Right now

Temp8°C

Wind54 km/h

Gusts65 km/h

Humidity95.54%

Rain 48h1mm

Last rain0h ago

Assessment

2.3mm rain forecast

Wind 68 km/h, gusts 87 km/h — too windy

Good friction temperature range for rhyolite

High humidity (95.54%) — rhyolite friction compromised, particularly for bouldering

Drying Time

4% dry · 9-18h to dry

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Sunday 6 September

Poor

Temp12°C

Rain2mm

Wind68 km/h

Gusts87 km/h

Humidity79%

2.3mm rain forecastWind 68 km/h, gusts 87 km/h — too windy

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 8° 1mm 54 65 95.54%

09:00 10° 0.7mm 66 76 92.41%

12:00 11° dry 72 87 79.77%

15:00 12° dry 64 81 78.3%

18:00 12° dry 55 68 94.17%

21:00 11° 0.5mm 55 67 99.58%

Mon Monday 7 September

Poor

Temp8°C

Rain6mm

Wind43 km/h

Gusts66 km/h

Humidity84%

6.4mm rain forecastWind 43 km/h, gusts 66 km/h — too windy

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 7° dry 32 42 97.14%

09:00 7° dry 31 42 95.75%

12:00 7° dry 38 52 82.75%

15:00 8° dry 49 66 85.64%

18:00 8° 1mm 61 78 94.59%

21:00 7° 3mm 55 70 96.63%

Tue Tuesday 8 September

Poor

Temp6°C

Rain20mm

Wind41 km/h

Gusts66 km/h

Humidity80%

20.4mm rain forecastWind 41 km/h, gusts 66 km/h — too windy

Wet rhyolite is slippery; seepage from grass above can linger
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 4° dry 44 61 94.2%

09:00 5° 0.5mm 41 63 91.11%

12:00 6° 0.5mm 41 66 80.46%

15:00 6° 0.5mm 41 65 79.24%

18:00 6° 0.6mm 42 61 87.89%

21:00 5° 0.5mm 44 62 92.57%

Wed Wednesday 9 September

Poor

Temp6°C

Rain0.7mm

Wind25 km/h

Gusts44 km/h

Humidity79%

0.7mm rain forecastWindy — 25 km/h, gusts 44 km/h

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

Time °C Rain Wind (km/h) Gust Hum

06:00 4° dry 36 51 95.69%

09:00 4° 0.3mm 29 46 91.4%

12:00 6° 0.3mm 26 44 81.19%

15:00 6° dry 24 41 76.99%

18:00 6° dry 22 32 85.38%

21:00 5° dry 24 32 92.01%

Thu Thursday 10 September

Poor

Temp8°C

Rain8mm

Wind42 km/h

Gusts67 km/h

Humidity92%

7.6mm rain forecastWind 42 km/h, gusts 67 km/h — too windyHumidity 92% — potential fog

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 5° 0.8mm 36 50 96.6%

09:00 6° 1mm 43 63 93.94%

12:00 8° 1mm 45 67 91.95%

15:00 9° 2mm 39 59 92.58%

18:00 9° 1mm 41 57 95.39%

21:00 8° 1mm 40 55 96.73%

Fri Friday 11 September

Poor

Temp8°C

Rain5mm

Wind29 km/h

Gusts49 km/h

Humidity87%

5.4mm rain forecastWindy — 29 km/h, gusts 49 km/hHumidity 87% — 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 7° 1mm 37 51 96.95%

09:00 7° 0.9mm 34 50 94.72%

12:00 8° 0.8mm 30 49 87.82%

15:00 8° dry 28 44 85.54%

18:00 8° dry 26 38 89.35%

21:00 7° dry 26 35 95.13%

Sat Saturday 12 September

Poor

Temp8°C

Rain5mm

Wind32 km/h

Gusts50 km/h

Humidity88%

4.8mm rain forecastWindy — 32 km/h, gusts 50 km/hHumidity 88% — 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 6° dry 31 42 96.46%

09:00 6° 1mm 31 45 92.4%

12:00 8° 0.9mm 32 50 87.79%

15:00 8° 1mm 32 50 87.43%

18:00 8° 0.8mm 30 44 91.44%

21:00 7° 1.0mm 28 39 96.11%

Sun Sunday 13 September

Poor

Temp6°C

Rain0.6mm

Wind26 km/h

Gusts—

Humidity—

0.6mm rain forecastWindy — 26 km/h, gusts null km/h

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

About Clogwyn Du'r Arddu (Cloggy)

"The shrine of British climbing". Huge N-facing rhyolite cliff on the north flank of Snowdon, 300m tall. Long walk-in from Llanberis (~2 hr). Slow to come into condition — needs a long dry spell. Worth the wait. Alpine atmosphere.

Region: North Wales — Snowdon
Rock type: Rhyolite
Aspect: north-facing
Altitude: 700m
Exposure: high
Seepage: high