Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue into the weekend. Low for daily detail of any rainfall.
This evening forecast
Cloudy with occasional rain, this most extensive across the south of the Park. Strong to gale southeasterly summit winds with significant wind chill.
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.
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.
Mountain weather forecast
Cloudy with outbreaks of rain and higher summit snow
| 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) |
10% | 10% | 20% | 40% | 40% | 70% | 40% | 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 |
SE
31
|
SE
30
|
SE
28
|
SE
25
|
SE
23
|
SE
21
|
SE
18
|
S
18
|
| 600m |
SE
22
|
SE
21
|
SE
19
|
SE
17
|
SE
18
|
SE
16
|
SE
14
|
S
13
|
| 300m |
SE
16
|
SE
15
|
SE
13
|
SE
12
|
SE
12
|
SE
11
|
SE
9
|
S
9
|
| Valley |
SE
17
|
SE
16
|
SE
14
|
SE
13
|
SE
13
|
SE
13
|
SE
11
|
SE
10
|
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 | 42 | 40 | 37 | 34 | 32 | 30 | 26 | 24 |
| 600m | 33 | 31 | 28 | 27 | 27 | 25 | 22 | 20 |
| 300m | 29 | 28 | 25 | 24 | 23 | 22 | 18 | 16 |
| Valley | 30 | 29 | 25 | 23 | 24 | 24 | 21 | 18 |
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°
|
3°
|
3°
|
2°
|
1°
|
0°
|
| 600m |
5°
|
5°
|
5°
|
5°
|
5°
|
4°
|
3°
|
2°
|
| 300m |
8°
|
7°
|
7°
|
7°
|
7°
|
7°
|
5°
|
5°
|
| Valley |
9°
|
8°
|
8°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| Freezing Level |
1,400m
|
1,400m
|
1,300m
|
1,400m
|
1,300m
|
1,300m
|
1,100m
|
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°
|
-4°
|
-4°
|
-4°
|
-3°
|
-4°
|
-5°
|
-5°
|
| 600m |
0°
|
0°
|
0°
|
0°
|
0°
|
0°
|
-1°
|
-2°
|
| 300m |
4°
|
4°
|
3°
|
4°
|
4°
|
4°
|
2°
|
2°
|
| Valley |
5°
|
5°
|
5°
|
5°
|
5°
|
5°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
Be prepared for significant wind chill on the highest tops. Strong summit winds will make for slow progress and drenching conditions in rain.
Weather
A cloudy day with outbreaks of rain, this becoming more persistent and occasionally heavy through the afternoon and evening. Some sleet or wet snow developing on the very highest tops in the afternoon and evening too.
Chance of cloud-free hill tops
40%, best chance across the northwest of the Park
Low cloud and visibility
Poor in areas of cloud down to 700 to 900 metres, lowest cloud bases across the south of the Park where hill fog will be most extensive.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
After a dry start outbreaks of rain, with sleet or wet snow on the highest tops, will spread north in the afternoon and evening. Some uncertainty in the extent and timing of this precipitation. Strong to gale winds with significant wind chill.
Chance of cloud-free hill tops
30%
Maximum wind speed expected
East or southeasterly winds with average speeds of 30 mph with gusts to 50 mph on the higher tops
Temperature
- At 800m Plus 2 Celsius
- Valley Plus 2 rising to 6 Celsius
- Freezing level Above the summits
Low cloud and visibility
Poor in widespread hill fog down to 500 to 800 metres, lowest bases across the south of the Park
Mountain weather information
Sat 24 Jan
Sunrise:
Sunset:
Very windy with a chance of some rain at times. Strong to gale southeasterly summits.
Sun 25 Jan
Sunrise:
Sunset:
Dry and partly cloudy.
Mon 26 Jan
Sunrise:
Sunset:
Dry with variable amounts of cloud.
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.