Right now

Temp15°C

Wind21 km/h

Gusts31 km/h

Humidity95.6%

Rain 48h3mm

Last rain0h ago

Assessment

8.9mm rain forecast

Good friction temperature range for basalt

High humidity (95.6%) — basalt friction compromised, particularly for bouldering

Humidity 95.6% — potential fog/cloud, rock may be damp from condensation

Breezy — good for drying

Drying Time

2% dry · 15-29h to dry

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Sunday 6 September

Poor

Temp18°C

Rain9mm

Wind31 km/h

Gusts31 km/h

Humidity80%

8.9mm rain forecast

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 15° 2mm 21 — 95.6%

07:00 16° 2mm 20 — 96.3%

08:00 16° 0.5mm 25 — 96%

09:00 16° 0.1mm 28 — 95.6%

10:00 16° dry 30 — 94.8%

11:00 17° dry 27 — 91.6%

12:00 18° dry 32 — 79.1%

13:00 19° dry 35 — 71%

14:00 19° dry 34 — 70.5%

15:00 19° dry 28 — 75.8%

16:00 18° 1mm 28 — 78.9%

17:00 17° dry 30 — 88.8%

18:00 17° 0.1mm 29 — 89.2%

19:00 17° 2mm 27 — 90.7%

20:00 17° 1mm 26 — 95%

21:00 17° 0.3mm 21 — 96.3%

Mon Monday 7 September

Poor

Temp15°C

Rain7mm

Wind25 km/h

Gusts—

Humidity83%

6.5mm rain forecast

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 13° dry 18 — 93.6%

07:00 13° 0.1mm 19 — 92.8%

08:00 14° dry 22 — 90.3%

09:00 15° dry 25 — 86.6%

10:00 15° dry 26 — 82.2%

11:00 16° 0.3mm 27 — 77.7%

12:00 15° 0.3mm 27 — 78.4%

13:00 16° 0.3mm 26 — 79.1%

14:00 15° 0.2mm 24 — 82.7%

15:00 14° 0.9mm 22 — 89.3%

16:00 14° 0.7mm 24 — 92%

17:00 13° 0.7mm 20 — 94%

18:00 13° 0.5mm 16 — 92.7%

19:00 12° 0.2mm 17 — 91.4%

20:00 12° 0.7mm 17 — 91.2%

21:00 11° 0.6mm 21 — 92.3%

Tue Tuesday 8 September

Poor

Temp13°C

Rain10mm

Wind32 km/h

Gusts—

Humidity84%

9.7mm rain forecast

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 11° 1mm 32 — 91.5%

07:00 12° 0.8mm 28 — 92.4%

08:00 12° 1mm 27 — 92.9%

09:00 12° 0.3mm 26 — 93.1%

10:00 13° 0.7mm 25 — 89.8%

11:00 13° 0.5mm 30 — 85.2%

12:00 14° 0.7mm 33 — 81.3%

13:00 14° 0.8mm 33 — 77%

14:00 13° 0.7mm 34 — 85.9%

15:00 13° 0.5mm 34 — 85.8%

16:00 14° 0.1mm 34 — 83.7%

17:00 14° dry 35 — 78.5%

18:00 14° dry 30 — 74.9%

Wed Wednesday 9 September

Caution

Temp15°C

Raindry

Wind14 km/h

Gusts—

Humidity66%

Drying — 21h since rain

Good friction range for basalt
Basalt holds friction well when dry

Time °C Rain Wind (km/h) Gust Hum

06:00 10° dry 10 — 92.7%

12:00 15° dry 14 — 65.7%

18:00 14° dry 11 — 74.8%

Thu Thursday 10 September

Poor

Temp15°C

Rain0.9mm

Wind18 km/h

Gusts—

Humidity91%

0.9mm rain forecast

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry

Time °C Rain Wind (km/h) Gust Hum

06:00 12° 0.1mm 13 — 93.3%

12:00 15° 0.1mm 18 — 91.3%

18:00 16° 0.6mm 13 — 89.2%

Fri Friday 11 September

Good

Temp16°C

Rain0.1mm

Wind23 km/h

Gusts—

Humidity66%

Should be dry

Good friction range for basalt
Basalt holds friction well when dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 12° dry 18 — 93.4%

12:00 16° dry 23 — 66.3%

18:00 14° dry 18 — 71.9%

Sat Saturday 12 September

Poor

Temp15°C

Rain3mm

Wind22 km/h

Gusts—

Humidity75%

3.4mm rain forecast

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 11° dry 7 — 89.8%

12:00 15° 0.3mm 22 — 74.6%

18:00 14° 3mm 14 — 93.6%

Sun Sunday 13 September

Poor

Temp15°C

Rain0.8mm

Wind8 km/h

Gusts—

Humidity94%

0.8mm rain forecastHumidity 94% — potential fog

Good friction range for basalt
Wet basalt is slick — wait for the rock to dry

Time °C Rain Wind (km/h) Gust Hum

06:00 13° 0.2mm 3 — 99%

12:00 15° 0.2mm 8 — 93.8%

18:00 15° dry 0 — 94.1%

About Dumbarton Rock

Volcanic plug above the Clyde. Basalt is frictionless when wet but excellent friction when dry. North-facing — cool in summer with afternoon sun rounding the cliff. Quick drying in prevailing westerly. Year-round venue; March–April often the best conditions.

Region: Scotland
Rock type: Basalt
Aspect: north-facing
Altitude: 73m
Exposure: low
Seepage: low

Other crags in this region

Craig a Barns (Cave Crag)Craig a Barns (Polney Crag)Creag Dubh