Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for unsettled conditions with rain spreading in from the south and west at times. Confidence in the day-to-day detail decreasing through the period so please keep updated on the forecast.
This evening forecast
Mainly dry with clear spells but some areas of mist and fog developing. Fresh southerly winds on the tops. Freezing level above summits.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Outbreaks of rain and summit sleet or snow. Cold and breezy on the tops.
| 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) |
<05% | <05% | <05% | 10% | 70% | 90% | 90% | 90% |
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
17
|
SE
16
|
SE
18
|
SE
18
|
SE
16
|
S
12
|
SE
12
|
SE
12
|
| 600m |
SE
12
|
SE
12
|
SE
12
|
SE
11
|
SE
11
|
S
9
|
SE
8
|
SE
8
|
| 300m |
SE
9
|
SE
9
|
SE
9
|
SE
7
|
SE
6
|
SE
5
|
SE
4
|
SE
4
|
| Valley |
SE
10
|
SE
10
|
SE
10
|
SE
8
|
SE
7
|
SE
5
|
SE
5
|
SE
4
|
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 | 21 | 20 | 22 | 22 | 19 | 15 | 14 | 15 |
| 600m | 16 | 16 | 17 | 16 | 15 | 12 | 11 | 11 |
| 300m | 15 | 15 | 15 | 14 | 11 | 9 | 8 | 7 |
| Valley | 17 | 17 | 16 | 15 | 12 | 8 | 8 | 7 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
0°
|
0°
|
1°
|
1°
|
1°
|
1°
|
| 600m |
3°
|
3°
|
2°
|
2°
|
3°
|
3°
|
2°
|
2°
|
| 300m |
4°
|
4°
|
4°
|
4°
|
6°
|
6°
|
4°
|
4°
|
| Valley |
5°
|
5°
|
4°
|
5°
|
7°
|
7°
|
5°
|
5°
|
| Freezing Level |
1,000m
|
1,000m
|
1,000m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-5°
|
-5°
|
-6°
|
-6°
|
-4°
|
-4°
|
-4°
|
-4°
|
| 600m |
-1°
|
-1°
|
-2°
|
-2°
|
-1°
|
0°
|
-1°
|
-1°
|
| 300m |
1°
|
1°
|
1°
|
1°
|
3°
|
4°
|
3°
|
3°
|
| Valley |
2°
|
2°
|
1°
|
2°
|
4°
|
5°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
A cold day on the tops with a significant wind chill, especially in rain and sleet. Difficult navigation conditions as low cloud becomes extensive.
Weather
Mainly dry overnight with areas of low cloud. Sunday starts off mostly dry with some low cloud, best of any brightness over lower northern hills. Outbreaks of rain will soon spread northwards, becoming heavy at times with some sleet or snow above 800m.
Chance of cloud-free hill tops
10%.
Low cloud and visibility
Extensive cloud with bases 300-500m, but higher at times over far northern hills. Away from low cloud, visibility rather hazy and often dropping to a few kilometres in rain or sleet.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Low cloud with outbreaks of rain through the day and overnight. Some sleet above 900m with a significant wind chill on the tops.
Chance of cloud-free hill tops
Less than 10%.
Maximum wind speed expected
Southeast 20mph gusts 30mph.
Temperature
- At 800m Plus 2C.
- Valley Plus 6 or 7C.
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud and fog above 300 or 400m, lifting to 600m at times over northern hills. Some good visibility at times below the cloud base.
Mountain weather information
Tue 20 Jan
Sunrise:
Sunset:
Low cloud with outbreaks of rain at first then becoming drier and brighter for a period. Further heavy rain and summit snow is likely to arrive in the evening. Strong southerly winds with a severe wind chill on the tops. Freezing level above summits.
Wed 21 Jan
Sunrise:
Sunset:
Outbreaks of rain, heavy at times with sleet or snow on high summits. Severe gale force southerly winds with severe wind chill on the tops. Freezing level 900m then rising above summits.
Thu 22 Jan
Sunrise:
Sunset:
It is expected to remain unsettled and very windy with further periods of rain. Severe gale force southerly winds. Freezing level above 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.