Right now

Temp7°C

Wind37 km/h

Gusts46 km/h

Humidity100%

Rain 48hdry

Last rainNone recent

Assessment

0.5mm rain forecast

Windy — 41 km/h, gusts 54 km/h

Humidity 100% — likely fog/cloud

High humidity (100%) — rhyolite friction compromised, particularly for bouldering

Windy — 37 km/h, gusts 46 km/h. Take care on exposed routes

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Wednesday 16 September

Poor

Temp7°C

Rain0.5mm

Wind41 km/h

Gusts54 km/h

Humidity100%

0.5mm rain forecastWindy — 41 km/h, gusts 54 km/hHumidity 100% — likely fog/cloud

Damp mountain air — upper pitches may stay greasy
Very windy — consider sheltered alternatives

Time °C Rain Wind (km/h) Gust Hum

12:00 7° dry 37 46 100%

15:00 7° dry 45 54 99.94%

18:00 7° 0.3mm 51 60 99.65%

21:00 7° 0.2mm 57 66 99.61%

Thu Thursday 17 September

Poor

Temp6°C

Rain4mm

Wind49 km/h

Gusts61 km/h

Humidity91%

4.4mm rain forecastWind 49 km/h, gusts 61 km/h — too windyHumidity 91% — 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 7° dry 48 57 98.95%

09:00 6° dry 47 57 96.22%

12:00 5° dry 49 61 91.27%

15:00 6° 0.3mm 49 61 90.95%

18:00 6° 0.2mm 47 57 92.68%

21:00 6° dry 50 60 94.75%

Fri Friday 18 September

Poor

Temp7°C

Rain9mm

Wind64 km/h

Gusts90 km/h

Humidity97%

8.9mm rain forecastWind 64 km/h, gusts 90 km/h — too windyHumidity 97% — 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

06:00 5° dry 39 49 98.78%

09:00 6° dry 45 59 96.21%

12:00 6° 0.6mm 61 82 95.91%

15:00 7° 5mm 67 90 97.98%

18:00 8° 2mm 60 84 98.77%

21:00 9° 1mm 53 77 98.76%

Sat Saturday 19 September

Poor

Temp9°C

Rain9mm

Wind45 km/h

Gusts72 km/h

Humidity93%

9.1mm rain forecastWind 45 km/h, gusts 72 km/h — too windyHumidity 93% — 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 9° 1mm 50 74 98%

09:00 9° 1mm 48 74 96.76%

12:00 9° 2mm 46 72 92.83%

15:00 9° 1mm 44 69 92.27%

18:00 9° 0.9mm 42 62 94.36%

21:00 8° dry 41 58 94.41%

Sun Sunday 20 September

Poor

Temp7°C

Rain0.3mm

Wind28 km/h

Gusts47 km/h

Humidity80%

0.3mm rain forecastWindy — 28 km/h, gusts 47 km/h

Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 5° dry 34 48 94.31%

09:00 6° dry 30 48 87.71%

12:00 7° dry 29 47 80.08%

15:00 8° dry 28 46 80.35%

18:00 8° dry 29 41 90.03%

21:00 7° 0.3mm 32 43 95.9%

Mon Monday 21 September

Poor

Temp10°C

Rain3mm

Wind30 km/h

Gusts47 km/h

Humidity94%

3.3mm rain forecastWindy — 30 km/h, gusts 47 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 8° 0.5mm 35 48 98.48%

09:00 9° 0.5mm 32 47 97.29%

12:00 10° 0.5mm 30 47 94.54%

15:00 10° 0.4mm 30 46 94.38%

18:00 10° 0.4mm 31 43 97.53%

21:00 9° 0.3mm 30 41 98.42%

Tue Tuesday 22 September

Poor

Temp10°C

Rain4mm

Wind22 km/h

Gusts38 km/h

Humidity91%

3.5mm rain forecastHumidity 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 9° 0.6mm 30 41 98.23%

09:00 9° 0.6mm 28 42 96.17%

12:00 10° 0.7mm 24 38 91.99%

15:00 10° 0.6mm 20 32 89.42%

18:00 9° 0.3mm 20 27 93.8%

21:00 8° dry 21 27 96.41%

Wed Wednesday 23 September

Good

Temp8°C

Raindry

Wind21 km/h

Gusts35 km/h

Humidity82%

Should be dry

Good temperature for mountain rhyolite
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 6° dry 21 27 97.25%

09:00 7° dry 20 30 88.93%

12:00 8° dry 21 35 81.76%

About Craig Ddu

The first Llanberis Pass crag on the sunny southern side as you drive up from Nant Peris — often overlooked because of its more famous neighbours, but home to some brilliant, quiet routes. South-facing rhyolite that catches good sun, though a persistent drainage line through the left-hand section keeps that part of the cliff damp for most of the year unless there's been a real drought. The right-hand side dries fast. Rib and Slab (VD) is the accessible starter; Yellow Wall (HS), Orpheus (E1) and Mabinogion (E2) are the standout harder lines. Rarely crowded even on the best summer days.

Region: North Wales — Llanberis Pass
Rock type: Rhyolite
Aspect: south-facing
Altitude: 280m
Exposure: medium
Seepage: medium

Other crags in this region

Carreg Wastad Clogwyn y Grochan Cromlech Boulders Cyrn Las Dinas Cromlech Dinas Mot