Compare Cairn Gorm, Ben Macdui, Cairn Toul, Sgòr an Lochain Uaine and Braeriach in one forecast view.
Every summit is shown side by side. The combined grade gives extra weight to the weakest forecast.
Serious conditions on Cairn Gorm, with strong, gusty winds and the summit in cloud for most of the day.
Serious conditions on Ben Macdui, with the summit in cloud for most of the day and a blustery wind.
Serious conditions on Cairn Toul, with strong, gusty winds and the summit in cloud for most of the day.
Serious conditions on Sgòr an Lochain Uaine, with strong, gusty winds and the summit in cloud for most of the day.
Serious conditions on Braeriach, with strong, gusty winds and the summit in cloud for most of the day.
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
Area reference: Ben Macdui. Local mountain horizons will vary.
Waxing gibbous moon
Moon up during darker hours18:40 BST to 00:05 BST next morning
Window: 19 Oct, 17:00 BST to 20 Oct, 08:00 BST
Area reference: Ben Macdui. Local mountain horizons will vary.
Waxing gibbous moon
Moon up during darker hours18:40 BST to 01:30 BST next morning
Window: 20 Oct, 17:00 BST to 21 Oct, 08:00 BST
Approximate times in UK local time, for an open horizon. Moon-up periods are rounded to five minutes. Hills and cloud can hide the Moon. Illumination is the sunlit percentage of its disc, not how bright your route will be. Darker hours here begin after civil twilight. This almanac covers only the stated overnight window and does not change the weather grade. Take a headtorch and spare power regardless.
The Cairngorms 4000s links five of Britain’s highest summits across a remote, exposed plateau and the Lairig Ghru. Even when the general pattern is settled, cloud, wind and temperature can differ across this large mountain area.
Use the challenge grade to compare dates, then inspect all five rows. The forecast does not account for river crossings, snow cover, navigation or the very substantial distance between summits.
Read Cairngorms 4000s route context