Condition Analysis
AI-powered assessment using site data and 14-day weather history
Parisella's Cave is in excellent condition today following 8 consecutive dry days and relatively low recent humidity. Tomorrow and the day after look good with humidity around 70–73%, but conditions will deteriorate significantly from August 18th with heavy rain and high humidity forecast.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides full rain shelter, but the sea-cave environment means ambient humidity from the Irish Sea can make limestone holds greasy even on dry days.
- Tidal access should be checked — Parisella's Cave is a sea-level venue on the Great Orme and some approaches may be affected by high tides.
- The predominantly overhanging nature of the climbing means seepage is rarely an issue, but condensation on pocketed limestone can accumulate in humid maritime conditions.
- The north-facing aspect means no direct sun reaches the rock to assist drying or warming, so friction is entirely dependent on low ambient humidity.
Warnings
2
- Today's 81% humidity may cause greasy conditions on slopers and polished holds — be prepared for reduced friction despite dry rock.
- Significant rain and very high humidity (88%) forecast from August 18th will make limestone extremely slippery.
Reasoning
Eight consecutive dry days with only trace precipitation in the last week and humidity averaging 67% means the rock surface should be thoroughly dry and free of any residual moisture.
Despite the sheltered, north-facing aspect limiting direct sun and airflow, the extended dry spell and moderate westerly winds have provided ample drying time for the limestone surfaces.
Limestone is not structurally weakened by moisture, so there is no hold-breakage concern; the primary risk is surface friction loss from humidity.
Mid-summer conditions are generally favourable, though today's 81% humidity is on the high side — the forecast drop to 70% tomorrow will improve friction noticeably.
Contributing Factors
6
Eight consecutive dry days with negligible precipitation in the past week ensures no residual surface moisture on the limestone.
Today's 81% humidity is high enough to make limestone feels noticeably greasy, particularly on polished holds and slopers.
The cave roof eliminates direct rain exposure, and the recent dry spell means no seepage is active through the limestone above.
Proximity to the Irish Sea means humidity can spike quickly and salt-laden air contributes to a greasy feel on holds.
Heavy rain forecast from August 18th (4.7mm + 6.4mm) combined with 88% humidity will make conditions poor later in the week.
Humidity forecast to drop to 70% tomorrow with a NW breeze, which should provide noticeably better friction than today.
Recommendations
3
- Visit tomorrow (Aug 15) or the day after for the best friction window before conditions deteriorate later in the week.
- Bring a towel and brush — even in good conditions, pockets can accumulate condensation in this sea-cave environment.
- Check tide times before visiting as access to the cave can be affected at high tide.
Previous Analyses
Likely Safe to Climb
82%
2 days ago
Parisella's Cave is in excellent condition today — seven consecutive dry days, relatively low humidity (57–70% through the climbing hours), and the rock should offer good friction. This is a strong window before rain arrives tomorrow.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides complete rain shelter, but being a sea cave on the Great Orme, humidity off the Irish Sea can cause greasy limestone even on nominally dry days — friction is humidity-dependent here more than at inland venues.
- Pockets and tufas inside the cave can hold residual moisture from seepage through the headland above, particularly after prolonged wet spells; check holds by touch before committing to harder problems.
- Tidal access is not normally an issue at Parisella's but sea spray in strong onshore winds (especially NW–N) can drift into the cave and dampen lower problems.
- The cave is north-facing and sheltered, so any moisture that does enter takes longer to evaporate — but the current 7-day dry spell and moderate humidity mean this is not a concern today.
Warnings
1
- Rain forecast tomorrow (5.7mm) and a significant storm on the 17th (22.2mm, 90% humidity) — conditions will deteriorate sharply; plan sessions accordingly.
Reasoning
Seven consecutive dry days with only trace precipitation in the past fortnight mean the rock surface and pockets should be thoroughly dry, with no seepage concerns.
Despite the sheltered, north-facing aspect that slows drying, the extended dry spell and moderate westerly winds have provided ample time for any residual moisture to dissipate.
Limestone is not structurally weakened by moisture, so there is no hold-breakage risk from recent conditions.
Mid-summer provides the longest drying days and warmest temperatures, and current conditions (mid-60s humidity, ~20°C) are near-ideal for limestone friction at this coastal venue.
Contributing Factors
6
Seven consecutive dry days with only 0.0mm in the past week ensures the rock is thoroughly dry.
Humidity ranges from 57–70% through the core climbing hours (morning to late afternoon), which is acceptable for limestone friction at this venue.
