Compare the mountain weather on Yr Wyddfa, Cadair Idris and Pen y Fan before choosing a day for the Welsh Three Peaks.
Every summit is shown side by side. The combined grade gives extra weight to the weakest forecast.
A rough, clagged-in day on Snowdon - Yr Wyddfa: summit wind broadly 25-40 mph, with gusts 45-55 mph during the afternoon (gale-force winds).
A mixed day on Cadair Idris - Penygadair: summit wind broadly 20-35 mph, with gusts 35-45 mph during the morning (gale-force winds).
A mixed day on Pen y Fan: summit wind broadly 20-35 mph, with gusts 35-45 mph around midday (strong winds).
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
The Welsh Three Peaks Challenge links three iconic mountains across north, mid and south Wales. Because the summits are widely separated, the forecast can vary far more than a single Wales-wide weather summary suggests.
Treat the combined grade as a quick comparison, then read each mountain row. A good forecast on one summit does not imply similar wind, cloud or rain on the other two.
Read Welsh Three Peaks route informationBalance 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.
The Welsh Three Peaks spans north and south Wales. Look at both regional patterns, then check the separate live summit forecasts close to your trip. The Eryri sample is at Yr Wyddfa, so it is only broad context for Cadair Idris.
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 months.
Sample: Snowdon / Yr Wyddfa, 1,085 m.
Snowdon - Yr Wyddfa, Cadair Idris - Penygadair. Shared regional context does not imply identical summit conditions.
57% settled rain/wind in this area's strongest May-to-September month.
Sample: Pen y Fan, 886 m.
Pen y Fan. 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.