Mountain weather
Forecasts for the UK’s most popular mountains and national parks. Summit conditions can differ wildly from the valley — expect the top to be around 6–10°C colder, with far stronger winds.
≤ 0°1–10°11–15°16–20°21°+
Sources
Summit conditions are serious business
Summit temperatures are estimated from the valley forecast using the standard lapse rate (−6.5°C per 1,000 m); wind chill on an exposed ridge will feel far colder, and wind speeds are typically two to three times stronger than in the glen. Always check an official mountain forecast before heading up, carry a map and compass, and turn back if the cloud comes down.