Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Low for extent of snow and low cloud on Saturday. High for unsettled weather into week.
This evening forecast
Cloudy with outbreaks of snow, these dying out towards midnight. Strong northwesterly winds leading to severe 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.
Mountain weather forecast
Some snow at first, turning drier in the afternoon
| 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) |
50% | 50% | 50% | 30% | 20% | 20% | 00% | 00% |
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 |
NW
14
|
W
11
|
W
12
|
SW
12
|
SW
9
|
SW
10
|
S
8
|
S
15
|
| 600m |
NW
8
|
W
6
|
SE
9
|
SW
7
|
SW
7
|
SW
7
|
S
8
|
S
11
|
| 300m |
NW
3
|
S
3
|
SW
5
|
E
4
|
SW
4
|
SW
4
|
S
4
|
S
7
|
| Valley |
NW
3
|
SW
3
|
S
5
|
S
5
|
SW
5
|
SW
5
|
S
6
|
S
8
|
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 | 16 | 13 | 15 | 15 | 12 | 13 | 11 | 19 |
| 600m | 10 | 9 | 12 | 10 | 10 | 9 | 10 | 16 |
| 300m | 7 | 5 | 9 | 7 | 8 | 7 | 8 | 14 |
| Valley | 7 | 5 | 9 | 8 | 8 | 9 | 10 | 16 |
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°
|
-2°
|
-2°
|
-3°
|
-2°
|
| 600m |
-1°
|
-1°
|
-2°
|
-1°
|
0°
|
0°
|
-1°
|
-1°
|
| 300m |
0°
|
1°
|
0°
|
0°
|
2°
|
2°
|
1°
|
1°
|
| Valley |
2°
|
2°
|
1°
|
1°
|
4°
|
4°
|
2°
|
3°
|
| Freezing Level |
500m
|
500m
|
500m
|
500m
|
600m
|
600m
|
600m
|
600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-9°
|
-9°
|
-9°
|
-8°
|
-6°
|
-7°
|
-7°
|
-8°
|
| 600m |
-5°
|
-5°
|
-6°
|
-5°
|
-3°
|
-3°
|
-5°
|
-5°
|
| 300m |
-2°
|
-1°
|
-3°
|
-2°
|
0°
|
1°
|
-2°
|
-2°
|
| Valley |
0°
|
0°
|
-1°
|
-1°
|
2°
|
2°
|
0°
|
-1°
|
Additional weather information
Meteorologist's view
Nothing to add
Weather
Outbreaks of snow expected in the early hours and until mid-morning. The afternoon and evening will be dry with variable amounts of cloud. Remaining very cold with icy surfaces.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Areas of cloud down to 300 to 700 metres in the morning with poor visibility, this extensive across the west of the Park during the morning. Otherwise good visibility with patchy cloud above 800 metres.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rain, preceded by snow, will quickly extend northeast during the early hours. Then the rest of the day will be overcast with spells of rain, heavy at times. Lying snow will thaw through the day with a chance of flooded watercourses. Strong to gale southwesterly winds will make for slow progress and drenching conditions in rain.
Chance of cloud-free hill tops
Little chance
Maximum wind speed expected
Southerly average speeds 40 mph with gusts to 50 mph on the summits, but 10 mph or so stronger on the very highest tops
Temperature
- At 800m Minus 1 rising to 8 Celsius
- Valley 0 rising to 10 Celsius
- Freezing level 400 metres at first, quickly rising above summits
Low cloud and visibility
Widely poor in extensive cloud down to 300 to 700 metres throughout the day
Mountain weather information
Mon 12 Jan
Sunrise:
Sunset:
Cloudy with showers or occasionally longer spells of rain, some snow on the highest summits possible in the evening. Strong southwesterly winds with summit gales.
Tue 13 Jan
Sunrise:
Sunset:
Some showery rain or snow at first, otherwise a drier day with bright spells.
Wed 14 Jan
Sunrise:
Sunset:
Dry with variable amounts of cloud.
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.