Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
A changeable week with significant temperature variation. High for general developments. Medium for cloud details.
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.
Mountain weather forecast
Dry and bright. Strengthening winds later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
00% | 00% | 00% | <05% | 20% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NE
6
|
S
9
|
SW
16
|
SW
25
|
SW
37
|
SW
37
|
| 600m |
S
5
|
S
8
|
SW
14
|
SW
19
|
SW
23
|
SW
24
|
| 300m |
NW
2
|
S
3
|
SW
9
|
S
13
|
S
15
|
SW
16
|
| Valley |
SW
2
|
S
3
|
SW
9
|
SW
12
|
S
14
|
SW
16
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 7 | 11 | 20 | 31 | 45 | 46 |
| 600m | 6 | 10 | 18 | 25 | 30 | 33 |
| 300m | 3 | 5 | 14 | 21 | 27 | 29 |
| Valley | 3 | 5 | 13 | 20 | 26 | 29 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
3°
|
4°
|
4°
|
3°
|
| 600m |
3°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| 300m |
4°
|
7°
|
9°
|
9°
|
8°
|
7°
|
| Valley |
5°
|
8°
|
10°
|
10°
|
9°
|
9°
|
| Freezing Level |
900m
|
1,000m
|
1,200m
|
1,300m
|
1,300m
|
1,700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-1°
|
-1°
|
-2°
|
-2°
|
-4°
|
-4°
|
| 600m |
1°
|
2°
|
2°
|
1°
|
0°
|
-1°
|
| 300m |
3°
|
6°
|
7°
|
6°
|
4°
|
3°
|
| Valley |
4°
|
7°
|
8°
|
8°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
Early frost possible in the valleys. Strong gusty winds likely on summits and exposed ridges by the evening.
Weather
Dry with clear spells overnight, perhaps some mist or freezing fog in the valleys by dawn. Any mist or freezing fog clearing during the morning and staying dry and bright for much of the day, although high level cloud at times. Patchy light rain possible in the evening with some cloud developing over the summits.
Chance of cloud-free hill tops
90%, falling 40% in the evening.
Low cloud and visibility
Generally no significant low cloud, but cloud could develop around the summits during the evening. Visibility mostly very good or excellent, except in valley mist and fog, and summit cloud later.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloud thickening and lowering overnight with outbreaks of rain. Remaining cloudy during daylight hours with outbreaks of rain, the rain heavy and persistent at times. Strong to gale force summit winds and buffeting. Cloud lifting and breaking during the evening with showers turning wintry over the summits.
Chance of cloud-free hill tops
20% rising to 60% in the evening.
Maximum wind speed expected
Southwest 30 to 40mph gusting 60mph.
Temperature
- At 800m Plus 4 Celsius, falling to Plus 1 Celsius later.
- Valley Plus 6 to 13 Celsius
- Freezing level Above the summits, falling to around 900m later.
Low cloud and visibility
Extensive low cloud much of daylight hours, base 300 to 600m, lifting and breaking towards the summits in the evening. Visibility often moderate to very poor.
Mountain weather information
Wed 25 Mar
Sunrise:
Sunset:
Cloudy or bright with wintry showers. Strong to gale force northwest winds at height with a severe wind chill. Freezing level 300 to 600m.
Thu 26 Mar
Sunrise:
Sunset:
Cloudy or bright with wintry showers. Fresh to strong northwest winds at height with a significant winds chill. Freezing most levels, rising to around the summits during the day.
Fri 27 Mar
Sunrise:
Sunset:
Overnight rain, with snow at first at height. Rain during the morning with drier and brighter spells developing through the afternoon. Southwest becoming northwest winds, fresh to strong at times. Freezing level near or above the summits.
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.