Snowdon - Yr Wyddfa1,085 m
76Good
A good day on Snowdon - Yr Wyddfa, though expect snow on the tops.
Wind20 mph EGusts 26 mph
Rain0.2 mm
Summit views72%
Welsh Three Peaks weather forecast
Compare the mountain weather on Yr Wyddfa, Cadair Idris and Pen y Fan before choosing a day for the Welsh Three Peaks.
3 summitsThree mountains spread across Wales
Forecast comparison
Every summit is shown side by side. The combined grade gives extra weight to the weakest forecast.
SummitGradeForecast summaryWindRainSummit viewsDetails
Cadair Idris - Penygadair893 mLimiting summit
61Mixed
A mixed day on Cadair Idris - Penygadair, with snow on the tops and burns likely to be in spate.
Wind17 mph SEGusts 23 mph
Rain2.2 mm
Summit views70%
Pen y Fan886 m
62Mixed
A mixed day on Pen y Fan, with sleet or snow on the tops and cloud coming down onto the tops.
Wind21 mph SWGusts 28 mph
Rain6.1 mm
Summit views46%
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
Moon for your challenge
Night before your chosen day: Sunday 15 November 2026
Snowdon - Yr Wyddfa
Waxing crescent moon
- Illuminated disc
- 36%
- Moonrise
- Outside this window
- Moonset
- 21:11 GMT
Moon up during darker hours17:00 GMT to 21:10 GMT
Window: 15 Nov, 17:00 GMT to 16 Nov, 08:00 GMT
Cadair Idris - Penygadair
Waxing crescent moon
- Illuminated disc
- 36%
- Moonrise
- Outside this window
- Moonset
- 21:12 GMT
Moon up during darker hours17:00 GMT to 21:10 GMT
Window: 15 Nov, 17:00 GMT to 16 Nov, 08:00 GMT
Pen y Fan
Waxing crescent moon
- Illuminated disc
- 36%
- Moonrise
- Outside this window
- Moonset
- 21:14 GMT
Moon up during darker hours17:00 GMT to 21:15 GMT
Window: 15 Nov, 17:00 GMT to 16 Nov, 08:00 GMT
Night beginning Monday 16 November 2026
Snowdon - Yr Wyddfa
First-quarter moon
- Illuminated disc
- 46%
- Moonrise
- Outside this window
- Moonset
- 22:26 GMT
Moon up during darker hours17:00 GMT to 22:25 GMT
Window: 16 Nov, 17:00 GMT to 17 Nov, 08:00 GMT
Cadair Idris - Penygadair
First-quarter moon
- Illuminated disc
- 46%
- Moonrise
- Outside this window
- Moonset
- 22:27 GMT
Moon up during darker hours17:00 GMT to 22:25 GMT
Window: 16 Nov, 17:00 GMT to 17 Nov, 08:00 GMT
Pen y Fan
First-quarter moon
- Illuminated disc
- 46%
- Moonrise
- Outside this window
- Moonset
- 22:28 GMT
Moon up during darker hours17:00 GMT to 22:30 GMT
Window: 16 Nov, 17:00 GMT to 17 Nov, 08:00 GMT
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.
Planning the Welsh Three Peaks
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 information