Humidity climbs above 75% after 20:00 and reaches 86% by midnight, which will make the limestone noticeably greasier in the evening.
The cave roof means the rock stays dry even if unexpected showers arrive, though humidity effects still apply.
5.7mm forecast for August 14th with 79% humidity will degrade conditions and may introduce seepage in the following days.
The sheltered north-facing position is largely irrelevant today given the prolonged dry spell, but will slow recovery after tomorrow's rain.
Recommendations
3
- Climb today — this is the best window before rain arrives tomorrow; aim for morning through mid-afternoon when humidity is lowest (57–66%).
- Avoid evening sessions after 20:00 as humidity rises above 75% and limestone friction will deteriorate noticeably.
- Check deeper pockets and tufa features by touch before pulling on them, as residual seepage can linger even in dry spells.
Likely Safe to Climb
88%
3 days ago
Parisella's Cave is in excellent condition today — six consecutive dry days, low humidity (49–58% through the afternoon), and the cave's sheltered roof means no direct wetting concerns. This is about as good as summer limestone friction gets at this venue.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides complete rain shelter, but being a sea cave on the Great Orme, sea spray and coastal humidity can still affect friction on holds even on nominally dry days.
- Pockets and tufa features deep in the cave can retain seepage moisture from the limestone above, particularly after the small rain events on Aug 4–6; check key holds before committing to hard moves.
- The north-facing aspect and sheltered position mean the cave rarely gets direct sun, so ambient humidity is the primary driver of friction quality rather than surface drying from rain.
- Tidal conditions should be checked before visiting — at very high tides access along the base of the headland can be affected, and sea spray may reach the cave mouth.
Warnings
1
- Check tide times before visiting — high tides can restrict access along the base of the Great Orme to the cave.
Reasoning
Six dry days and today's humidity dropping to 49–54% in the afternoon mean the rock surface should be genuinely dry with good friction.
The minor rain on Aug 4–6 (total ~6mm) has had six full days to clear, and the cave roof shields the climbing surface from direct wetting, so any residual moisture is negligible.
Limestone does not suffer structural weakening from moisture; hold integrity is not a concern.
Mid-summer conditions with long daylight hours and moderate temperatures are ideal for this venue; today's warmth (25°C) is manageable inside the shaded cave.
Contributing Factors
5
No rainfall since Aug 6, giving ample time for any residual moisture in pockets and seepage lines to clear.
Humidity dropping to 49–54% through the afternoon is unusually low for this coastal venue and will provide excellent friction on the limestone.
The cave roof completely shields the climbing surface from direct rain, meaning the rock has not been wetted even during recent light showers.
The sheltered, north-facing cave lacks direct sun for drying, but with six dry days and low humidity this is not a concern today.
At 25°C the cave interior may feel warm, but the shade and low humidity offset any sweaty-hands issues for most climbers.
Recommendations
3
- Climb this afternoon for the best friction window — humidity is lowest between 13:00 and 17:00 (49–52%).
- Check tufa and pocket holds for residual seepage before committing to hard problems, especially deeper in the cave.
- Conditions deteriorate from tomorrow — rain forecast on Aug 14 and 16–17 with rising humidity, so today is the best day this week.
Likely Safe to Climb
82%
5 days ago
Parisella's Cave is in good condition today — no rain for 4 days, humidity dropping into the low 60s this afternoon, and the cave roof eliminates direct wetting concerns. The best friction window is midday to early evening when humidity is at its lowest.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides complete rain shelter, but the enclosed environment can trap humid sea air, making friction noticeably worse on muggy days even when it hasn't rained.
- North-facing aspect means no direct sun reaches the rock to warm it; conditions rely entirely on ambient humidity and airflow rather than solar drying.
- Being a sea cave on the Great Orme headland, onshore winds (N/NW) can carry salt moisture into the cave, while offshore winds (S/SE) tend to bring drier air to the rock surface.
- Tufas and deep pockets in the cave can retain condensation in high humidity — test key holds for greasiness before committing to hard moves.
Reasoning
No significant rain in the past 4 days (last notable event was 3.9mm on Aug 4), and the cave roof means the rock has not been directly wetted; current humidity of 60–68% is acceptable for limestone friction.
The sheltered, north-facing cave gains little benefit from wind or sun for drying, but with no direct wetting and humidity in the mid-60s today, surface conditions should be adequately dry.
Limestone does not suffer structural weakening from moisture; the primary risk is reduced friction on greasy holds, which is manageable at today's humidity levels.
