Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High of turning milder but remaining occasionally unsettled. Lowering for the confidence in timing detail of worst of conditions.
This evening forecast
Mainly dry with best of the clear spells in the east. Fresh to strong northerly summit winds, bringing severe wind chill effect in the very low freezing level.
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 bright but cold. Winds strengthening later in day.
| 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) |
00% | 00% | <05% | <05% | <05% | <05% | <05% | 20% |
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 |
NE
20
|
N
16
|
N
14
|
E
9
|
S
7
|
S
16
|
SW
23
|
SW
32
|
| 600m |
SE
9
|
N
9
|
N
7
|
SE
6
|
S
8
|
S
13
|
S
15
|
S
21
|
| 300m |
SE
4
|
NW
6
|
N
3
|
SE
3
|
S
6
|
S
8
|
S
9
|
S
11
|
| Valley |
SE
5
|
NW
6
|
N
3
|
S
4
|
S
6
|
S
9
|
S
9
|
S
11
|
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 | 24 | 18 | 16 | 11 | 9 | 20 | 28 | 38 |
| 600m | 12 | 12 | 8 | 7 | 11 | 16 | 20 | 28 |
| 300m | 10 | 10 | 6 | 5 | 8 | 15 | 18 | 23 |
| Valley | 10 | 10 | 6 | 5 | 9 | 15 | 18 | 23 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-2°
|
-2°
|
-2°
|
-2°
|
-1°
|
-1°
|
-1°
|
0°
|
| 600m |
0°
|
0°
|
0°
|
0°
|
1°
|
1°
|
1°
|
2°
|
| 300m |
2°
|
1°
|
1°
|
2°
|
4°
|
3°
|
3°
|
4°
|
| Valley |
3°
|
2°
|
2°
|
3°
|
5°
|
5°
|
4°
|
5°
|
| Freezing Level |
400m
|
400m
|
400m
|
400m
|
500m
|
600m
|
700m
|
800m
|
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°
|
-8°
|
-6°
|
-5°
|
-8°
|
-8°
|
-9°
|
| 600m |
-4°
|
-5°
|
-4°
|
-3°
|
-2°
|
-4°
|
-4°
|
-4°
|
| 300m |
0°
|
-2°
|
0°
|
0°
|
1°
|
0°
|
0°
|
0°
|
| Valley |
2°
|
0°
|
1°
|
1°
|
3°
|
2°
|
1°
|
1°
|
Additional weather information
Meteorologist's view
Nothing to add
Weather
Largely dry by day with only a few light isolated showers appearing. Feeling cold despite the good spells of weak late autumn sunshine. Cloud increasing for the evening, bringing some patchy light sleet and snow late evening.
Chance of cloud-free hill tops
80-90% by day
Low cloud and visibility
Visibility very good becoming moderate or poor in sleet, very poor in snow and within cloud with bases infrequently developing to this level.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rain preceded by summit snow, reaching from the west overnight, which clears to showers and brighter spells from mid-morning. Cloud increasing for the afternoon to bring periods of rain for the evening. Summit gale at first.
Chance of cloud-free hill tops
10% becoming 60-70% by noon, 25% late afternoon, then 10% late evening
Maximum wind speed expected
South to southwest initially mean 35mph with gusts reaching 45-50mph across most exposed ridges and summits. Winds easing slowly from mid-morning.
Temperature
- At 800m Plus 1 Celsius rising 3-4 Celsius for the afternoon
- Valley Plus 1 Celsius rising 10 Celsius for the afternoon
- Freezing level 900m rising above summits
Low cloud and visibility
Visibility good or very good becoming moderate or poor in rain or sleet, very poor in snow and within cloud with bases initially extensive from 600m, lifting and breaking late morning, before thickening and lowering again later in the day.
Mountain weather information
Sun 23 Nov
Sunrise:
Sunset:
Showers or longer periods of rain, occasionally heavy and across higher peaks wintry. Winds fresh to strong, bringing severe wind chill effect at height. Freezing level around 800-900m.
Mon 24 Nov
Sunrise:
Sunset:
Rather cloudy with showers, these wintry across higher routes and dwindling later in the day. Winds strong, bringing severe wind chill effect at height.
Tue 25 Nov
Sunrise:
Sunset:
Mainly dry with some brighter spells. Freezing level around highest peaks. Relatively light winds.
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.