Right now

Temp8°C

Wind23 km/h

Gusts43 km/h

Humidity88.32%

Rain 48hdry

Last rainNone recent

Assessment

0.8mm rain forecast

Wind 46 km/h, gusts 57 km/h — too windy

Humidity 94% — potential fog

Good friction temperature range for rhyolite

High humidity (88.32%) — rhyolite friction compromised, particularly for bouldering

Humidity 88.32% — potential fog/cloud, rock may be damp from condensation

Breezy — good for drying

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Thursday 17 September

Poor

Temp7°C

Rain0.8mm

Wind46 km/h

Gusts57 km/h

Humidity94%

0.8mm rain forecastWind 46 km/h, gusts 57 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

09:00 8° dry 23 43 88.32%

12:00 8° dry 46 56 96.22%

15:00 7° 0.4mm 47 57 90.82%

18:00 7° 0.3mm 48 57 88.72%

21:00 7° dry 45 55 89.62%

Fri Friday 18 September

Poor

Temp8°C

Rain11mm

Wind62 km/h

Gusts86 km/h

Humidity95%

11.1mm rain forecastWind 62 km/h, gusts 86 km/h — too windyHumidity 95% — likely fog/cloud

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 6° dry 38 48 92.03%

09:00 7° dry 44 58 91.97%

12:00 7° dry 56 73 92.89%

15:00 8° 5mm 68 86 98.02%

18:00 9° 6mm 67 86 98.85%

21:00 10° 0.6mm 62 81 98.77%

Sat Saturday 19 September

Poor

Temp10°C

Rain3mm

Wind44 km/h

Gusts71 km/h

Humidity92%

3.3mm rain forecastWind 44 km/h, gusts 71 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 10° 0.5mm 60 81 98.47%

09:00 11° 0.5mm 53 75 97.25%

12:00 11° dry 48 71 94.24%

15:00 10° dry 40 65 89.19%

18:00 10° 0.2mm 39 58 92.83%

21:00 9° dry 38 55 93.59%

Sun Sunday 20 September

Caution

Temp8°C

Rain0.2mm

Wind27 km/h

Gusts44 km/h

Humidity78%

Drying — 18h since rainWindy — 27 km/h, gusts 44 km/h

Good temperature for mountain rhyolite
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 6° dry 32 45 94.06%

09:00 6° dry 27 45 84.95%

12:00 8° dry 26 44 76.91%

15:00 9° dry 27 44 78.16%

18:00 8° dry 29 41 90.07%

21:00 8° 0.2mm 34 46 96.09%

Mon Monday 21 September

Poor

Temp12°C

Rain0.7mm

Wind26 km/h

Gusts42 km/h

Humidity94%

0.7mm rain forecastWindy — 26 km/h, gusts 42 km/hHumidity 94% — 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 9° 0.1mm 33 44 98.42%

09:00 10° dry 30 44 96.46%

12:00 11° 0.2mm 26 42 93.6%

15:00 12° dry 25 40 93.6%

18:00 11° dry 27 37 97.32%

21:00 10° dry 26 35 98.36%

Tue Tuesday 22 September

Poor

Temp11°C

Rain0.8mm

Wind25 km/h

Gusts40 km/h

Humidity88%

0.8mm rain forecastWindy — 25 km/h, gusts 40 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 9° dry 29 38 97.57%

09:00 10° 0.1mm 28 41 92.97%

12:00 11° 0.2mm 26 40 88.91%

15:00 12° 0.3mm 24 37 87.78%

18:00 11° dry 25 33 94.21%

21:00 9° 0.2mm 26 34 94.78%

Wed Wednesday 23 September

Good

Temp9°C

Rain0.2mm

Wind21 km/h

Gusts37 km/h

Humidity74%

Should be dry

Good temperature for mountain rhyolite
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 6° dry 27 35 95.51%

09:00 7° dry 24 36 85.94%

12:00 9° dry 22 37 73.71%

15:00 9° dry 20 33 74.01%

18:00 8° dry 21 28 87.1%

21:00 6° dry 27 33 93.24%

Thu Thursday 24 September

Caution

Temp6°C

Raindry

Wind38 km/h

Gusts—

Humidity—

Should be dryWindy — 38 km/h, gusts null km/h

Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

06:00 5° dry 36 47 94.01%

09:00 6° dry 38 53 87.32%

About Craig Cau (Cader Idris)

The south-side cirque of Cader Idris — steep cliffs of acid tuffs from the Craig Cau Formation rising above Llyn Cau. Home to Pencoed Pillar and a scattering of trad routes on the impressive north-facing pillars and buttresses that ring the cwm.

Region: Mid Wales — Cader Idris
Rock type: Rhyolite
Aspect: north-facing
Altitude: 750m
Exposure: high
Seepage: medium