Right now

Temp13°C

Wind32 km/h

Gusts51 km/h

Humidity88.03%

Rain 48h2mm

Last rain0h ago

Assessment

2.8mm rain forecast

Wind 34 km/h, gusts 64 km/h — too windy

Good friction temperature range for rhyolite

High humidity (88.03%) — rhyolite friction compromised, particularly for bouldering

Humidity 88.03% — potential fog/cloud, rock may be damp from condensation

Windy — 32 km/h, gusts 51 km/h. Take care on exposed routes

Drying Time

7% dry · 5-10h to dry

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Sunday 6 September

Poor

Temp18°C

Rain3mm

Wind34 km/h

Gusts64 km/h

Humidity68%

2.8mm rain forecastWind 34 km/h, gusts 64 km/h — too windy

Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 13° 2mm 32 51 88.03%

09:00 14° 0.7mm 26 50 75.85%

12:00 17° dry 35 64 68.23%

15:00 19° dry 33 62 68.73%

18:00 18° dry 25 51 85.49%

21:00 16° 0.2mm 22 44 99.17%

Mon Monday 7 September

Poor

Temp14°C

Rain7mm

Wind27 km/h

Gusts53 km/h

Humidity74%

7.3mm rain forecastWindy — 27 km/h, gusts 53 km/h

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 12° 0.1mm 11 26 93.08%

09:00 12° dry 18 33 87.75%

12:00 14° dry 25 44 73.08%

15:00 14° dry 29 53 74.5%

18:00 14° 1mm 25 50 89.05%

21:00 12° 3mm 20 42 92.53%

Tue Tuesday 8 September

Poor

Temp12°C

Rain12mm

Wind26 km/h

Gusts53 km/h

Humidity75%

11.9mm rain forecastWindy — 26 km/h, gusts 53 km/h

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 9° dry 18 38 92.2%

09:00 10° 0.5mm 24 47 87.87%

12:00 11° 0.5mm 27 53 75.02%

15:00 12° 0.5mm 26 50 74.26%

18:00 12° 0.6mm 20 40 83.97%

21:00 11° 0.5mm 19 37 90.07%

Wed Wednesday 9 September

Poor

Temp12°C

Rain1mm

Wind18 km/h

Gusts36 km/h

Humidity75%

1mm rain forecast

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger

Time °C Rain Wind (km/h) Gust Hum

06:00 9° 0.3mm 15 29 95.27%

09:00 10° 0.3mm 18 35 88.77%

12:00 11° dry 18 36 76.61%

15:00 12° dry 17 34 72.51%

18:00 12° dry 11 22 81.26%

21:00 10° dry 8 16 90.31%

Thu Thursday 10 September

Poor

Temp14°C

Rain8mm

Wind23 km/h

Gusts46 km/h

Humidity91%

7.6mm rain forecastWindy — 23 km/h, gusts 46 km/hHumidity 91% — potential fog

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 10° 0.8mm 15 28 96.39%

09:00 11° 1mm 21 40 93.06%

12:00 13° 1mm 24 46 90.48%

15:00 14° 2mm 21 41 91.22%

18:00 14° 1mm 18 34 95.01%

21:00 14° 1mm 17 32 96.66%

Fri Friday 11 September

Poor

Temp14°C

Rain5mm

Wind18 km/h

Gusts37 km/h

Humidity84%

5.4mm rain forecast

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger

Time °C Rain Wind (km/h) Gust Hum

06:00 12° 1mm 15 29 96.95%

09:00 12° 0.9mm 18 34 94%

12:00 13° 0.8mm 19 37 84.9%

15:00 14° dry 17 34 82.87%

18:00 13° dry 12 24 86.91%

21:00 12° dry 10 18 93.64%

Sat Saturday 12 September

Poor

Temp13°C

Rain6mm

Wind18 km/h

Gusts36 km/h

Humidity85%

6.1mm rain forecastHumidity 85% — potential fog

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger

Time °C Rain Wind (km/h) Gust Hum

06:00 10° dry 11 21 96.17%

09:00 11° 1mm 15 29 90.85%

12:00 13° 0.9mm 18 36 84.97%

15:00 14° 1mm 18 36 85.41%

18:00 13° 0.8mm 15 29 90.03%

21:00 12° 1.0mm 11 22 95.26%

Sun Sunday 13 September

Poor

Temp11°C

Rain0.6mm

Wind10 km/h

Gusts—

Humidity—

0.6mm rain forecast

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger

About Idwal Slabs

Classic introduction to multi-pitch mountain climbing. East-facing slabs in Cwm Idwal — morning sun, multi-pitch routes to ~160m. Polished from popularity. The descent corner stays damp longer than the slabs themselves. Up to V Diff / Severe is the bread and butter. The rock is an expansive sheet of inclined volcanic rock, highly polished on lower classics but offering reliable friction, small dish holds, and clean natural crack protection. Central drainage lines hold seepage for a while after heavy rain. Iconic mountain classics include Tennis Shoe (HS 4a), Hope (V Diff), Faith (V Diff), and Lazarus (VS 4c). Approach is a pleasant twenty-minute walk along established stone paths from the Ogwen Cottage visitor centre. Weekend congestion is severe on popular routes — early starts help avoid long queues at stance belays.

Region: North Wales — Ogwen
Rock type: Rhyolite
Aspect: east-facing
Altitude: 500m
Exposure: high
Seepage: medium

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