Summit forecast and start time
1. Pick a path
2. Pick a day
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Best day this week
Our own guide, not an official rating: a weather score from the same rules of thumb as the warnings (gusts, rain, cloud, wind chill, freezing level), lowered on days that are usually busy. Busyness uses Eryri's 2025 walker counts by weekday and month, so it shows a typical pattern, not a crowd forecast. Tap a day to see it.
Sunrise hike: what time to start
- You will walk up in the dark: carry a head torch with spare batteries, and a second light. Eryri advises carrying a torch and whistle in case you are caught on a summit after dark.
- It is much colder before dawn and at the top: pack extra warm layers.
- Navigation is harder in the dark: know the path, and carry a map and compass and the skills to use them.
- Early buses may not run yet: check the first bus time, or the parking rules, before you plan the start.
- Go with others, tell someone your plan, and turn back if the weather is poor.
Hour-by-hour forecast: Yr Wyddfa summit (1,085 m)
Wind and gusts in mph. Freezing level in metres above sea level. Forecast data: Open-Meteo.
Before you go, also check the Met Office mountain forecast, MWIS and Eryri's ground conditions reports.
3. Getting there
Map
The route map (OpenStreetMap) loads when you scroll here.
How busy it gets
Read the forecast like a mountain walker
- Gusts matter more than average wind on exposed ridges.
- Freezing level below 1,085 m means snow or ice is possible at the top.
- Feels like includes wind chill.
- Cloud near 100% usually means the summit is in mist: navigation skills needed.
Stay safe
- Ask the AdventureSmart three questions: do I have the knowledge and skills, do I know what the weather will be like, and am I confident I have the right gear?
- In an emergency, dial 999 or 112, ask for the Police, then Mountain Rescue.
- Register your phone for emergency texts before you go: text register to 999.
- Do not walk on the Snowdon Mountain Railway track. Keep dogs on leads near livestock.
- Turn back if the weather turns or you are behind time. The summit will still be there.
Frequently asked questions
What is the weather like on the summit of Snowdon?
Usually much colder and windier than in the valleys. Air cools by roughly 6 to 10°C per 1,000 m, and wind chill adds to that. Check the live summit forecast above.
Where does this Snowdon forecast come from?
Open-Meteo's free weather API for the summit position at 1,085 m. For mountain-specific forecasts also check the Met Office mountain forecast and MWIS.
How windy is too windy for Snowdon?
There is no official cut-off. As our rule of thumb, gusts over 35 mph make ridges hard going and over 50 mph make walking dangerous. Turn back if in doubt.
When does it get dark on Snowdon?
The planner shows today's sunrise and sunset and works out the latest time you should start for your path and pace.
Sources
- Open-Meteo forecast API
- Met Office mountain forecast: Snowdonia
- MWIS: Snowdonia National Park
- Eryri: Yr Wyddfa ground conditions
Every figure on this page was checked against these sources on 20 October 2026.