Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High overall.
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.
Mountain weather forecast
Early rain clearing leaving a dry and bright day with strong easterly or southeasterly winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
40% | 20% | 10% | <05% | 10% | 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 |
E
37
|
E
33
|
SE
25
|
SE
22
|
E
20
|
E
22
|
| 600m |
E
24
|
SE
21
|
SE
17
|
SE
15
|
E
13
|
E
13
|
| 300m |
SE
16
|
E
14
|
SE
12
|
SE
9
|
E
9
|
E
9
|
| Valley |
SE
16
|
SE
14
|
SE
12
|
SE
9
|
SE
9
|
E
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 43 | 38 | 30 | 27 | 24 | 26 |
| 600m | 29 | 27 | 22 | 21 | 19 | 20 |
| 300m | 28 | 25 | 20 | 18 | 17 | 16 |
| Valley | 28 | 25 | 20 | 18 | 17 | 16 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
5°
|
4°
|
4°
|
4°
|
4°
|
4°
|
| 600m |
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
| 300m |
8°
|
8°
|
9°
|
8°
|
7°
|
7°
|
| Valley |
10°
|
9°
|
10°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,900m
|
1,700m
|
1,400m
|
1,300m
|
1,400m
|
1,600m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
| 600m |
1°
|
1°
|
2°
|
3°
|
2°
|
2°
|
| 300m |
5°
|
4°
|
6°
|
6°
|
5°
|
5°
|
| Valley |
6°
|
6°
|
8°
|
7°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
Strong easterly winds will slowly ease during the day, freezing level above all summits. The best conditions are likely in the northwest around Snowdon/Yr Wyddfa.
Weather
Rain will clear around dawn, cloud will slowly lift and clear. During the day it will be bright and mainly dry, perhaps cloudier around eastern hills.
Chance of cloud-free hill tops
40% rising to 90%, 60% during the evening.
Low cloud and visibility
Layers of broken low cloud above 400-500m in the early morning will slowly lift and clear during the morning with most cloud above summit level in the afternoon. Perhaps some patches in the east above 700m in the afternoon. Low cloud returning during the evening. Visibility will be good and become very good as the day goes on.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy day with a lot of mist and fog and low cloud around, the best conditions will be towards the north western mountains. It will be mostly dry throughout, perhaps some drizzle in the east as cloud thickens.
Chance of cloud-free hill tops
50%, best chance in the northwest.
Maximum wind speed expected
Easterly 20 gust 30-35 mph.
Temperature
- At 800m Plus 3 falling to zero Celsius.
- Valley Plus 8 rising to 10 Celsius.
- Freezing level Above all summits but lowering in the evening to 700m
Low cloud and visibility
Layers of broken cloud above 500m in the east, cloud more scattered in the east. Visibility will be moderate at times during the day but mainly good in the west.
Mountain weather information
Wed 24 Dec
Sunrise:
Sunset:
A bright and sunny day with strong easterly winds, cloudy at times, feeling very cold on the hills.
Thu 25 Dec
Sunrise:
Sunset:
A cold day with fresh or strong easterly winds but a lot of bright and dry weather for Christmas walks.
Fri 26 Dec
Sunrise:
Sunset:
The cold east or northeasterly conditions continuing with some bright spells and light winds.
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.