Climbing Forecast › South Wales — Black Mountains › Cwmyoy Boulders

SOUTH WALES — BLACK MOUNTAINS · SANDSTONE · bird ban

Cwmyoy Boulders climbing conditions

Good — dry and climbable

Right now

Temp14°C
Wind21 km/h
Gusts32 km/h
Humidity77.5%
Rain 48hdry
Last rainNone recent

Assessment

No recent rain
Breezy — good for drying

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Thursday 17 September
Good
Temp16°C
Rain0.2mm
Wind23 km/h
Gusts32 km/h
Humidity64%
No recent rain
  • Hard sandstone climbs well when dry
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
09:00 14° dry 21 — 77.5%
10:00 15° dry 21 — 71.6%
11:00 16° dry 21 — 66.5%
12:00 16° 0.1mm 21 — 62.8%
13:00 16° 0.1mm 25 — 61.2%
14:00 16° dry 24 — 62%
15:00 16° dry 23 — 62.6%
16:00 15° dry 23 — 64.7%
17:00 14° dry 22 — 69.1%
18:00 13° dry 21 — 74.1%
19:00 12° dry 17 — 80.1%
20:00 12° dry 16 — 82.6%
21:00 12° dry 16 — 84.3%
Fri Friday 18 September
Good
Temp14°C
Rain0.2mm
Wind23 km/h
Gusts—
Humidity75%
No recent rain
  • Hard sandstone climbs well when dry
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 11° dry 15 — 89.8%
07:00 11° dry 15 — 85.3%
08:00 13° dry 16 — 78.3%
09:00 13° dry 17 — 75.3%
10:00 14° dry 20 — 73.6%
11:00 14° dry 21 — 73.5%
12:00 14° dry 22 — 75.3%
13:00 15° dry 25 — 75.8%
14:00 15° dry 26 — 74.1%
15:00 15° dry 24 — 76.4%
16:00 15° dry 26 — 77.1%
17:00 15° dry 27 — 77.2%
18:00 15° dry 28 — 80.9%
19:00 15° dry 26 — 85.7%
20:00 15° dry 28 — 86.8%
21:00 15° dry 28 — 89.6%
Sat Saturday 19 September
Poor
Temp17°C
Rain5mm
Wind23 km/h
Gusts—
Humidity90%
5mm rain forecastDo not climb wet sandstoneHumidity 90% — potential fog
  • Wet sandstone is slippery — let the rock dry before leading
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 15° dry 23 — 93.4%
07:00 15° 0.1mm 23 — 93.2%
08:00 15° 0.1mm 23 — 93.1%
09:00 16° dry 23 — 92.3%
10:00 17° dry 23 — 91.1%
11:00 18° dry 26 — 87.4%
12:00 18° 0.2mm 26 — 87.6%
13:00 17° 0.2mm 23 — 90.3%
14:00 17° dry 22 — 91.3%
15:00 17° 0.2mm 22 — 91.3%
16:00 17° 2mm 21 — 91.2%
17:00 16° 0.1mm 18 — 93.8%
18:00 16° dry 17 — 93.4%
19:00 16° 0.6mm 20 — 94%
20:00 16° 0.4mm 21 — 94.3%
21:00 16° dry 21 — 93.1%
Sun Sunday 20 September
Caution
Temp16°C
Raindry
Wind17 km/h
Gusts—
Humidity59%
Drying — 16h since rainSandstone may still hold subsurface moisture
  • Hard sandstone climbs well when dry
Time °C Rain Wind (km/h) Gust Hum
06:00 12° dry 12 — 90.1%
12:00 16° dry 17 — 58.7%
18:00 13° dry 9 — 67.8%
Mon Monday 21 September
Caution
Temp17°C
Raindry
Wind6 km/h
Gusts—
Humidity58%
Should be drySandstone may still hold subsurface moisture
  • Hard sandstone climbs well when dry
Time °C Rain Wind (km/h) Gust Hum
06:00 8° dry 1 — 84.2%
12:00 17° dry 6 — 57.6%
18:00 16° dry 2 — 77.6%
Tue Tuesday 22 September
Caution
Temp18°C
Raindry
Wind1 km/h
Gusts—
Humidity75%
Should be drySandstone may still hold subsurface moisture
  • Hard sandstone climbs well when dry
Time °C Rain Wind (km/h) Gust Hum
06:00 12° dry 3 — 98.9%
12:00 18° dry 1 — 74.6%
18:00 18° dry 4 — 78.2%
Wed Wednesday 23 September
Good
Temp20°C
Raindry
Wind16 km/h
Gusts—
Humidity66%
Should be dry
  • Hard sandstone climbs well when dry
Time °C Rain Wind (km/h) Gust Hum
06:00 12° dry 1 — 96.1%
12:00 20° dry 16 — 66.4%
18:00 18° dry 7 — 76.6%
Thu Thursday 24 September
Good
Temp20°C
Raindry
Wind16 km/h
Gusts—
Humidity57%
Should be dry
  • Hard sandstone climbs well when dry
Time °C Rain Wind (km/h) Gust Hum
06:00 11° dry 4 — 94.9%
12:00 20° dry 16 — 57.3%
18:00 18° dry 13 — 57.9%
Bird ban (1 March to 30 November)
Landowner permission granted only December 1st to February 28th; the cliff is an SSSI for rare plants and wildlife.

About Cwmyoy Boulders

Sandstone bouldering at the base of The Darren above the village of Cwmyoy in the Black Mountains. The cliff is a Site of Special Scientific Interest with rare plants, so cleaning must be kept to a minimum and nothing removed. Access is by the B4423 north from Llanfihangel Crucorney via Llanthony, or south from Hay-on-Wye over Gospel Pass.

Region
South Wales — Black Mountains
Rock type
Sandstone
Aspect
west-facing
Altitude
300m
Exposure
medium
Seepage
medium