Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for Thursday. High for changeable weather to continue into next week. Low confidence for extent of precipitation on Saturday.
This evening forecast
Dry with patchy cloud. Strong southwesterly 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
Windy with showers or occasionally longer spells of rain
| 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) |
20% | 20% | 30% | 60% | 60% | 30% | 20% | 10% |
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
43
|
SW
42
|
SW
40
|
SW
37
|
SW
36
|
SW
35
|
SW
36
|
SW
33
|
| 600m |
SW
29
|
SW
28
|
SW
28
|
SW
27
|
SW
27
|
SW
25
|
SW
26
|
SW
23
|
| 300m |
SW
19
|
SW
18
|
SW
18
|
SW
18
|
SW
19
|
SW
18
|
SW
18
|
SW
17
|
| Valley |
SW
20
|
SW
19
|
SW
19
|
SW
19
|
SW
18
|
SW
19
|
SW
20
|
SW
18
|
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 | 58 | 57 | 55 | 53 | 52 | 50 | 51 | 47 |
| 600m | 43 | 43 | 42 | 42 | 43 | 41 | 40 | 37 |
| 300m | 37 | 37 | 36 | 37 | 37 | 36 | 35 | 32 |
| Valley | 37 | 37 | 37 | 35 | 34 | 36 | 37 | 34 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
3°
|
3°
|
3°
|
2°
|
2°
|
1°
|
1°
|
1°
|
| 600m |
6°
|
6°
|
5°
|
5°
|
4°
|
4°
|
4°
|
4°
|
| 300m |
8°
|
8°
|
8°
|
7°
|
7°
|
6°
|
6°
|
6°
|
| Valley |
10°
|
9°
|
9°
|
9°
|
9°
|
8°
|
8°
|
8°
|
| Freezing Level |
1,200m
|
1,200m
|
1,200m
|
1,200m
|
1,100m
|
900m
|
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 |
-4°
|
-5°
|
-5°
|
-5°
|
-6°
|
-6°
|
-7°
|
-6°
|
| 600m |
0°
|
0°
|
0°
|
-1°
|
-2°
|
-2°
|
-3°
|
-2°
|
| 300m |
4°
|
4°
|
4°
|
3°
|
2°
|
2°
|
2°
|
2°
|
| Valley |
6°
|
6°
|
6°
|
5°
|
5°
|
4°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Strong winds will make for slow progress at height, and temporary drenching conditions in rain. Be prepared for wind chill.
Weather
Often cloudy with occasional showers until late afternoon. These will be occasionally heavy and may merge into some longer spells of rain at times, and sleet or wet snow possible on the very highest summits. Drier and clearer weather will spread from the west from late afternoon onwards.
Chance of cloud-free hill tops
60%
Low cloud and visibility
Mostly good visibility with patchy cloud above 800 metres, occasionally lowering to 650 metres as showers pass by.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy with rain during the morning, occasionally heavy with some sleet or wet snow falling above 600 metres. Drier and eventually clearer weather will spread from the west during the afternoon to leave a dry evening. Strong northwesterly winds setting in during the afternoon and evening with higher summit gales leading to significant wind chill.
Chance of cloud-free hill tops
50%, best chance in the afternoon
Maximum wind speed expected
Northwesterly 35 mph with gust 50 mph on the very highest tops
Temperature
- At 800m Plus 2 falling to 0 Celsius
- Valley Plus 1 rising to 5 Celsius
- Freezing level Above summits falling to 800 metres
Low cloud and visibility
Poor in precipitation and widespread hill fog down to 500 to 800 metres, this lifting off the hills from the west as rain and snow clears from the west.
Mountain weather information
Sun 30 Nov
Sunrise:
Sunset:
Variable amounts of cloud and a few wintry showers, these dying out in the afternoon. Strengthening southwesterly winds will bring rain and higher summit snow from the west later in the evening.
Mon 1 Dec
Sunrise:
Sunset:
Extensive hill fog along with persistent rain and strong southwesterly winds, this likely to clear from the west later in the day.
Tue 2 Dec
Sunrise:
Sunset:
Windy with clear spells and showers, occasionally heavy.
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.