Mid-summer conditions are generally favourable, though August sea breezes can elevate coastal humidity; today's northerly wind is moderate and humidity is within acceptable range.
Contributing Factors
5
Four consecutive dry days and the cave roof has kept the rock surface free from direct wetting throughout the recent light showers.
Humidity dipping below 65% this afternoon provides a good friction window for steep limestone.
The cave's sheltered, sunless aspect means drying relies on ambient conditions rather than solar warming, but today's low humidity compensates.
A light northerly onshore breeze may carry some marine moisture into the cave, slightly offsetting the low ambient humidity.
Humidity is forecast to climb to 82–86% by Aug 13–14, which will make limestone very greasy.
Recommendations
3
- Target the midday-to-early-evening window (11:00–18:00) when humidity is forecast at 59–64% for the best friction.
- Test holds for greasiness before attempting limit problems — tufas and pockets can harbour condensation even on otherwise good days.
- Plan sessions for today and tomorrow (Aug 11, humidity ~63%) as conditions deteriorate significantly from Aug 13 onwards.
Marginal — Assess Conditions
70%
5 days ago
Parisella's Cave is sheltered from rain and has been essentially dry for three days, with no forecast precipitation. However, humidity is moderate today (69%) and set to climb significantly mid-week (up to 90%), which will make the limestone greasy — friction-sensitive problems may feel compromised even though the rock is structurally unaffected.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof keeps direct rain off the rock, but the enclosed, sheltered, north-facing environment traps humid air, amplifying the greasiness effect of high humidity on limestone.
- Sea-level coastal position on the Great Orme means humidity is strongly influenced by onshore winds and sea mist — conditions can change rapidly within the cave.
- Pockets, tufas, and crimps characteristic of Parisella's retain condensation and can feel slick even when no rain has fallen, particularly above ~75% humidity.
- The predominantly hard grade range (6c–8b+) demands excellent friction; marginal conditions that might be tolerable on easier rock become a genuine safety issue here.
Warnings
2
- Limestone at 90% humidity (forecast 13 Aug) will be dangerously greasy — do not attempt hard problems in these conditions.
- Sea mist or haar can roll in quickly on the Great Orme coast, spiking local humidity well beyond forecast values with little warning.
Reasoning
No significant rain in the last three days and only trace amounts (6.6mm total in the past week), so direct surface moisture is not a concern — the cave roof has kept the rock dry from rainfall.
The sheltered, north-facing aspect limits sun-driven evaporation, but with three fully dry days and moderate wind, any residual surface moisture from the 6 Aug shower will have dissipated; the main concern shifts from drying to ambient humidity.
Limestone is non-porous and not at risk of structural damage from the minimal recent rainfall; hold integrity is not a concern.
Mid-summer conditions are generally favourable, but the forecast shows humidity climbing sharply from 68% tomorrow to 90% by 13 Aug, which will progressively degrade friction on limestone.
Contributing Factors
6
Only trace precipitation in the last three days (0mm today, 0mm yesterday, 1.8mm on 6 Aug) and the cave roof shelters the climbing surface from direct wetting.
The large roof means climbing surfaces remain dry even during showers, making direct wetting a non-issue.
Today's 69% humidity is acceptable for limestone friction but sits at the threshold where conditions become noticeably less positive.
Humidity is forecast to climb from 68% tomorrow to 75% on the 11th, 81% on the 12th, and 90% on the 13th, which will make limestone holds progressively greasier.
The enclosed cave traps humid air and receives no direct sunlight, meaning ambient moisture lingers and condensation is more likely than at open, sun-exposed crags.
Wind drops from 25 km/h today to 13–15 km/h by mid-week, reducing air circulation in the cave and exacerbating humidity effects.
Recommendations
3
- Tomorrow (10 Aug) offers the best window — coolest day (17.5°C) with the lowest forecast humidity (68%) and a northerly breeze; prioritise this day if possible.
- Bring a towel and brush, and test friction on a familiar easy problem before committing to harder lines — if holds feel slick or glassy, conditions are too humid.
- Avoid climbing on 13 Aug when humidity is forecast at 90%; even under the cave roof the limestone will be extremely greasy and dangerous on hard problems.
Marginal — Assess Conditions
72%
6 days ago
Parisella's Cave has had no rain for 2 days and the rock is sheltered by the cave roof, so surfaces should be dry; however, humidity levels have been moderate (63–65%) and are forecast to rise, which can make the limestone greasy. Current conditions are likely acceptable but friction quality should be assessed on arrival, especially on polished holds.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides excellent rain shelter, meaning direct wetting is rarely an issue — the primary concern is always ambient humidity making limestone holds greasy.
