Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High becoming Medium in cloud details from Wednesday.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Dry and often sunny. Feeling chilly over the summits.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
00% | 00% | 00% | 00% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NE
11
|
NE
12
|
E
15
|
E
16
|
E
18
|
SE
19
|
| 600m |
E
7
|
E
8
|
E
10
|
SE
10
|
SE
11
|
SE
13
|
| 300m |
W
3
|
E
3
|
E
7
|
SE
8
|
SE
7
|
SE
9
|
| Valley |
W
3
|
E
3
|
E
7
|
E
8
|
SE
7
|
SE
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 16 | 16 | 20 | 21 | 25 | 25 |
| 600m | 10 | 11 | 15 | 16 | 19 | 21 |
| 300m | 7 | 7 | 12 | 14 | 17 | 19 |
| Valley | 7 | 7 | 12 | 14 | 17 | 19 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
2°
|
4°
|
3°
|
3°
|
| 600m |
3°
|
3°
|
5°
|
6°
|
5°
|
6°
|
| 300m |
5°
|
5°
|
8°
|
9°
|
7°
|
7°
|
| Valley |
6°
|
6°
|
9°
|
10°
|
8°
|
8°
|
| Freezing Level |
700m
|
600m
|
900m
|
1,100m
|
1,400m
|
1,600m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-3°
|
-1°
|
-2°
|
-2°
|
| 600m |
0°
|
0°
|
1°
|
3°
|
2°
|
2°
|
| 300m |
4°
|
4°
|
6°
|
7°
|
5°
|
4°
|
| Valley |
5°
|
6°
|
7°
|
8°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
A great day to be out and about.
Weather
Dry and often clear overnight, but shallow mist and freezing fog patches possible in the valleys. Any mist and fog soon clearing to leave a bright day with plenty of sunshine. Still mainly dry but becoming cloudier in the evening, lowering onto the summits at times. Feeling chilly at times over the summits.
Chance of cloud-free hill tops
90%, but 40% early and late in period.
Low cloud and visibility
Often no significant low cloud expected, but occasional cloud, base 600m, early and later in the period. Visibility mostly very good or excellent, poor or very poor in any cloud.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy or partly cloudy overnight and early morning. Any low cloud should lift and break during the day with bright and sunny spells developing. Patchy low cloud and clear spells in the evening.
Chance of cloud-free hill tops
40% overnight rising to 80% during daylight hours.
Maximum wind speed expected
South or Southeast 15 to 20mph.
Temperature
- At 800m Plus 2 Celsius rising to 8 Celsius
- Valley Plus 2 Celsius rising to 14 Celsius
- Freezing level Mainly above the summits.
Low cloud and visibility
Occasional or extensive low cloud, base 300 to 600m overnight and early morning, lifting and breaking above the summits during the day. Visibility poor or very poor in cloud, otherwise good or very good.
Mountain weather information
Thu 5 Mar
Sunrise:
Sunset:
Dry start. Cloudy or bright. Then rain and lowering cloud, turning winter over the summits. Fresh to strong south turning northwest winds at times. Freezing level above the summits, falling 600m later.
Fri 6 Mar
Sunrise:
Sunset:
Mainly dry with sunny or clear spells, early frost possible. Moderate or fresh northwest winds. Freezing level well down at first, rising above the summits during the day.
Sat 7 Mar
Sunrise:
Sunset:
Low cloud possible at first, but dry and mainly bright with sunny or clear spells. Light or moderate east or southeast winds. Freezing level mainly near or above the summits, but a frost possible early and late.
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.