Right now

Temp13°C

Wind21 km/h

Gusts31 km/h

Humidity77.9%

Rain 48hdry

Last rainNone recent

Assessment

0.9mm rain forecast

Good friction temperature range for rhyolite

Breezy — good for drying

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Wednesday 16 September

Poor

Temp13°C

Rain0.9mm

Wind20 km/h

Gusts31 km/h

Humidity77%

0.9mm rain forecast

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger

Time °C Rain Wind (km/h) Gust Hum

14:00 13° dry 21 — 77.9%

15:00 13° dry 20 — 75.5%

16:00 12° dry 18 — 76.5%

17:00 12° 0.1mm 20 — 82.5%

18:00 11° 0.3mm 21 — 91.4%

19:00 11° 0.3mm 22 — 96.7%

20:00 11° dry 23 — 98.9%

21:00 11° dry 23 — 96.4%

Thu Thursday 17 September

Poor

Temp13°C

Rain9mm

Wind25 km/h

Gusts—

Humidity78%

9mm rain forecast

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 11° dry 21 — 98.2%

07:00 10° 0.3mm 17 — 98.3%

08:00 10° dry 19 — 96.3%

09:00 11° dry 21 — 92%

10:00 12° dry 22 — 86.9%

11:00 12° 0.2mm 24 — 81.6%

12:00 13° 0.1mm 25 — 77%

13:00 13° 0.2mm 25 — 73.3%

14:00 13° 0.4mm 25 — 72.6%

15:00 13° 0.3mm 25 — 75.4%

16:00 12° 0.3mm 26 — 77.2%

17:00 11° 0.2mm 22 — 84.9%

18:00 11° dry 19 — 89.3%

19:00 10° dry 17 — 90.6%

20:00 10° dry 19 — 90.4%

21:00 10° dry 19 — 88.2%

Fri Friday 18 September

Poor

Temp12°C

Rain13mm

Wind31 km/h

Gusts—

Humidity92%

13.2mm rain forecastHumidity 92% — 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 10° 0.1mm 19 — 98.9%

07:00 10° dry 18 — 99.1%

08:00 11° 0.2mm 20 — 96.5%

09:00 12° 0.3mm 25 — 88.5%

10:00 12° 0.3mm 26 — 87.3%

11:00 12° 0.2mm 29 — 85.9%

12:00 12° 0.5mm 28 — 91.3%

13:00 12° 0.9mm 33 — 89.9%

14:00 12° 2mm 34 — 96.2%

15:00 12° 3mm 33 — 97.5%

16:00 12° 2mm 33 — 99%

17:00 13° 1mm 34 — 99.6%

18:00 14° 0.5mm 32 — 99.6%

19:00 14° 0.3mm 32 — 99.8%

20:00 14° 0.1mm 30 — 99.8%

21:00 14° 0.2mm 29 — 99.8%

Sat Saturday 19 September

Poor

Temp14°C

Rain4mm

Wind26 km/h

Gusts—

Humidity99%

3.6mm rain forecastHumidity 99% — likely fog/cloud

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 14° 0.8mm 27 — 99.6%

12:00 14° 0.7mm 26 — 99.3%

18:00 13° dry 22 — 97.9%

Sun Sunday 20 September

Good

Temp13°C

Rain0.2mm

Wind23 km/h

Gusts—

Humidity73%

Should be dry

Good temperature for mountain rhyolite
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 9° 0.1mm 21 — 90.5%

12:00 13° dry 23 — 72.5%

18:00 11° dry 13 — 79.7%

Mon Monday 21 September

Good

Temp14°C

Raindry

Wind12 km/h

Gusts—

Humidity72%

Should be dry

Good temperature for mountain rhyolite

Time °C Rain Wind (km/h) Gust Hum

06:00 6° dry 3 — 92.7%

12:00 14° dry 12 — 72.4%

18:00 11° dry 4 — 89.5%

Tue Tuesday 22 September

Good

Temp16°C

Raindry

Wind8 km/h

Gusts—

Humidity87%

Should be dry

Good temperature for mountain rhyolite
Damp mountain air — upper pitches may stay greasy

Time °C Rain Wind (km/h) Gust Hum

06:00 11° dry 4 — 99.5%

12:00 16° dry 8 — 87.3%

18:00 13° dry 3 — 97.1%

Wed Wednesday 23 September

Good

Temp18°C

Raindry

Wind13 km/h

Gusts—

Humidity71%

Should be dry

Time °C Rain Wind (km/h) Gust Hum

06:00 11° dry 3 — 99.8%

12:00 18° dry 13 — 70.9%

18:00 14° dry 4 — 93.2%

About Carreg Alltrem

A hidden gem tucked into the Lledr Valley between Blaenau Ffestiniog and Dolwyddelan — regularly listed among the top VS venues in North Wales. Volcanic rock, quick-drying, with a clean south-facing wall of steep grooves and crack lines up to 180ft (55m). Multi-pitch and single-pitch routes across a compact but concentrated crag; Lightning Visit and Lavaredo (both VS 4c) are the classic pair, Nimbus (HVS 5a) and Sunset Boulevard (E1 5b) up the challenge. Short walk from a layby on the Dolwyddelan road. Because it's off the main Ogwen/Llanberis routes it stays quiet even at peak season, making it a great choice on busy weekends.

Region: Snowdonia — Moelwynion
Rock type: Rhyolite
Aspect: south-facing
Altitude: 200m
Exposure: medium
Seepage: low