Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for overall theme but moderate for rain detail. High confidence for more unsettled conditions on Sunday, but low for rain detail.
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.
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
Mainly dry today with sunny spells developing after early hill fog.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 10% | 00% | 20% | 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 |
W
21
|
SW
17
|
SW
17
|
SW
19
|
SW
24
|
S
26
|
| 600m |
W
13
|
SW
11
|
SW
14
|
SW
15
|
S
14
|
S
19
|
| 300m |
W
8
|
SW
6
|
SW
9
|
SW
9
|
S
8
|
S
12
|
| Valley |
W
8
|
SW
6
|
SW
9
|
SW
8
|
S
9
|
S
13
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 25 | 20 | 22 | 24 | 29 | 31 |
| 600m | 16 | 14 | 19 | 19 | 20 | 25 |
| 300m | 15 | 13 | 15 | 15 | 18 | 22 |
| Valley | 15 | 13 | 15 | 14 | 18 | 23 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
5°
|
5°
|
5°
|
5°
|
5°
|
5°
|
| 600m |
7°
|
7°
|
8°
|
8°
|
7°
|
7°
|
| 300m |
9°
|
9°
|
10°
|
10°
|
9°
|
9°
|
| Valley |
11°
|
10°
|
12°
|
12°
|
10°
|
11°
|
| Freezing Level |
1,700m
|
1,500m
|
1,300m
|
1,400m
|
1,500m
|
1,900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
0°
|
0°
|
0°
|
0°
|
| 600m |
4°
|
4°
|
4°
|
4°
|
4°
|
3°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
7°
|
7°
|
| Valley |
9°
|
9°
|
10°
|
10°
|
9°
|
8°
|
Additional weather information
Meteorologist's view
Poor visibility at first making navigation difficult. Recent rain will mean that conditions under foot will still be very wet and slippery in places.
Weather
Initially extensive hill fog and perhaps some patchy drizzle. Becoming dry as cloud bases lift and break this morning. Sunny for a time before high cloud arrives this afternoon, but still bright or sunny spells will occur, although there is chance of an isolated light shower across western areas. Cloud thickens through this evening.
Chance of cloud-free hill tops
10% at first but lifting and breaking this morning to become 80% by early afternoon. Through the evening decreasing 50%.
Low cloud and visibility
Extensive cloud overnight 300m to 450m, lifting and breaking this morning to 700m to 900m by midday. Through the evening areas of cloud above 800m will start to develop. Very poor visibility at first slowly improving this morning to good or very good visibility with distant hills visible. Later visibility decreases again in hill fog.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Outbreaks of edge in from the west overnight as cloud thickens and lowers, spreading across the entire park through the morning and lasting for the remainder of the day. However, some drier spells may still occur, these most likely across northern areas. Turning rather windy too.
Chance of cloud-free hill tops
50% at first but soon becoming 10% as extensive cloud spreads east with bases around 400m, obscuring most peaks.
Maximum wind speed expected
Gusts of 40-50mph.
Temperature
- At 800m 5 Celsius
- Valley 13 Celsius
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud with bases around 400m, resulting in poor or very poor visibility. Visibility below this height will generally be moderate to poor in rain and drizzle.
Mountain weather information
Mon 10 Nov
Sunrise:
Sunset:
Breezy with early rain, then dry for a time before a band of heavy rain moves east early afternoon, with dry and clearer conditions following. Temperatures near average. Freezing level above summits.
Tue 11 Nov
Sunrise:
Sunset:
Outbreaks of rain arriving through the morning followed by persistent heavy rain later. Becoming windy with severe gales developing over the summits and extensive hill fog. Freezing level above summits.
Wed 12 Nov
Sunrise:
Sunset:
Windy, but less so than on Tuesday. Probably extensive low cloud and outbreaks of rain or drizzle for much of the day. Freezing level above summits.
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.