Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High unsettled weather, but lowering for timing detail of worst of conditions. Please note we are aware of an issue affecting forecast wind speeds and gusts for higher-elevation sites (typically above 500m) displayed on the Met Office website and app. The winds shown here in our Mountain Area Forecasts are not affected by this. Our teams are actively working to correct the issue and updates will be deployed as soon as possible.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.
Mountain weather forecast
Cloudy with occasional rain and summit snow. Summit winds easing.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
80% | 80% | 80% | 80% | 70% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
S
22
|
SW
19
|
SW
23
|
SW
19
|
SW
18
|
SW
18
|
| 600m |
S
15
|
SW
14
|
SW
17
|
SW
14
|
SW
12
|
SW
13
|
| 300m |
S
10
|
S
8
|
SW
11
|
SW
9
|
SW
8
|
S
8
|
| Valley |
S
10
|
S
8
|
SW
11
|
SW
9
|
SW
8
|
S
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 26 | 24 | 28 | 24 | 22 | 23 |
| 600m | 19 | 19 | 23 | 19 | 16 | 17 |
| 300m | 18 | 17 | 19 | 16 | 14 | 16 |
| Valley | 18 | 17 | 20 | 16 | 15 | 16 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
2°
|
2°
|
1°
|
1°
|
| 600m |
4°
|
4°
|
4°
|
4°
|
3°
|
3°
|
| 300m |
5°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| Valley |
6°
|
6°
|
7°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,100m
|
1,200m
|
1,100m
|
1,100m
|
1,100m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-5°
|
-4°
|
-5°
|
-4°
|
-4°
|
-5°
|
| 600m |
-1°
|
-1°
|
-1°
|
-1°
|
-1°
|
-1°
|
| 300m |
2°
|
2°
|
2°
|
2°
|
2°
|
2°
|
| Valley |
3°
|
4°
|
4°
|
4°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Navigation will be particularly challenging in the quite extensive hill fog. Significant windchill.
Weather
Cloudy with spells of rain, this sometimes heavy, especially this morning. Above around 900m sleet and summit snow. Late this afternoon and this evening the rain is likely to ease, becoming lighter and patchy.
Chance of cloud-free hill tops
Generally 10% or less, but perhaps 40% across eastern areas this afternoon.
Low cloud and visibility
Very hazy or poor with rain, very poor with snow and hill fog, otherwise generally hazy to good with distant hills visible. Extensive low cloud above 500-600m this morning, perhaps becoming broken above 700m this afternoon across some eastern areas.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Overcast with patchy rain giving way to more persistent rain overnight, this becoming heavy at times and falling as sleet or snow above 900m. By late morning dry, clearer and brighter conditions reach the far west and then quickly move east. Staying dry through the evening with clear spells and temperatures quickly falling, and patchy mist or fog forming.
Chance of cloud-free hill tops
10% or less improving 90% or more through the afternoon.
Maximum wind speed expected
West or southwest 20-25 mph
Temperature
- At 800m Plus 1-2 Celsius
- Valley Plus 3 increasing 9 Celsius for the afternoon
- Freezing level Just above summits
Low cloud and visibility
Very hazy or poor with rain, very poor with snow and hill fog, otherwise generally hazy to good with distant hills visible then improving very good or excellent with visible hills clearly visible. Extensive low cloud above 400-500m quickly clearing through the afternoon.
Mountain weather information
Mon 2 Feb
Sunrise:
Sunset:
Patchy light rain and summit snow. Widespread hill fog. Strong to gale summit winds. Freezing level 900-1000 metres.
Tue 3 Feb
Sunrise:
Sunset:
Spells of rain and summit snow. Widespread hill fog. Strong east or southeast summit winds. Freezing level 900 metres.
Wed 4 Feb
Sunrise:
Sunset:
Probably occasional rain and summit snow. Widespread hill fog. Strong to gale east or southeast summit winds. Freezing level 900 metres.
Updated at:
Summit specific forecast
Mountain summit forecast map
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Key
Mountain summits
Other points of interest
Cluster of multiple stations
The Eryri (Snowdonia) mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Yr Wyddfa (Snowdon), standing at 1,085 metres.