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.
A grey, cloudy day on Cairn Gorm: summit wind broadly 20-30 mph, with gusts 35-45 mph during the evening (strong winds).
A grey, cloudy day on Ben Macdui: summit wind broadly 20-30 mph, with gusts 30-40 mph during the evening (strong winds).
A grey, cloudy day on Cairn Toul: summit wind broadly 20-30 mph, with gusts 35-45 mph during the evening (strong winds).
A grey, cloudy day on Sgòr an Lochain Uaine: summit wind broadly 20-30 mph, with gusts 35-45 mph during the evening (strong winds).
A grey, cloudy day on Braeriach: summit wind broadly 20-30 mph, with gusts 35-45 mph during the evening (strong winds).
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
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 contextBalance the historical rain-and-wind pattern with daylight, snow and the demands of the route. This is seasonal context, not a forecast for your chosen date.
These months have the highest average share of settled rain-and-wind days across the challenge's represented areas within our May-to-September planning comparison. Small percentage differences are not a reliable reason to choose one week over another.
For the Cairngorms 4000s, daylight and remaining snow deserve particular attention. All five summits are above 1,200 m, and the long plateau crossings make a regional rain-and-wind percentage only one part of choosing a date.
Green bars mark May to September. Percentages measure rain and gusts only, not sunshine, cloud-free summits, snow conditions or safety.
48% settled rain/wind in this area's strongest May-to-September month.
Sample: Cairn Gorm, 1,245 m.
Cairn Gorm, Ben Macdui, Cairn Toul, Sgòr an Lochain Uaine, Braeriach. Shared regional context does not imply identical summit conditions.
Based on our ERA5-derived regional mountain climate summaries, 1986 to 2025. Each distinct area counts once, so several peaks sharing a sample do not multiply its influence. These monthly summaries do not measure how often all summits were settled on the same day. Explore the mountain climate guide.
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.