Snowdon - Yr Wyddfa1,085 mLimiting summit
48Poor
A poor day on the tops of Snowdon - Yr Wyddfa, with sleet or snow up high.
Wind34 mph SWGusts 45 mph
Rain4.8 mm
Summit views82%
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 m
54Mixed
A mixed day on Cadair Idris - Penygadair, with rain arriving in the early afternoon and burns rising after rain.
Wind34 mph SWGusts 45 mph
Rain8.1 mm
Summit views84%
Pen y Fan886 m
56Mixed
A mixed day on Pen y Fan, with rain arriving in the early afternoon.
Wind35 mph SWGusts 46 mph
Rain6.9 mm
Summit views89%
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
Moon for your challenge
Night before your chosen day: Friday 23 October 2026
Snowdon - Yr Wyddfa
Waxing gibbous moon
- Illuminated disc
- 94%
- Moonrise
- Outside this window
- Moonset
- 05:44 next morning BST
Moon up during darker hours18:40 BST to 05:45 BST next morning
Window: 23 Oct, 17:00 BST to 24 Oct, 08:00 BST
Cadair Idris - Penygadair
Waxing gibbous moon
- Illuminated disc
- 94%
- Moonrise
- Outside this window
- Moonset
- 05:43 next morning BST
Moon up during darker hours18:40 BST to 05:45 BST next morning
Window: 23 Oct, 17:00 BST to 24 Oct, 08:00 BST
Pen y Fan
Waxing gibbous moon
- Illuminated disc
- 94%
- Moonrise
- Outside this window
- Moonset
- 05:40 next morning BST
Moon up during darker hours18:40 BST to 05:40 BST next morning
Window: 23 Oct, 17:00 BST to 24 Oct, 08:00 BST
Night beginning Saturday 24 October 2026
Snowdon - Yr Wyddfa
Near-full moon
- Illuminated disc
- 98%
- Moonrise
- Outside this window
- Moonset
- 06:09 next morning GMT
Moon up during darker hours18:35 BST to 06:10 GMT next morning
Window: 24 Oct, 17:00 BST to 25 Oct, 08:00 GMT
Cadair Idris - Penygadair
Near-full moon
- Illuminated disc
- 98%
- Moonrise
- Outside this window
- Moonset
- 06:07 next morning GMT
Moon up during darker hours18:35 BST to 06:10 GMT next morning
Window: 24 Oct, 17:00 BST to 25 Oct, 08:00 GMT
Pen y Fan
Near-full moon
- Illuminated disc
- 98%
- Moonrise
- Outside this window
- Moonset
- 06:03 next morning GMT
Moon up during darker hours18:35 BST to 06:05 GMT next morning
Window: 24 Oct, 17:00 BST to 25 Oct, 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