Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for east to southeast flow persisting also for occasionally unsettled, but lowering for timing detail of worst of conditions.
This evening forecast
Periods of snow, and at lower levels rain, turning heavy at times. Cold in gale to severe gale summit winds.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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
West seeing best of shelter with scattered showers focused in east. Cold in fresh summit winds.
| 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) |
90% | 80% | 40% | 20% | 20% | 20% | 30% | 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 |
SE
47
|
SE
40
|
SE
34
|
SE
31
|
SE
25
|
SE
24
|
E
31
|
E
34
|
| 600m |
SE
30
|
SE
24
|
SE
21
|
SE
20
|
S
17
|
SE
15
|
E
18
|
E
22
|
| 300m |
SE
22
|
SE
18
|
SE
14
|
SE
13
|
SE
12
|
SE
10
|
E
12
|
E
15
|
| Valley |
SE
22
|
SE
17
|
SE
14
|
SE
13
|
SE
12
|
SE
10
|
E
12
|
E
14
|
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 | 56 | 48 | 41 | 37 | 31 | 30 | 38 | 41 |
| 600m | 39 | 33 | 28 | 27 | 23 | 21 | 27 | 31 |
| 300m | 39 | 32 | 26 | 24 | 20 | 19 | 25 | 28 |
| Valley | 39 | 32 | 26 | 23 | 20 | 18 | 24 | 27 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-2°
|
-1°
|
0°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| 600m |
1°
|
1°
|
2°
|
3°
|
4°
|
4°
|
4°
|
3°
|
| 300m |
3°
|
3°
|
4°
|
5°
|
6°
|
7°
|
6°
|
5°
|
| Valley |
4°
|
4°
|
5°
|
6°
|
8°
|
8°
|
7°
|
6°
|
| Freezing Level |
600m
|
900m
|
1,100m
|
1,100m
|
1,100m
|
1,000m
|
1,000m
|
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 |
-12°
|
-11°
|
-8°
|
-7°
|
-5°
|
-5°
|
-6°
|
-7°
|
| 600m |
-7°
|
-6°
|
-4°
|
-3°
|
-1°
|
0°
|
-2°
|
-3°
|
| 300m |
-3°
|
-2°
|
-1°
|
1°
|
3°
|
4°
|
2°
|
1°
|
| Valley |
-1°
|
0°
|
1°
|
2°
|
5°
|
6°
|
3°
|
3°
|
Additional weather information
Meteorologist's view
Low cloud will make for navigational difficulties in the east.
Weather
Periods of occasionally heavy snow at first overnight, rain at lower levels. Breaking to only a few scattered showers towards dawn as the snow level lifts to become confined to the highest routes. Only a few scattered light showers through the day, with best of the limited brighter spells developing across the west of the park. Cloud and patchy rain feeding from the south for the evening.
Chance of cloud-free hill tops
By day 60% in west 30% in east
Low cloud and visibility
Moderate or poor in rain, very poor in snow and within cloud with bases quite extensive from around 600m across eastern areas of the Park.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rather cloudy start with some patchy light rain and summit sleet which will be focused in the east, though there will be an increasing chance of brighter spells breaking through for the afternoon. Summit winds fresh to strong at first.
Chance of cloud-free hill tops
Beginning 30% in east, 50% in west becoming 60% in east, 75% in west late in day
Maximum wind speed expected
Easterly 20-25 mph easing from mid-morning
Temperature
- At 800m Plus 2-3 Celsius
- Valley Plus 5 rising to 10 Celsius
- Freezing level 1000-1100 metres
Low cloud and visibility
Good or very good, becoming moderate or poor in rain, very poor within cloud with bases quiet extensive from 600m in the east
Mountain weather information
Sun 1 Feb
Sunrise:
Sunset:
Mainly dry and partly cloudy. Light winds. Freezing level 1000 metres.
Mon 2 Feb
Sunrise:
Sunset:
Rather cloudy with some patchy light rain and summit snow. Gale to severe gale summit winds. Freezing level 900 metres.
Tue 3 Feb
Sunrise:
Sunset:
Occasional rain and summit snow. Fresh or strong 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.