- Being a north-facing sea cave at low altitude on the Great Orme, the venue can trap humid maritime air, and sea breezes can raise humidity rapidly even on otherwise dry days.
- Pockets and tufas inside the cave can retain condensation and seepage moisture that isn't visible until you pull on holds.
- The predominantly hard grades (Font 6c+) demand excellent friction — even modest humidity-driven greasiness can make these problems feel significantly harder and more dangerous.
Warnings
2
- Humidity is forecast to rise significantly from Aug 12 onwards (78–83%), which will make polished limestone extremely greasy and increase the risk of unexpected slips on hard moves.
- Seepage lines through the cave roof can activate after even modest rainfall — check the back wall and tufa features for damp patches before climbing.
Reasoning
No direct rain has reached the cave interior recently, and the last measurable precipitation (1.8mm on Aug 6) was light; the cave roof will have kept holds dry from rainfall, but ambient humidity at 63–65% is moderate and could leave a thin film of moisture on polished limestone.
The sheltered, north-facing aspect means minimal solar drying, but the moderate SW wind (22–23 km/h) provides some airflow; two fully dry days at 63–65% humidity should be sufficient to clear any residual surface moisture from the minor rain on Aug 6.
Limestone is non-porous so there is no structural weakening concern; the risk is purely friction-related from humidity and surface moisture.
Mid-summer conditions are generally favourable for Parisella's, though the recent pattern of moderate-to-high humidity (often 70%+) is less than ideal for limestone friction.
Contributing Factors
6
The large cave roof means direct rainfall has not wetted the climbing surfaces, even during recent showers.
Today's humidity of 65% is acceptable for limestone friction, though not ideal — the best sessions come below 60%.
Two consecutive dry days with moderate wind have allowed any residual atmospheric moisture to dissipate from the cave interior.
Humidity is forecast to climb from 72% tomorrow to 83% by Aug 13, which will progressively worsen friction on the limestone.
The north-facing, sheltered cave receives no direct sun, so any moisture or condensation on holds takes longer to evaporate.
6.7mm over the past 7 days is modest and mostly blocked by the cave roof, but could contribute to localised seepage through the limestone.
Recommendations
3
- Today (Aug 8) offers the best window this week — visit now while humidity is at 65% before the forecast rise over coming days.
- Test friction on a familiar warm-up problem before committing to hard projects; if holds feel glassy or slick, conditions are too humid.
- Bring a towel and soft brush to dry and clean holds, and consider chalking up more liberally than usual given the moderate humidity.
Marginal — Assess Conditions
72%
7 days ago
The cave roof keeps direct rain off the rock, and the last significant rain (3.9mm on Aug 4) was three days ago, but humidity levels in the 65–77% range over the coming days may cause greasy limestone friction. Conditions today (65% humidity, dry) are reasonable, but the sheltered cave environment can trap moisture-laden air, so a hands-on assessment is warranted.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Parisella's Cave is sheltered from direct rain by its roof, but the enclosed cave environment traps humid sea air, which can make the limestone greasy even on nominally dry days.
- The Great Orme headland is a coastal site where onshore winds (W, SW, NW) carry moisture-laden air directly into the cave, exacerbating humidity-related friction loss.
- Pockets and tufas in the cave can retain condensation and seepage even when the main walls feel dry — test holds at depth before committing to hard moves.
- The venue sits at just 20m on a north-facing aspect, meaning it receives virtually no direct sun to help burn off ambient moisture from the rock surface.
Warnings
1
- Limestone becomes dangerously greasy in high humidity — if holds feel slippery on warm-up problems, do not attempt hard or high boulder problems.
Reasoning
The cave roof has protected the rock from the modest recent rainfall (6.7mm over 7 days), so direct wetting is minimal, but ambient humidity averaging 68% over the past week means the limestone surface may carry a thin film of condensation.
The sheltered, north-facing cave receives no direct sun and limited airflow, so drying relies entirely on ambient conditions — today's 65% humidity and moderate SW wind offer decent but not ideal drying.
Limestone is non-porous and not at risk of structural weakening from moisture, so hold breakage is not a concern here.
Mid-summer provides the best chance of lower humidity windows, but coastal North Wales is inherently humid; current conditions are typical for August and not exceptional.
Contributing Factors
6
The cave roof has kept direct rainfall off the climbing surface despite recent showers on Aug 4–6.
