenomenon and conditions can improve rapidly once rain stops and wind/sun arrive.
Recommendations
3
- Visit in the afternoon to maximise the benefit of direct sun on the west-facing aspect and allow the morning's residual dampness to evaporate.
- Inspect seepage lines on the north crag carefully before committing — consider sticking to the main south-facing buttress if the north crag is still weeping.
- Carry a towel and be prepared to retreat if friction feels compromised; the steep nature of routes like Overhanging Bastion makes damp friction particularly dangerous.
Do Not Climb
30%
7 days ago
Castle Rock of Triermain has been subjected to a prolonged wet spell with rain on most days over the past two weeks, and today has seen further light rain with very high humidity. Although the rock is non-porous, persistent seepage lines on the north crag and saturated surroundings mean surfaces are likely damp, and conditions are not suitable for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively running after this prolonged wet period, and these can persist for days even after rain stops.
- The W/NW aspect means the crag misses morning sun entirely and only catches afternoon light, which has been largely obscured by cloud cover during this unsettled spell.
- Humidity has been consistently above 85% for the past week, severely limiting evaporative drying even on this non-porous rock.
- Peregrine nesting restrictions should be checked before visiting, though by early August most restrictions will have been lifted.
Warnings
2
- Friction on BVS rock is dramatically reduced when damp — even a thin moisture film can make steep routes dangerously slippery, particularly on the classic E1/E2 lines.
- Seepage lines on the north crag may not be visible from the ground but can soak holds mid-route — retreat from steep ground when damp is dangerous.
Reasoning
With 1.2mm of rain today, 2.5mm yesterday, and 24mm in the past week at persistently high humidity (86% average), rock surfaces will be wet or damp across most of the crag.
Despite moderate westerly winds providing some air movement, the combination of continued precipitation, very high humidity, and limited direct sun on this W/NW-facing crag means meaningful drying has not occurred.
Borrowdale Volcanic Series rhyolite is non-porous and suffers no structural weakening when wet, so hold breakage is not a concern.
Mid-summer should offer the best drying conditions, but this August has been unusually cool and wet with temperatures well below seasonal averages, mimicking autumn conditions.
Contributing Factors
7
Rain has fallen on 8 of the last 10 days totalling over 24mm, keeping the crag and surrounding rock saturated.
Average humidity of 86% over the past week severely inhibits evaporative drying of surface moisture.
1.2mm of precipitation today means rock surfaces are currently wet or freshly dampened.
Westerly winds around 28 km/h provide some surface drying effect, though insufficient to overcome the persistent moisture input.
BVS rhyolite does not absorb water, so once rain stops and conditions improve, surface drying can occur within hours.
Temperatures around 12°C are well below summer norms for the Lakes, reducing the rate of evaporation.
The crag only receives afternoon sun, and overcast skies during this unsettled period have further reduced solar drying.
Recommendations
3
- Wait for a sustained dry spell of at least 24 hours with dropping humidity before visiting, as the prolonged wet period means seepage lines will take longer than usual to dry.
- If visiting tomorrow (Aug 8), which shows only trace precipitation, arrive in the afternoon to benefit from any available westerly sun and check seepage lines carefully before committing to routes.
- Avoid the north crag entirely until several dry days have passed, as its seepage lines will be actively running.
Do Not Climb
35%
9 days ago
Castle Rock of Triermain has been subjected to a prolonged wet spell with nearly 29mm in the last 7 days and rain continuing through this morning; combined with very high humidity (86% average) and cool temperatures, the rock is unlikely to be reliably dry today. While the afternoon looks rain-free with moderate wind, residual surface moisture and active seepage lines make friction-dependent climbing inadvisable.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively running after the sustained wet period of the last 10+ days, and these can persist for days even after rain stops.
- The W/NW aspect means the crag receives no direct sun until afternoon, significantly slowing morning drying — today's 100% cloud cover eliminates even that advantage.
- Castle Rock sits in St John's in the Vale where valley-level cloud and mist can linger, and at 300m the crag may have been in cloud for much of the recent wet spell given humidity near 100%.
- Peregrine nesting restrictions may still be in effect in early August — check the BMC RAD or local notices before approaching.
Warnings
2
- Friction on BVS rhyolite is dramatically reduced when damp — routes that feel secure in dry conditions can become dangerously slippery, particularly on the steep lines Castle Rock is known for.
