Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for generally southeast flow persisting also for unsettled weather, but lowering for timing detail of worst of conditions.
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
Showers or longer periods of rain and summit sleet or snow, turning heavy at times. Fresh or strong summit winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
60% | 70% | 70% | 80% | 90% | 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 |
E
26
|
E
24
|
SE
22
|
SE
21
|
SE
19
|
SW
21
|
| 600m |
SE
15
|
SE
15
|
SE
15
|
SE
13
|
SE
14
|
S
15
|
| 300m |
SE
9
|
SE
10
|
SE
10
|
SE
8
|
SE
8
|
S
9
|
| Valley |
SE
9
|
SE
10
|
SE
10
|
SE
8
|
SE
8
|
S
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 31 | 29 | 27 | 26 | 23 | 26 |
| 600m | 23 | 21 | 20 | 18 | 18 | 19 |
| 300m | 21 | 20 | 17 | 16 | 16 | 17 |
| Valley | 21 | 20 | 18 | 16 | 15 | 17 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
2°
|
3°
|
3°
|
2°
|
| 600m |
4°
|
4°
|
5°
|
5°
|
5°
|
4°
|
| 300m |
6°
|
6°
|
7°
|
8°
|
7°
|
6°
|
| Valley |
7°
|
7°
|
8°
|
9°
|
8°
|
7°
|
| Freezing Level |
1,200m
|
1,300m
|
1,300m
|
1,400m
|
1,400m
|
1,300m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-5°
|
-5°
|
-4°
|
-3°
|
-3°
|
-3°
|
| 600m |
0°
|
-1°
|
0°
|
1°
|
0°
|
0°
|
| 300m |
3°
|
2°
|
4°
|
5°
|
4°
|
3°
|
| Valley |
4°
|
4°
|
6°
|
6°
|
5°
|
4°
|
Additional weather information
Meteorologist's view
Difficult conditions in rain, extensive hill fog, and sleet or snow across highest routes with a severe wind chill.
Weather
A cloudy to overcast day with frequent showers or longer periods of rain that turn heavy at times, particularly this afternoon, and also falling as sleet or snow over the highest summits.
Chance of cloud-free hill tops
10-20%.
Low cloud and visibility
Good becoming hazy or poor with only nearby hills visible in rain, and very poor in snow and within cloud with bases quite extensive from 300-500m at first, lifting to 500-700m this afternoon.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rather cloudy with scattered showers, these wintry across the highest summits. Some brighter spells are possible, mainly appearing through the afternoon. Summit winds moderate to fresh.
Chance of cloud-free hill tops
20% becoming 40% for the afternoon.
Maximum wind speed expected
South or southwest 15-25mph
Temperature
- At 800m Plus 3-4 Celsius
- Valley Plus 4 Celsius rising to 11 Celsius for the afternoon
- Freezing level Near to summits
Low cloud and visibility
Good becoming hazy or poor with only nearby hills visible in rain, and very poor in snow and within cloud with bases quite extensive from 300-500m at first, lifting to 500-700m through the afternoon.
Mountain weather information
Mon 9 Feb
Sunrise:
Sunset:
Rather cloudy with showers that merge to longer periods of rain later in the day. Strong southeast summit winds developing later. Freezing level above summits.
Tue 10 Feb
Sunrise:
Sunset:
Periods of rain and summit snow, heavy at times. Strong southeast summit winds. Freezing level around 1000m.
Wed 11 Feb
Sunrise:
Sunset:
Periods of rain and summit snow, heavy at times. Southeast summit winds strong at first. Freezing level around 900m.
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.