Right now

Temp6°C

Wind39 km/h

Gusts47 km/h

Humidity100%

Rain 48hdry

Last rainNone recent

Assessment

0.5mm rain forecast

Wind 42 km/h, gusts 53 km/h — too windy

Humidity 100% — likely fog/cloud

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

Windy — 39 km/h, gusts 47 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

Wind42 km/h

Gusts53 km/h

Humidity100%

0.5mm rain forecastWind 42 km/h, gusts 53 km/h — too windyHumidity 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 6° dry 39 47 100%

15:00 7° dry 44 53 99.94%

18:00 6° 0.2mm 51 60 99.66%

21:00 6° 0.3mm 57 69 99.65%

Thu Thursday 17 September

Poor

Temp5°C

Rain5mm

Wind52 km/h

Gusts65 km/h

Humidity93%

4.5mm rain forecastWind 52 km/h, gusts 65 km/h — too windyHumidity 93% — 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 51 61 99.12%

09:00 5° dry 51 62 97.66%

12:00 5° 0.1mm 53 65 92.99%

15:00 5° 0.4mm 51 63 92.65%

18:00 6° dry 52 62 93.21%

21:00 5° dry 52 64 95.88%

Fri Friday 18 September

Poor

Temp6°C

Rain8mm

Wind69 km/h

Gusts93 km/h

Humidity97%

7.5mm rain forecastWind 69 km/h, gusts 93 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 41 51 98.82%

09:00 5° dry 48 62 96.88%

12:00 6° 0.5mm 66 86 95.85%

15:00 7° 4mm 71 93 97.97%

18:00 8° 2mm 63 86 98.77%

21:00 9° 2mm 54 78 98.76%

Sat Saturday 19 September

Poor

Temp9°C

Rain9mm

Wind47 km/h

Gusts73 km/h

Humidity92%

9.2mm rain forecastWind 47 km/h, gusts 73 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 8° 1mm 52 75 98%

09:00 8° 1mm 51 75 96.76%

12:00 9° 1mm 48 73 92.82%

15:00 9° 1mm 46 70 92.15%

18:00 8° 0.8mm 44 63 94.43%

21:00 7° dry 42 59 94.49%

Sun Sunday 20 September

Caution

Temp7°C

Rain0.2mm

Wind30 km/h

Gusts48 km/h

Humidity80%

Drying — 18h since rainWindy — 30 km/h, gusts 48 km/h

Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 5° dry 36 49 94.34%

09:00 5° dry 31 48 87.71%

12:00 7° dry 30 48 79.3%

15:00 7° dry 30 47 79.89%

18:00 7° dry 31 42 89.94%

21:00 6° 0.2mm 32 43 95.97%

Mon Monday 21 September

Poor

Temp10°C

Rain3mm

Wind31 km/h

Gusts48 km/h

Humidity94%

2.8mm rain forecastWindy — 31 km/h, gusts 48 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 7° 0.4mm 36 49 98.48%

09:00 8° 0.4mm 33 47 97.36%

12:00 10° 0.4mm 32 48 94.5%

15:00 10° 0.3mm 31 47 94.31%

18:00 10° 0.3mm 31 43 97.53%

21:00 9° 0.3mm 30 41 98.42%

Tue Tuesday 22 September

Poor

Temp9°C

Rain4mm

Wind23 km/h

Gusts39 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 8° 0.6mm 31 42 98.23%

09:00 9° 0.6mm 29 42 96.06%

12:00 9° 0.7mm 25 39 91.77%

15:00 9° 0.6mm 21 33 89.31%

18:00 9° 0.3mm 21 28 93.8%

21:00 7° dry 22 28 96.41%

Wed Wednesday 23 September

Good

Temp8°C

Raindry

Wind22 km/h

Gusts35 km/h

Humidity81%

Should be dry

Good temperature for mountain rhyolite
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 5° dry 22 27 97.25%

09:00 6° dry 21 31 88.68%

12:00 8° dry 22 35 81.27%

About Ysgolion Duon (Black Ladders)

The 'Black Ladders' — a huge, brooding amphitheatre on the north side of Carnedd Dafydd deep in the Carneddau wilderness. Primarily a winter climbing venue with a very Scottish feel: mixed pitches of water ice, bare rock chimneys and frozen turf, sometimes all in a single pitch. Routes up to 250m and 10 pitches. In summer, the north aspect and heavy seepage keep the rock damp — most summer trad here is a serious undertaking rather than a fun day out. Remote: ~90 minute walk-in from any direction, longer than most other Snowdonia venues. Full mountain kit and navigation are essential; conditions turn quickly at 750m.

Region: Snowdonia — Carneddau
Rock type: Rhyolite
Aspect: north-facing
Altitude: 750m
Exposure: high
Seepage: very-high

Other crags in this region

Craig yr Ysfa