Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for east to southeast flow persisting also for quite unsettled, but lowering for timing detail of worst of conditions.
This evening forecast
Patchy rain and summit snow focused in east, turning more persistent late evening with the chance of some heavier outbreaks developing. Very cold at height in strong, perhaps gale, easterly summit winds and a freezing level around 1100m.
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 | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
70% | 70% | 60% | 60% | 60% | 60% | 70% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
E
28
|
E
26
|
E
18
|
SE
14
|
S
11
|
SW
12
|
SW
12
|
SW
13
|
| 600m |
E
18
|
E
13
|
E
9
|
SE
9
|
S
9
|
SW
9
|
W
8
|
SW
9
|
| 300m |
E
11
|
E
7
|
NE
6
|
E
6
|
S
7
|
W
7
|
SW
5
|
SW
5
|
| Valley |
E
11
|
E
7
|
NE
5
|
E
6
|
S
7
|
SW
7
|
SW
5
|
SW
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m | 35 | 32 | 25 | 19 | 15 | 16 | 15 | 17 |
| 600m | 24 | 20 | 15 | 15 | 13 | 13 | 11 | 12 |
| 300m | 22 | 16 | 11 | 12 | 12 | 11 | 9 | 10 |
| Valley | 22 | 16 | 10 | 12 | 12 | 12 | 9 | 10 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
1°
|
1°
|
2°
|
1°
|
1°
|
1°
|
| 600m |
4°
|
3°
|
3°
|
3°
|
4°
|
4°
|
3°
|
3°
|
| 300m |
6°
|
6°
|
5°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| Valley |
7°
|
6°
|
6°
|
6°
|
7°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,200m
|
1,200m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-5°
|
-5°
|
-5°
|
-3°
|
-2°
|
-3°
|
-3°
|
-4°
|
| 600m |
-2°
|
-1°
|
0°
|
0°
|
1°
|
0°
|
0°
|
0°
|
| 300m |
2°
|
3°
|
3°
|
2°
|
3°
|
4°
|
3°
|
3°
|
| Valley |
4°
|
4°
|
4°
|
4°
|
5°
|
5°
|
5°
|
4°
|
Additional weather information
Meteorologist's view
Navigation particularly challenging in the quite extensive hill fog across the east of the part.
Weather
Rather cloudy with occasional spells of rain and above around 900m snow, which will be focused in the east, though there may be a few brighter spells breaking through for western areas for the afternoon.
Chance of cloud-free hill tops
25% in east, 40% in west
Low cloud and visibility
Good or very good, becoming moderate or poor in rain, very poor within cloud with bases quiet extensive from 700m in the east
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy with further outbreaks of rain, and above around 900m snow, most persistent late in the day. Moderate to fresh summit winds.
Chance of cloud-free hill tops
20%
Maximum wind speed expected
West or southwest 15-20mph
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
Good becoming moderate or poor in rain, very poor in snow and within cloud with bases quiet extensive from 600m
Mountain weather information
Mon 2 Feb
Sunrise:
Sunset:
Patchy light rain and summit snow. Strong to gale summit winds. Freezing level 900-1000 metres.
Tue 3 Feb
Sunrise:
Sunset:
Occasional rain and summit snow. Strong east or southeast summit winds. Freezing level 900 metres.
Wed 4 Feb
Sunrise:
Sunset:
Occasional rain and summit snow. 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.