Snowdon - Yr Wyddfa1,085 m
84Good
A good day on Snowdon - Yr Wyddfa: dry, with light winds and clear tops for most of the day.
Wind14 mph WGusts 18 mph
Rain0.0 mm
Summit views94%
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
78Good
A good day on Cadair Idris - Penygadair, though expect sleet or snow up high.
Wind17 mph SWGusts 23 mph
Rain0.2 mm
Summit views95%
Pen y Fan886 m
82Good
A good day on Pen y Fan, though expect burns rising after rain.
Wind19 mph SWGusts 25 mph
Rain0.0 mm
Summit views95%
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
Moon for your challenge
Night before your chosen day: Wednesday 21 October 2026
Snowdon - Yr Wyddfa
Waxing gibbous moon
- Illuminated disc
- 80%
- Moonrise
- Outside this window
- Moonset
- 03:03 next morning BST
Moon up during darker hours18:45 BST to 03:05 BST next morning
Window: 21 Oct, 17:00 BST to 22 Oct, 08:00 BST
Cadair Idris - Penygadair
Waxing gibbous moon
- Illuminated disc
- 80%
- Moonrise
- Outside this window
- Moonset
- 03:03 next morning BST
Moon up during darker hours18:45 BST to 03:05 BST next morning
Window: 21 Oct, 17:00 BST to 22 Oct, 08:00 BST
Pen y Fan
Waxing gibbous moon
- Illuminated disc
- 80%
- Moonrise
- Outside this window
- Moonset
- 03:02 next morning BST
Moon up during darker hours18:40 BST to 03:05 BST next morning
Window: 21 Oct, 17:00 BST to 22 Oct, 08:00 BST
Night beginning Thursday 22 October 2026
Snowdon - Yr Wyddfa
Waxing gibbous moon
- Illuminated disc
- 88%
- Moonrise
- Outside this window
- Moonset
- 04:22 next morning BST
Moon up during darker hours18:40 BST to 04:25 BST next morning
Window: 22 Oct, 17:00 BST to 23 Oct, 08:00 BST
Cadair Idris - Penygadair
Waxing gibbous moon
- Illuminated disc
- 88%
- Moonrise
- Outside this window
- Moonset
- 04:22 next morning BST
Moon up during darker hours18:40 BST to 04:20 BST next morning
Window: 22 Oct, 17:00 BST to 23 Oct, 08:00 BST
Pen y Fan
Waxing gibbous moon
- Illuminated disc
- 88%
- Moonrise
- Outside this window
- Moonset
- 04:20 next morning BST
Moon up during darker hours18:40 BST to 04:20 BST next morning
Window: 22 Oct, 17:00 BST to 23 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.
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