Climbing Forecast › Snowdonia — Llanberis › Dinorwic Slate Quarry (Twll Mawr)

SNOWDONIA — LLANBERIS · SLATE

Dinorwic Slate Quarry (Twll Mawr) climbing conditions

Poor — wet, too windy or closed

Right now

Temp14°C
Wind25 km/h
Gusts30 km/h
Humidity78.93%
Rain 48hdry
Last rainNone recent

Assessment

0.5mm rain forecast
Good friction temperature range for slate
Breezy — good for drying

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Wednesday 16 September
Poor
Temp14°C
Rain0.5mm
Wind22 km/h
Gusts30 km/h
Humidity77%
0.5mm rain forecast
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
12:00 14° dry 25 30 78.93%
15:00 14° dry 20 30 74.49%
18:00 14° 0.2mm 13 33 86.56%
21:00 14° 0.2mm 15 39 83.46%
Thu Thursday 17 September
Poor
Temp15°C
Rain3mm
Wind21 km/h
Gusts42 km/h
Humidity69%
3.2mm rain forecast
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 14° dry 12 31 82.42%
09:00 13° dry 19 38 74.14%
12:00 14° dry 22 42 69.21%
15:00 15° dry 21 41 69.72%
18:00 14° 0.1mm 13 32 73.47%
21:00 14° dry 15 35 74.99%
Fri Friday 18 September
Poor
Temp14°C
Rain6mm
Wind31 km/h
Gusts57 km/h
Humidity87%
6.3mm rain forecastWindy — 31 km/h, gusts 57 km/h
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 13° dry 13 30 83.25%
09:00 14° dry 22 42 75.74%
12:00 14° 0.5mm 30 55 81.68%
15:00 14° 4mm 31 57 91.6%
18:00 15° 2mm 31 55 93.71%
21:00 16° dry 31 52 94.06%
Sat Saturday 19 September
Caution
Temp16°C
Raindry
Wind28 km/h
Gusts50 km/h
Humidity82%
Should be dryWindy — 28 km/h, gusts 50 km/h
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 15° dry 28 47 94.2%
09:00 16° dry 30 50 89.69%
12:00 16° dry 29 50 82.47%
15:00 17° dry 27 45 81.83%
18:00 16° dry 21 35 83.21%
21:00 15° dry 22 37 79.57%
Sun Sunday 20 September
Good
Temp15°C
Raindry
Wind19 km/h
Gusts35 km/h
Humidity71%
Should be dry
Time °C Rain Wind (km/h) Gust Hum
06:00 13° dry 18 30 80.78%
09:00 13° dry 21 35 75.16%
12:00 14° dry 20 35 71%
15:00 15° dry 19 32 71.19%
18:00 15° dry 15 24 80.3%
21:00 14° dry 15 25 86.59%
Mon Monday 21 September
Poor
Temp17°C
Rain1mm
Wind20 km/h
Gusts35 km/h
Humidity90%
1.2mm rain forecast
Time °C Rain Wind (km/h) Gust Hum
06:00 14° 0.3mm 17 28 94.49%
09:00 15° 0.3mm 19 32 92.51%
12:00 16° 0.3mm 21 35 90.31%
15:00 17° 0.2mm 20 34 89.99%
18:00 16° dry 18 29 93.48%
21:00 16° dry 17 28 94.91%
Tue Tuesday 22 September
Poor
Temp16°C
Rain2mm
Wind16 km/h
Gusts30 km/h
Humidity86%
2.3mm rain forecast
Time °C Rain Wind (km/h) Gust Hum
06:00 15° 0.5mm 17 27 96.02%
09:00 15° 0.7mm 17 30 92.49%
12:00 16° 0.5mm 17 30 87.35%
15:00 16° dry 15 25 85.38%
18:00 15° dry 11 17 89.34%
21:00 14° dry 11 17 90.77%
Wed Wednesday 23 September
Good
Temp15°C
Raindry
Wind16 km/h
Gusts28 km/h
Humidity76%
Should be dry
Time °C Rain Wind (km/h) Gust Hum
06:00 13° dry 10 16 91.14%
09:00 14° dry 13 22 82.84%
12:00 15° dry 16 28 76.34%

About Dinorwic Slate Quarry (Twll Mawr)

The 'Big Hole' — the deepest of the Dinorwic slate workings and home to the biggest and hardest lines on Welsh slate. Twll Mawr is a huge, atmospheric quarry pit whose north-facing south wall hosts Johnny Dawes's 1986 The Quarryman (E8 6b) — a four-pitch monument to modern British slate climbing whose iconic 'Quarryman groove' pitch featured in the seminal 1980s Stone Monkey film. Steve McClure made the first single-day ascent of all pitches in 2011. Joe Brown and Claude Davies's 1971 Opening Gambit takes the same wall at E2 5c. Sheltered inside the pit — winds don't reach — and the compact slate stays dry. Thirty minutes' walk up the inclines from the National Slate Museum.

Region
Snowdonia — Llanberis
Rock type
Slate
Aspect
north-facing
Altitude
380m
Exposure
low
Seepage
low

Other crags in this region

Dinorwic Slate Quarry (Australia Quarry)Dinorwic Slate Quarry (California & Bus Stop)Dinorwic Slate Quarry (Rainbow Slab)Dinorwic Slate Quarry (Serengeti & Never Never Land)Dinorwic Slate Quarry (Vivian)