Argyll and Loch Lomond
Tuesday 1 September 2026 · The Arrochar Alps, Crianlarich and Argyll hills
Why: Thunderstorm timing is inherently uncertain and may shift by several hours.
Thunderstorms are the main concern, especially on exposed summits and ridges. A noticeable westerly breeze and Persistent rain.
High-ground wind (900 m)
Westerly 15-20 mph at 900 m. Gusts reaching around 25 mph at 900 m, with locally higher values possible on the most exposed tops. Starting nearer 10 mph, then strengthening toward 15 mph later.
Walking impact
Noticeable on exposed ground, but unlikely to impede most walking.
Thunderstorms
A moderate thunderstorm risk is indicated from the morning into the afternoon. Avoid committing to exposed summits or ridges while storms are building or nearby.
Ground conditions
The ground is likely to be wet after recent rain.
Spate risk
There could be a spate risk based on forecast rainfall. Burns and unbridged crossings may rise quickly. The heaviest rain is expected early in the day. Crossing risk is expected throughout the day, continuing overnight and easing after around 03:00 the following morning. Turn back if a crossing looks unsafe.
Rain and showers
Persistent rain for much of the day. The heaviest rain is expected early in the day.
Cloud-free summits
Around 25%. Around 15% early, improving to around 25% later.
Cloud and visibility
Cloud bases mostly around 600-1500 m. Bases should tend to lift as the day goes on. Many higher summits may stay in cloud, although local or temporary breaks are possible.
Temperature and wind chill
Around 5°C at 900 m, then falling toward 5°C later, feeling like 0°C in the wind.
Freezing level
Above the summits.
Daylight
Sunrise 06:21 — Sunset 20:15 — about 13.9 hours daylight.
Overnight · 6 p.m.–9 a.m.Wild campingBetaA damp or wet night is likely, with about 3.1 mm before pack-up. 54/100Mixed · 600 m View detailsHide details
Full regional overnight outlook
Across representative hills, open-hillside camping looks mixed around 600 m (54/100). Some overnight rain is likely, so expect a damp pitch or pack-up.
Elevation reference (open ground)
- Wind / gust
- 11 / 18 mph
- Coldest
- 7.2°C
- In cloud
- Unlikely
- Condensation
- High
- Wind / gust
- 13 / 25 mph
- Coldest
- 6.8°C
- In cloud
- 94% of night
- Condensation
- High
- Wind / gust
- 15 / 29 mph
- Coldest
- 4.7°C
- In cloud
- 100% of night
- Condensation
- High
Open-hillside guidance across representative hills. Local shelter, ridges, tent design and the exact pitch can change conditions substantially. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.
Daytime · exposed rockClimbing & scramblingBetaThunder risk is around 38% in parts of the area; exposed scrambling may be a poor choice. 0/100Poor · Very poor View detailsHide details
Full regional climbing & scrambling outlook
Conditions for exposed scrambling across the area look very poor (0/100). Rain is likely to leave rock wet; polished slabs, vegetation and drainage lines may be notably worse. Mapped summit-point geology across the representative hills includes psammite, pelite or semipelite, granite, gneiss or gabbro and volcanic rock; moisture response can therefore vary substantially between crags and routes.
Representative summit-point samples across the region; individual crags and routes may differ.
Generic exposed hands-on-rock terrain across representative summits; mapped summit-point geology is a broad regional sample, not a named-route survey. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.
Updated 30 August 2026 at 04:40 UTC. See typical weekly and monthly conditions for Argyll and Loch Lomond.