Argyll and Loch Lomond Mountain Weather Forecast

Mountain Weather brief

Argyll and Loch Lomond

Saturday 29 August 2026 · The Arrochar Alps, Crianlarich and Argyll hills

Confidence: Medium

Why: Rain could reach the main walking period or hold off until later; forecast models disagree on the timing.

What matters most

A risk of patchy rain or drizzle. Light easterly wind, with many tops staying clear.

High-ground wind · 900 m5 mph easterly Gusts · 900 m10 mph Cloud base1200-1500 m Feels like · 900 m8°C

Morning · 07:00–13:00ExcellentRain timing remains uncertain.

90/100

Afternoon & evening · 13:00–22:00ExcellentRain timing remains uncertain.

88/100

Conservative regional grades across representative summits, so one sheltered hill does not overstate the wider area.

High-ground wind (900 m)

Easterly around 5 mph at 900 m. Gusts reaching around 10 mph at 900 m, with locally higher values possible on the most exposed tops. Little overall change through the day.

Walking impact

Little effect on walking, although exposed tops may still feel chilly.

Thunderstorms

Thunderstorms are possible from late afternoon into the evening. 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 85%.

Cloud and visibility

Cloud bases mostly around 1200-1500 m. Bases should tend to lift as the day goes on. Cloud bases are likely to remain high, but some forecast models are much cloudier, so more extensive summit cloud remains a credible outcome. Many higher summits should stay clear, with useful views for much of the day.

Temperature and wind chill

Around 10°C at 900 m, feeling like 8°C in the wind.

Freezing level

Above the summits.

Daylight

Sunrise 06:15 — Sunset 20:23 — about 14.1 hours daylight.

Overnight · 6 p.m.–9 a.m.Wild campingBetaA damp or wet night is likely, with about 10.6 mm before pack-up. 62/100Mixed · 600 m View detailsHide details

Regional night beginning Saturday 29 August 2026

Full regional overnight outlook

Across representative hills, open-hillside camping looks mixed around 600 m (62/100). A wet night is likely, with around 11 mm indicated between pitching and packing up.

Overnight rain11 mmOpen ground · 600 m8 mph · gusts 18 mphMorning pack-upDampness possible

Elevation reference (open ground)

300 m64/100 · mixed

Wind / gust: 7 / 15 mph
Coldest: 11.1°C
In cloud: Unlikely
Condensation: High

600 m62/100 · mixed

Wind / gust: 8 / 18 mph
Coldest: 10.3°C
In cloud: 48% of night
Condensation: High

900 m62/100 · mixed

Wind / gust: 10 / 21 mph
Coldest: 8.5°C
In cloud: 48% of night
Condensation: High

Open-hillside guidance across representative hills. Local shelter, ridges, tent design and the exact pitch can change conditions substantially. How to use the wild-camping forecast.

Daytime · exposed rockClimbing & scramblingBetaThunder risk is around 27% in parts of the area; exposed scrambling may be a poor choice. 94/100Excellent · Excellent View detailsHide details

Across representative exposed-rock terrain

Full regional climbing & scrambling outlook

Conditions for exposed scrambling across the area look excellent (94/100). The broad weather signal favours dry rock, though local seepage and shaded holds remain unresolved. 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.

Rock surfaceProbably dryExposed gust9 mphRainPossible · 82%

Mapped rock across sampled summits3 broad familiesRepresentative summit samples

psammite, pelite or semipelite 50% 4 representative summitsDry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.granite, gneiss or gabbro 25% 2 representative summitsGenerally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.volcanic rock 25% 2 representative summitsOften grippy when dry, but volcanic rocks vary widely; wet lichen, smooth holds and local seepage can still make them slippery.

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 29 August 2026 at 04:40 UTC. See typical weekly and monthly conditions for Argyll and Loch Lomond.

Argyll and Loch Lomond mountain weather forecast.