Climbing Forecast › North Wales — Snowdon › Clogwyn Du'r Arddu (Cloggy)

NORTH WALES — SNOWDON · RHYOLITE

Clogwyn Du'r Arddu (Cloggy) weather & climbing conditions

Poor — wet, too windy or closed

Right now

Temp3°C
Wind32 km/h
Gusts46 km/h
Humidity100%
Rain 48h0.3mm
Last rain1h ago

Assessment

9mm rain forecast
Wind 58 km/h, gusts 85 km/h — too windy
Humidity 97% — likely fog/cloud
Cold — excellent friction but watch for damp seeping features
High humidity (100%) — rhyolite friction compromised, particularly for bouldering
Windy — 32 km/h, gusts 46 km/h. Take care on exposed routes

Drying Time

11% dry · 8-16h to dry

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Wednesday 21 October
Poor
Temp1°C
Rain9mm
Wind58 km/h
Gusts85 km/h
Humidity97%
9mm rain forecastWind 58 km/h, gusts 85 km/h — too windyHumidity 97% — likely fog/cloud
  • Cold mountain conditions — pack warm belay layers
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
10:00 3° 0.3mm 32 46 100%
13:00 1° 6mm 70 81 99.6%
16:00 0° 2mm 71 85 92.03%
19:00 1° 0.1mm 53 65 82.34%
Thu Thursday 22 October
Poor
Temp2°C
Rain6mm
Wind28 km/h
Gusts42 km/h
Humidity87%
5.6mm rain forecastWindy — 28 km/h, gusts 42 km/hHumidity 87% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
07:00 1° 3mm 32 41 98.44%
10:00 1° 0.5mm 32 42 97.37%
13:00 2° dry 24 34 83.34%
16:00 3° dry 27 34 80.97%
19:00 3° dry 35 45 82.73%
Fri Friday 23 October
Poor
Temp1°C
Rain10mm
Wind62 km/h
Gusts94 km/h
Humidity92%
9.5mm rain forecastWind 62 km/h, gusts 94 km/h — too windyHumidity 92% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
07:00 4° 0.2mm 22 29 92.89%
10:00 3° 3mm 60 87 97.43%
13:00 1° dry 66 94 94.46%
16:00 1° dry 59 90 85.36%
19:00 1° dry 54 78 78.82%
Sat Saturday 24 October
Poor
Temp4°C
Rain26mm
Wind67 km/h
Gusts108 km/h
Humidity96%
25.6mm rain forecastWind 67 km/h, gusts 108 km/h — too windyHumidity 96% — likely fog/cloud
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
07:00 1° 0.6mm 42 59 95.48%
10:00 2° 3mm 62 89 96.13%
13:00 4° 8mm 74 108 96.24%
16:00 6° 9mm 66 96 96.69%
19:00 5° 5mm 66 98 93.32%
Sun Sunday 25 October
Poor
Temp2°C
Rain1mm
Wind57 km/h
Gusts90 km/h
Humidity79%
1.2mm rain forecastWind 57 km/h, gusts 90 km/h — too windy
  • Cold mountain conditions — pack warm belay layers
  • 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 1° 0.1mm 68 99 88.67%
09:00 1° 0.8mm 65 95 87.76%
12:00 2° dry 59 90 80.56%
15:00 2° dry 55 81 76.98%
18:00 2° dry 51 71 80.06%
21:00 1° dry 46 64 83.52%
Mon Monday 26 October
Poor
Temp6°C
Rain21mm
Wind81 km/h
Gusts113 km/h
Humidity94%
20.9mm rain forecastWind 81 km/h, gusts 113 km/h — too windyHumidity 94% — potential fog
  • 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 2° 2mm 64 85 94.08%
09:00 4° 4mm 73 98 94.97%
12:00 6° 5mm 80 110 94.86%
15:00 6° 4mm 82 113 93.11%
18:00 6° 3mm 79 110 92.3%
21:00 5° 3mm 75 105 90.26%
Tue Tuesday 27 October
Poor
Temp2°C
Rain0.5mm
Wind56 km/h
Gusts83 km/h
Humidity81%
0.5mm rain forecastWind 56 km/h, gusts 83 km/h — too windy
  • Cold mountain conditions — pack warm belay layers
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
06:00 2° dry 65 91 89.66%
09:00 2° 0.1mm 62 87 87.23%
12:00 2° dry 56 83 81.18%
15:00 2° dry 55 79 80.74%
18:00 2° dry 55 76 85.82%
21:00 2° dry 56 77 88.65%
Wed Wednesday 28 October
Poor
Temp3°C
Rain3mm
Wind59 km/h
Gusts—
Humidity—
3.3mm rain forecastWind 59 km/h, gusts null km/h — too windy
  • Cold mountain conditions — pack warm belay layers
  • 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 2° 1mm 58 77 94.21%
09:00 3° 1mm 57 78 93.48%

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

Other crags in this region

Y Lliwedd