- Seepage lines on the north crag may persist for several days after this prolonged wet period; do not assume dry weather means dry rock.
Reasoning
Rain fell through this morning until at least 11:00, following a week of repeated rainfall totalling ~29mm with ambient humidity consistently above 85%, meaning the rock surface is currently wet and seepage lines are fully charged.
The afternoon window from ~13:00 onwards is dry with moderate W wind (~20 km/h) which will begin surface drying, but with 100% cloud cover, no direct sun, and humidity remaining 72–84%, full surface drying on this NW-facing crag is unlikely within today.
Borrowdale Volcanic rhyolite is non-porous and suffers no structural weakening when wet — the risk is purely friction loss on damp surfaces.
Mid-summer provides the longest possible drying windows and warmest temperatures, but the current spell is unusually cool (11–13°C) and wet for August, limiting the seasonal advantage.
Contributing Factors
6
Nearly 29mm fell in the last 7 days across multiple days, with rain on 6 of the last 7 days keeping the crag persistently damp and seepage lines active.
Light but persistent rain fell from 02:00 to 11:00 today, totalling ~4mm and re-wetting any surfaces that may have begun drying.
Humidity has averaged 86% over the past week and remains 72–84% this afternoon, severely impeding evaporative drying on the rock surface.
Sustained W/SW winds of 19–23 km/h this afternoon will aid surface drying on this partially exposed crag.
Cloud cover is 86–100% throughout the day, eliminating solar heating which would otherwise help the W-facing aspect dry through the afternoon.
A maximum of only 11.4°C is unusually cool for early August and slows evaporation compared to typical summer conditions.
Recommendations
3
- Do not climb today — the rock is likely still damp from this morning's rain and the prolonged wet spell, with inadequate drying conditions.
- If visiting tomorrow (Aug 7), go late in the day and visually check for seepage and damp patches, especially on the north crag; be prepared to walk away.
- Monitor conditions for Aug 11 onwards when a dry spell with warmer temperatures and lower humidity may finally allow proper drying.
Do Not Climb
85%
11 days ago
Castle Rock is currently wet from ongoing intermittent rain today (6.5mm, with a heavy 3.4mm burst at 10:00) and extremely high humidity (90–97%), with no realistic drying window before a major 22mm storm arrives tomorrow. The past week has been persistently damp with nearly 16mm of rain across multiple days, and the crag will remain wet through the coming unsettled spell.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north crag's known seepage lines will be actively running given the cumulative 16mm over the past week and today's additional 6.5mm, making routes there particularly hazardous.
- The W/NW aspect means the crag is fully exposed to the prevailing SW/W winds bringing the current frontal systems, so rain is hitting the rock face directly rather than being sheltered.
- Peregrine nesting restrictions should be checked before any visit — though conditions currently preclude climbing, restrictions may still be in force in early August at this venue.
- The afternoon sun that normally aids drying on this west-facing crag is entirely blocked by persistent 90–100% cloud cover, eliminating the crag's main drying advantage.
Warnings
3
- Friction on BVS rhyolite is severely reduced when wet — steep routes like Overhanging Bastion and North Crag Eliminate become extremely dangerous in these conditions.
- Tomorrow's 22mm storm with 37 km/h winds will create hazardous approach and crag-base conditions including potential rockfall from saturated ground above.
- Seepage lines on the north crag will be actively running and may take 24–48 hours of dry weather to subside.
Reasoning
The rock is currently wet from today's rain (6.5mm total, including a 3.4mm burst at 10:00) compounded by near-saturation humidity of 90–97% throughout the day, with no meaningful dry spell to allow surface evaporation.
Despite moderate winds (19–27 km/h), the 100% cloud cover, extremely high humidity, and W/NW aspect receiving no direct sun mean surface moisture cannot evaporate effectively — and tomorrow's 22mm deluge will re-soak everything before any drying can occur.
Borrowdale Volcanic Series rhyolite is non-porous and not at risk of structural damage, but friction is severely compromised on the currently wet crystalline surface, making steep trad routes like Overhanging Bastion genuinely dangerous.
Mid-summer temperatures are mild (12–16°C at 300m) but well below seasonal norms, and the current Atlantic-driven unsettled pattern shows no sign of breaking until at least August 7th.
Contributing Factors
6
6.5mm of intermittent rain today including a heavy 3.4mm burst at 10:00, with trace amounts continuing into the afternoon, leaves the rock surface actively wet.