Humidity has been 65–83% over recent days, and the forecast shows 68–77%, which can make limestone greasy even without rain.
Today is dry and the next five days show zero precipitation, allowing conditions to stabilise.
The north-facing cave receives no solar drying and its sheltered position traps humid air, slowing any moisture dissipation.
Prevailing W and SW winds carry moist Irish Sea air directly towards the Great Orme, elevating humidity at the cave.
Temperatures around 18–22°C are comfortable for climbing but not warm enough to dramatically reduce humidity in this coastal setting.
Recommendations
3
- Visit on the driest-feeling day — tomorrow (Aug 8, 68% humidity) looks like the best window before humidity rises later in the week.
- Test friction on easier problems before committing to hard projects; if holds feel glassy or slick, conditions are too humid for safe climbing.
- Bring a towel and chalk generously (within ethical limits) — even slight greasiness on steep pocketed limestone significantly increases the risk of unexpected slips.
Likely Safe to Climb
82%
9 days ago
Parisella's Cave is in excellent condition for climbing today: the cave roof has kept the rock dry through recent light showers, humidity is dropping through the afternoon into the high 50s, and there has been negligible meaningful rainfall. The afternoon and evening window (roughly 15:00–19:00) offers the best friction with humidity dipping below 60%.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof provides complete rain shelter, meaning the tiny amounts of recent precipitation (0.2mm today, 3.9mm on Aug 4) will not have directly wetted the climbing surfaces.
- As a sea cave on the Great Orme, ambient humidity from the Irish Sea can creep in even on nominally dry days — friction is noticeably better when humidity drops below 65%.
- The sheltered, north-facing aspect means the cave interior doesn't benefit from direct sun for drying, so any seepage or condensation lingers longer than at open crags.
- Tidal access is not typically an issue at Parisella's but climbers should be aware of sea spray in strong westerly winds, which are present today at ~30 km/h.
Reasoning
The rock inside the cave has not been directly rained on; the only moisture concern is ambient humidity, which has averaged 68% over the past week and is forecast to drop to 56–58% this afternoon.
No meaningful drying period is needed since the cave roof shelters the climbing surface; the key factor is humidity-driven greasiness, which improves significantly this afternoon with westerly winds ventilating the cave.
Limestone does not suffer structural weakening from moisture, so there is no hold-breakage concern from recent light rain.
Mid-summer conditions are generally favourable, though the coastal location keeps humidity elevated compared to inland crags; today's clearing trend is well-timed.
Contributing Factors
5
The cave roof has kept climbing surfaces dry through all recent precipitation, including the 3.9mm on August 4th.
Humidity is forecast to fall to 56–58% between 16:00–18:00, offering excellent friction for limestone.
Sustained 20–30 km/h westerly winds will help ventilate the cave and reduce ambient moisture on the rock surface.
Humidity sits around 68–70% through the morning, which may produce slightly greasy conditions on slopers and polished holds.
Only 5.1mm total in the past 7 days, spread across trace amounts, poses no seepage concern for the cave interior.
Recommendations
3
- Target the afternoon–evening window (15:00–19:00) when humidity drops below 60% for the best friction on crimps and slopers.
- Bring a towel and chalk up well if arriving in the morning when humidity is still around 70% — polished holds may feel greasy.
- Check for sea spray at the cave entrance given today's strong westerly winds; the back of the cave will be unaffected.
Marginal — Assess Conditions
60%
11 days ago
Parisella's Cave is sheltered from today's morning rain, but humidity has been high (80–89%) through the morning, which will make limestone holds greasy. Conditions should improve noticeably from mid-afternoon as humidity drops into the 60s, offering a reasonable climbing window from roughly 16:00–19:00.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof keeps rock dry from direct rain, but the enclosed sea-cave environment traps humid air, meaning friction can be poor even on rain-free days when ambient humidity exceeds ~75%.
- Being north-facing and sheltered at sea level on the Great Orme, the cave receives virtually no direct sun and limited airflow, so humidity inside the cave is often higher than the ambient reading.
- Tidal conditions and sea spray can affect the lower problems — check tide times before visiting, as high tide can make access awkward and raise local humidity further.
- Pockets and tufas characteristic of Parisella's can retain condensation in humid conditions, making individual holds feel wetter than the surrounding rock surface.
Warnings
1
- Limestone becomes dangerously slippery above ~75% humidity — if holds feel glassy, stop climbing and wait for conditions to improve rather than risk a fall.
