Lewis and Harris
Monday 31 August 2026 · The Harris hills and Clisham
Why: A low thunderstorm risk remains difficult to time precisely.
A risk of patchy rain or drizzle. A noticeable westerly breeze, with cloud coming and going on the tops.
High-ground wind (700 m)
Westerly around 20 mph at 700 m. Gusts reaching around 30 mph at 700 m, with locally higher values possible on the most exposed tops. Temporarily strongest around midday, near 20 mph.
Walking impact
Noticeable on exposed ground, but unlikely to impede most walking.
Thunderstorms
Thunderstorms are possible during the morning. Keep an escape route from exposed ridges and descend if thunder develops.
Rain and showers
Likely to be mostly dry, but patchy rain or drizzle remains possible. Forecast models disagree on whether and when it may arrive.
Cloud-free summits
Around 35%. Around 20% early, improving to around 60% later.
Cloud and visibility
Cloud bases mostly around 600-700 m. Bases should tend to lift as the day goes on. Cloud is likely to come and go on the higher summits; breaks may be useful but not dependable.
Temperature and wind chill
Around 8°C at 700 m, feeling like 4°C in the wind.
Freezing level
Above the summits.
Daylight
Sunrise 06:24 — Sunset 20:29 — about 14.1 hours daylight.
Overnight · 6 p.m.–9 a.m.Wild campingBetaA damp or wet night is likely, with about 11.4 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). A wet night is likely, with around 11 mm indicated between pitching and packing up.
Elevation reference (open ground)
- Wind / gust
- 7 / 14 mph
- Coldest
- 8.1°C
- In cloud
- Unlikely
- Condensation
- High
- Wind / gust
- 9 / 17 mph
- Coldest
- 7.1°C
- In cloud
- 56% 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 25% in parts of the area; exposed scrambling may be a poor choice. 20/100Poor · Poor View detailsHide details
Full regional climbing & scrambling outlook
Conditions for exposed scrambling across the area look poor (20/100). Some rock may remain damp or incompletely dried, especially in shade and seepage lines. Gusts may reach about 30 mph on exposed ground, making crosswinds an important route consideration. Mapped summit-point geology across the representative hills includes granite, gneiss or gabbro; 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 Lewis and Harris.