Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for occasionally unsettled from Thursday with an east to southeast flow throughout, but lowering for timing detail of worst of conditions.
This evening forecast
Periods of rain and snow, occasionally turning heavy. Cold at height in fresh to strong easterly summit winds. Freezing level 800m.
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
Mainly dry with some brighter spells. Cold in fresh to strong 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% | 50% | 30% | 30% | 20% | 20% | 20% | 20% |
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
15
|
SE
15
|
SE
16
|
SE
22
|
SE
27
|
E
30
|
E
31
|
E
36
|
| 600m |
SE
14
|
SE
12
|
SE
13
|
SE
14
|
SE
18
|
SE
20
|
E
20
|
E
23
|
| 300m |
SE
11
|
SE
9
|
SE
9
|
SE
10
|
SE
13
|
SE
15
|
E
14
|
E
16
|
| Valley |
SE
11
|
SE
10
|
SE
9
|
SE
11
|
SE
12
|
SE
15
|
SE
13
|
SE
16
|
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 | 19 | 18 | 20 | 27 | 33 | 37 | 40 | 47 |
| 600m | 19 | 16 | 18 | 21 | 25 | 28 | 29 | 33 |
| 300m | 20 | 17 | 17 | 20 | 21 | 27 | 27 | 31 |
| Valley | 20 | 17 | 18 | 20 | 21 | 27 | 26 | 29 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
0°
|
1°
|
1°
|
0°
|
0°
|
1°
|
1°
|
0°
|
| 600m |
3°
|
3°
|
3°
|
3°
|
3°
|
3°
|
3°
|
3°
|
| 300m |
3°
|
4°
|
4°
|
4°
|
5°
|
6°
|
5°
|
5°
|
| Valley |
4°
|
5°
|
5°
|
5°
|
7°
|
8°
|
6°
|
6°
|
| Freezing Level |
1,100m
|
1,100m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-6°
|
-5°
|
-5°
|
-6°
|
-7°
|
-7°
|
-7°
|
-8°
|
| 600m |
-2°
|
-1°
|
-1°
|
-2°
|
-2°
|
-2°
|
-2°
|
-4°
|
| 300m |
-1°
|
0°
|
0°
|
0°
|
2°
|
2°
|
1°
|
0°
|
| Valley |
0°
|
1°
|
1°
|
2°
|
3°
|
4°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Gusts may be 10-15mph higher than the figures stated above at higher levels.
Weather
Periods of rain and summit snow at first overnight, with outbreaks turning light and patchy before dawn. A mainly dry day with only a few light showers appearing, these wintry across highest peaks. Some brighter spells developing, particularly for the afternoon and in the west of the Park.
Chance of cloud-free hill tops
By day 40% becoming 60% for the afternoon
Low cloud and visibility
Moderate or poor in rain, very poor in snow and within cloud with bases most extensive from 700m early in the day.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Periods of rain and summit snow, turning heavy at times, combining with summit gales to bring very challenging conditions.
Chance of cloud-free hill tops
10-20%
Maximum wind speed expected
Easterly 35-45 mph with gusts reaching 50-60mph across more exposed ridges and summits.
Temperature
- At 800m Zero to plus 1 Celsius
- Valley Plus 5 rising to 8 Celsius for the afternoon
- Freezing level 800-1000m by day
Low cloud and visibility
Moderate or poor in rain, very poor in snow and within cloud with bases quite extensive from around 700m.
Mountain weather information
Fri 6 Feb
Sunrise:
Sunset:
Periods of rain and summit snow, occasionally heavy. Strong easterly summit winds.
Sat 7 Feb
Sunrise:
Sunset:
Showers or longer periods of rain and summit snow. Fresh to strong east to southeast summit winds.
Sun 8 Feb
Sunrise:
Sunset:
Occasional rain, most persistent in the east. Fresh to strong southeasterly summit winds.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.