Reasoning
No significant direct rain has reached the cave interior thanks to the roof, but ambient humidity has been 80–89% through this morning, likely leaving a greasy film on limestone holds.
The sheltered, north-facing cave receives no direct sun and limited wind penetration, so drying depends almost entirely on ambient humidity dropping — forecast shows this happening from ~16:00 today when humidity falls to the mid-60s.
Limestone does not suffer structural weakening from moisture, so hold breakage risk is not elevated by recent damp conditions.
Mid-summer provides the longest daylight hours, allowing a late-afternoon/evening session when humidity is lowest; sea-cave venues like Parisella's often see best friction on cooler, less humid summer evenings.
Contributing Factors
6
The cave roof has kept the rock surface dry from today's 2.3mm of rain and earlier showers.
Humidity exceeded 80% for much of the morning, which makes limestone extremely greasy and unsafe for hard bouldering.
Humidity is forecast to drop to 62–68% between 16:00 and 19:00, which should improve friction noticeably.
The cave's sheltered, north-facing position means humid air lingers and holds do not benefit from sun or wind drying.
Winds are picking up (27 km/h by evening) but the cave's sheltered position means little benefit from wind-driven drying inside.
Only 3.6mm in the past week with no heavy downpours, so no seepage or groundwater issues to worry about.
Recommendations
3
- Target a late-afternoon or early-evening session (16:00–19:00) when humidity is forecast to be lowest, and test friction on easier problems before committing to hard lines.
- Bring a towel and brush — even in good conditions, pockets and tufas may hold residual condensation that needs wiping.
- Check tide times before heading down; high tide can restrict access and locally raise humidity inside the cave.
Marginal — Assess Conditions
65%
12 days ago
Parisella's Cave has been largely dry for weeks and the cave roof provides rain shelter, but today's humidity is variable — excellent friction is likely during the mid-morning to mid-afternoon window (humidity 35–58%) before evening rain arrives. Humidity levels either side of this window and on coming days make conditions less certain.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The cave roof keeps the climbing surface dry even during today's forecast evening rain, but humidity within the cave can spike quickly when onshore winds push moist air in.
- Parisella's is a sea cave on the Great Orme headland; tide state and sea swell can affect access and spray levels on the lower problems — check tide times before visiting.
- North-facing aspect and sheltered position mean the cave interior rarely benefits from direct sun or wind-assisted drying, so ambient humidity is the dominant friction factor.
- Being a limestone cave with tufas and pockets, condensation can form on holds during sudden temperature drops or humidity spikes, even without rain.
Warnings
2
- Evening rain from 17:00 onward will drive humidity above 70% inside the cave — limestone will become greasy and falls on steep problems become more likely.
- Conditions are expected to deteriorate significantly from tomorrow through the week with repeated rain and elevated humidity.
Reasoning
No significant rainfall in the past 28 days (only 3.6 mm total) and the cave roof shields the rock from direct wetting, so the limestone surface should be structurally dry — friction depends almost entirely on ambient humidity.
With the sheltered, north-facing aspect, wind-assisted drying is minimal, but the prolonged dry spell means no residual moisture; today's mid-morning to mid-afternoon window shows humidity dropping to 35–58%, which should provide adequate friction on the limestone.
Limestone does not suffer structural weakening from moisture, so hold breakage risk is negligible even with today's light rain forecast.
Mid-summer conditions with warm temperatures and a long dry spell are generally favourable, though coastal humidity along the North Wales coast can fluctuate rapidly with wind direction changes.
Contributing Factors
6
Only 3.6 mm of rain in the past 28 days means no residual seepage or deep moisture in the limestone.
The cave roof protects the climbing surface from today's forecast evening rain and any passing showers.
Humidity is forecast to fall to 35–58% between 10:00 and 16:00 today, offering a good friction window on the limestone.
From 17:00 onward, rain arrives and humidity climbs above 70%, which will make the limestone greasy.
The cave's sheltered, north-facing position traps humid air and limits natural ventilation, making it sensitive to humidity spikes.
Rain is forecast on 4 of the next 5 days with humidity consistently 70–79%, suggesting deteriorating conditions this week.
Recommendations
3
- Target the window between 10:00 and 16:00 today when humidity is forecast to be at its lowest (35–58%) for the best friction.
- Check tide times and sea conditions before approaching — the cave can be affected by high tides and swell.
- Bring a towel and chalk liberally; if holds feel glassy or slick on arrival, conditions are too humid and you should wait.
Climbing Outlook