Humidity has been 85–97% throughout today with 100% cloud cover, preventing any meaningful surface evaporation even during brief dry spells.
Tomorrow's forecast of 22.2mm with 37 km/h winds and 99% humidity will thoroughly re-soak the entire crag, resetting any drying progress.
Nearly 16mm over the past 7 days across multiple rain events means seepage lines on the north crag are likely active and ground saturation is high.
Winds of 19–27 km/h today provide some airflow across the face that would assist drying if rain and humidity were to abate.
Persistent 90–100% cloud cover throughout the day eliminates the afternoon sun that the west-facing aspect normally benefits from.
Recommendations
3
- Do not visit today or tomorrow — the rock is wet now and a 22mm storm is forecast for August 5th, making conditions dangerous on steep trad routes.
- The earliest realistic window is August 7th, the only forecast dry day, but check conditions carefully as residual seepage may persist on the north crag.
- Consider lower-commitment alternatives with quick drying times if desperate to climb this week, but the overall outlook is poor through August 9th.
Marginal — Assess Conditions
60%
12 days ago
After a prolonged wet spell (13mm in the last week), light morning showers are clearing and a dry, warm afternoon window is forecast from midday with dropping humidity and SE winds — conditions should allow the non-porous BVS rock to dry sufficiently for an afternoon session, but visual confirmation on arrival is essential. Heavy rain is forecast from tomorrow through at least Aug 6, so today's afternoon window may be the last reasonable opportunity for several days.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Seepage lines on the North Crag are likely still active after the sustained wet period from July 25–Aug 1 (25mm+ over that spell), so routes on the north crag may have persistent damp streaks even when the main faces feel dry.
- The W/NW aspect means today's SE wind blows directly onto the face, aiding surface drying — an unusually favourable wind direction for this crag.
- Peregrine nesting restrictions may still be in effect in early August — check the BMC RAD for current status before committing to the approach.
- The afternoon sun window (W-facing aspect catching sun from early-mid afternoon) coincides neatly with the driest forecast hours today (14:00–17:00), giving the best possible drying conditions.
Warnings
2
- Heavy rain is forecast from tomorrow (Aug 4) through Aug 6 with 30mm+ expected — conditions will deteriorate sharply and today's afternoon may be the last viable window for several days.
- Seepage lines on the North Crag are likely active and could make routes there dangerously slippery even when the main face appears dry.
Reasoning
Light scattered showers totalling ~1.4mm fell through the early hours today, on top of a wet week (13.3mm in 7 days with humidity averaging 85%), so surfaces will be damp this morning but the non-porous BVS rock does not retain internal moisture.
SE winds at 18–22 km/h blowing directly onto the W/NW face, combined with afternoon sun, dropping humidity (to 50% by 16:00), and temperatures reaching 20°C should dry surface moisture within 2–3 hours of the last shower (~08:00), making an afternoon session viable.
Borrowdale Volcanic Series rhyolite is non-porous and does not suffer structural weakening when wet; no hold breakage risk from the recent rainfall.
Mid-summer conditions with long daylight hours and reasonable temperatures favour drying, though this has been an unusually cool and wet spell for August in the Lakes.
Contributing Factors
6
Over 13mm fell in the last 7 days across multiple days (Jul 25–Aug 1), maintaining high ambient moisture and feeding seepage lines.
Light but persistent drizzle through the early hours (totalling ~1.4mm) means surfaces will be damp through late morning.
Dry conditions forecast from ~10:00 onwards with humidity dropping to 50%, temperatures reaching 20°C, and clearing skies by mid-afternoon.
SE wind at 18–22 km/h blows directly onto the W/NW face, significantly aiding surface evaporation.
Average humidity over the last week has been 85%, and overnight humidity remains high, slowing overnight drying.
BVS rhyolite does not absorb water, so only surface moisture needs to evaporate — no extended drying period required.
Recommendations
3
- Aim for an afternoon session between 14:00–18:00 when humidity is lowest and afternoon sun reaches the west-facing rock — touch-test holds on easier ground before committing to harder routes.
- Avoid the North Crag seepage lines entirely today; focus on the main buttress routes which will dry fastest in the afternoon sun and wind.
- Check the BMC RAD for any active peregrine nesting restrictions before setting out, and carry waterproofs for the walk-in given the unsettled pattern.
Climbing Outlook