Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High
This evening forecast
Heavy rain and gale or severe southwesterly gales at height.
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.
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.
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
Bright spells and showers, wintry over the summits. Windy and cold.
| 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) |
30% | 30% | 40% | 30% | 40% | 30% | 30% | 30% |
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 |
SW
45
|
W
42
|
W
39
|
W
36
|
W
32
|
W
32
|
SW
37
|
SW
41
|
| 600m |
SW
28
|
SW
27
|
W
26
|
W
25
|
W
25
|
SW
24
|
SW
23
|
SW
26
|
| 300m |
SW
17
|
SW
17
|
W
17
|
W
18
|
W
18
|
SW
17
|
SW
14
|
SW
17
|
| Valley |
SW
17
|
SW
17
|
W
17
|
W
18
|
W
18
|
SW
17
|
SW
13
|
SW
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 | 53 | 50 | 47 | 44 | 40 | 40 | 45 | 50 |
| 600m | 35 | 34 | 33 | 33 | 32 | 32 | 31 | 36 |
| 300m | 31 | 30 | 30 | 30 | 30 | 29 | 27 | 33 |
| Valley | 31 | 30 | 30 | 30 | 30 | 29 | 26 | 31 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
3°
|
1°
|
0°
|
0°
|
0°
|
1°
|
1°
|
1°
|
| 600m |
5°
|
3°
|
2°
|
2°
|
3°
|
4°
|
4°
|
3°
|
| 300m |
8°
|
6°
|
5°
|
5°
|
6°
|
7°
|
6°
|
6°
|
| Valley |
9°
|
7°
|
6°
|
7°
|
8°
|
9°
|
8°
|
7°
|
| Freezing Level |
1,200m
|
900m
|
800m
|
800m
|
800m
|
900m
|
900m
|
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 |
-5°
|
-8°
|
-9°
|
-9°
|
-8°
|
-6°
|
-7°
|
-8°
|
| 600m |
-1°
|
-3°
|
-4°
|
-4°
|
-4°
|
-2°
|
-2°
|
-3°
|
| 300m |
4°
|
1°
|
0°
|
0°
|
1°
|
3°
|
2°
|
2°
|
| Valley |
6°
|
3°
|
2°
|
2°
|
4°
|
5°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Note summit gales and severe wind chill.
Weather
Cloudy or bright with showers, the showers wintry over the summits. Summit gales with a severe wind chill.
Chance of cloud-free hill tops
70%, but lowering significantly in showers.
Low cloud and visibility
Cloud mainly near or above the summits, lowering significantly in showers. Visibility mostly very good or excellent, but moderate to very poor in showers and cloud.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Patchy rain or showers overnight, then outbreaks of heavy and persistent rain during daylight hours, perhaps thundery at times. Stormy at height with severe wind chill and buffeting. Turning more showery during the evening, the showers becoming wintry over the summits.
Chance of cloud-free hill tops
20% rising to 60% later in the evening.
Maximum wind speed expected
Southwest 50mph gusting 70mph or more, severe wind chilly and buffeting.
Temperature
- At 800m Plus 4 Celsius, falling Zero Celsius later
- Valley Plus 5 to 12 Celsius
- Freezing level Mainly above the summits, later falling to 800m later.
Low cloud and visibility
Extensive low cloud, base 400 to 700m, lifting and breaking during the evening. Visibility mostly moderate to very poor, becoming generally good or very good later in the evening.
Mountain weather information
Fri 13 Mar
Sunrise:
Sunset:
Bright spells and wintry showers. Fresh to strong west or southwest winds at height with a severe wind chill. Freezing level typically 600m, but could be lower at times, particularly later in the day.
Sat 14 Mar
Sunrise:
Sunset:
The wintry showers well scattered overnight and during the morning with bright or clear spells. The wintry showers then becoming more widespread through the afternoon and evening. Moderate to fresh west or southwest winds at height with a significant wind chill. Feeling level typically 600 to 800m.
Sun 15 Mar
Sunrise:
Sunset:
Occasional rain and summit snow then wintry showers. Strong west or southwest winds with a significant wind chill. Freezing level typically around the summits, but could be lower early and later in the period.
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.