Right now

Temp20°C

Wind15.8 km/h

Gusts24 km/h

Humidity92.5%

Rain 48h0mm

Last rainNone recent

Assessment

No recent rain

High humidity (92.5%) — granite friction compromised, particularly for bouldering

Humidity 92.5% — potential fog/cloud, rock may be damp from condensation

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Friday 14 August

Good

Temp22°C

Rain0mm

Wind16 km/h

Gusts24 km/h

Humidity77%

No recent rain

Time °C Rain Wind Gust Hum

06:00 20° 0mm 16 0 92.5%

07:00 20° 0mm 13 0 88.3%

08:00 21° 0mm 12 0 83.3%

09:00 21° 0mm 13 0 79.2%

10:00 22° 0mm 13 0 78.3%

11:00 22° 0mm 13 0 76.4%

12:00 22° 0mm 14 0 75.6%

13:00 22° 0mm 15 0 76%

14:00 22° 0mm 17 0 77%

15:00 22° 0mm 18 0 77.2%

16:00 22° 0mm 21 0 78.9%

17:00 21° 0mm 25 0 83%

18:00 20° 0mm 26 0 87.6%

19:00 19° 0mm 26 0 90%

20:00 19° 0mm 24 0 90.8%

21:00 19° 0mm 22 0 90%

Sat Saturday 15 August

Good

Temp20°C

Rain0mm

Wind26 km/h

Gusts—

Humidity67%

No recent rain

Good conditions for granite
Breezy — helps drying

Time °C Rain Wind Gust Hum

06:00 18° 0mm 27 0 78.6%

07:00 19° 0mm 26 0 74.5%

08:00 19° 0mm 27 0 71.6%

09:00 20° 0mm 26 0 71.7%

10:00 20° 0mm 24 0 68.5%

11:00 20° 0mm 24 0 66.5%

12:00 20° 0mm 25 0 66.4%

13:00 20° 0mm 27 0 66%

14:00 20° 0mm 27 0 64.8%

15:00 20° 0mm 25 0 65.8%

16:00 19° 0mm 28 0 69.1%

17:00 19° 0mm 30 0 71.5%

18:00 18° 0mm 28 0 72.5%

19:00 18° 0mm 28 0 72.7%

20:00 17° 0mm 25 0 72.2%

21:00 17° 0mm 24 0 72.5%

Sun Sunday 16 August

Good

Temp20°C

Rain0mm

Wind15 km/h

Gusts—

Humidity63%

No recent rain

Good conditions for granite

Time °C Rain Wind Gust Hum

06:00 17° 0mm 19 0 77.2%

07:00 18° 0mm 20 0 72%

08:00 19° 0mm 17 0 69%

09:00 19° 0mm 14 0 66.7%

10:00 20° 0mm 14 0 63.3%

11:00 20° 0mm 13 0 63.1%

12:00 20° 0mm 12 0 62.9%

13:00 21° 0mm 11 0 62.4%

14:00 20° 0mm 17 0 63.4%

15:00 20° 0mm 21 0 63.3%

16:00 20° 0mm 19 0 64.5%

17:00 19° 0mm 16 0 65.7%

18:00 19° 0mm 19 0 67.4%

Mon Monday 17 August

Poor

Temp21°C

Rain0.3mm

Wind21 km/h

Gusts—

Humidity79%

0.3mm rain forecast

Breezy — helps drying

Time °C Rain Wind Gust Hum

06:00 19° 0.08mm 16 0 83.5%

12:00 21° 0.12mm 21 0 78.8%

18:00 21° 0.07mm 16 0 82.8%

Tue Tuesday 18 August

Poor

Temp22°C

Rain0.8mm

Wind24 km/h

Gusts—

Humidity81%

0.8mm rain forecast

Breezy — helps drying

Time °C Rain Wind Gust Hum

06:00 19° 0.2mm 16 0 95.1%

12:00 22° 0.22mm 24 0 81.2%

18:00 20° 0.25mm 25 0 91.9%

Wed Wednesday 19 August

Good

Temp19°C

Rain0.2mm

Wind16 km/h

Gusts—

Humidity69%

Should be dry

Good conditions for granite

Time °C Rain Wind Gust Hum

06:00 17° 0.07mm 17 0 85.2%

12:00 19° 0.07mm 16 0 69.4%

18:00 18° 0.02mm 17 0 64%

Thu Thursday 20 August

Poor

Temp18°C

Rain0.7mm

Wind27 km/h

Gusts—

Humidity71%

0.7mm rain forecast

Good conditions for granite
Breezy — helps drying

Time °C Rain Wind Gust Hum

06:00 16° 0.15mm 22 0 79.7%

12:00 18° 0.23mm 27 0 70.5%

18:00 18° 0.17mm 32 0 65.3%

Fri Friday 21 August

Poor

Temp18°C

Rain0.6mm

Wind30 km/h

Gusts—

Humidity66%

0.6mm rain forecast

Good conditions for granite
Breezy — helps drying

Time °C Rain Wind Gust Hum

06:00 17° 0.1mm 33 0 75.5%

12:00 18° 0.27mm 30 0 66.4%

18:00 18° 0.03mm 25 0 67.1%

Sat Saturday 22 August

Poor

Temp17°C

Rain0.6mm

Wind9 km/h

Gusts—

Humidity81%

0.6mm rain forecast

Good conditions for granite

Time °C Rain Wind Gust Hum

06:00 15° 0.35mm 8 0 82.8%

12:00 17° 0.2mm 9 0 80.8%

18:00 17° 0mm 14 0 78.4%

Sun Sunday 23 August

Good

Temp18°C

Rain0.2mm

Wind18 km/h

Gusts—

Humidity71%

Should be dry

Good conditions for granite

Time °C Rain Wind Gust Hum

06:00 16° 0.22mm 15 0 80.5%

12:00 18° 0mm 18 0 71.3%

Chun Castle Boulders are a collection of coarse granite tor blocks situated near the historic iron-age hill fort of Chun Castle. The rock character offers high-friction granite with crisp crimps, sloper mantels, and clean compression edges across low-lying blocks. Facing all directions across the hilltop, boulderers can easily choose sunny or shaded problems throughout the day. Bouldering options span friendly introductory problems up to technical 7th grade roof testpieces, featuring lines like Chun Arete. Access takes ten minutes along clear moorland paths from minor road parking near Chun Farm. Open moorland winds ensure quick drying after rainfall.

About Chun Castle Boulders

Region: Cornwall — West Penwith
Rock type: granite
Altitude: 210m
Exposure: medium
Seepage: low

Other crags in this region

Aire Point Cape Cornwall Carn Barra Carn Gloose Carn Les Boel Gurnard's Head Kenidjack Cliff Pedn-a-Vounder Pendeen Watch Porth Ledden Porthcurno Zennor Aerie Carn Galver Rosemergy Mountain