Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Medium.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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
Cloudy with rain and drizzle. Drier spells developing. Windy, summit gales.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
50% | 40% | 30% | 20% | 20% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SW
44
|
SW
45
|
S
44
|
S
44
|
S
47
|
S
44
|
| 600m |
S
29
|
S
31
|
S
31
|
S
28
|
S
32
|
S
29
|
| 300m |
S
18
|
S
21
|
S
24
|
S
20
|
S
20
|
S
18
|
| Valley |
S
17
|
S
20
|
S
23
|
S
19
|
S
20
|
S
18
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 51 | 54 | 54 | 54 | 58 | 55 |
| 600m | 35 | 39 | 41 | 37 | 42 | 38 |
| 300m | 31 | 36 | 38 | 32 | 36 | 33 |
| Valley | 30 | 34 | 36 | 30 | 35 | 32 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
3°
|
3°
|
3°
|
4°
|
5°
|
4°
|
| 600m |
5°
|
5°
|
5°
|
6°
|
7°
|
6°
|
| 300m |
8°
|
7°
|
8°
|
9°
|
10°
|
9°
|
| Valley |
9°
|
9°
|
9°
|
10°
|
11°
|
10°
|
| Freezing Level |
1,700m
|
1,700m
|
1,500m
|
1,600m
|
1,700m
|
1,600m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-5°
|
-5°
|
-5°
|
-3°
|
-3°
|
-3°
|
| 600m |
-1°
|
-1°
|
-1°
|
1°
|
1°
|
1°
|
| 300m |
3°
|
3°
|
3°
|
5°
|
6°
|
5°
|
| Valley |
5°
|
5°
|
5°
|
7°
|
7°
|
7°
|
Additional weather information
Meteorologist's view
Nothing further to add.
Weather
Cloudy with patchy light rain and drizzle, the rain and drizzle mostly likely on southwest facing slopes. However, the cloud gradually lifting during the day with drier spells and perhaps a little brightness at times, the best of the brightness expected around Cadair Idris and the south.
Chance of cloud-free hill tops
20% rising to 60% in the afternoon, best chance across the south of the park.
Low cloud and visibility
Extensive low cloud, base 300 to 500m, lifting 600 to 800m during the day, perhaps breaking in a few places. Visibility moderate to very poor in rain, drizzle and cloud, but good at times lower down.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy with showers or longer outbreaks of rain, the rain heavy at times.
Chance of cloud-free hill tops
30%
Maximum wind speed expected
South or Southwest 20 to 30mph, gusting 40mph.
Temperature
- At 800m Plus 5 Celsius
- Valley Plus 6 to 12 Celsius
- Freezing level Above the summits
Low cloud and visibility
Extensive low cloud, base 400 to 700m. Visibility moderate to very poor in cloud and rain, but good at times low down.
Mountain weather information
Thu 26 Feb
Sunrise:
Sunset:
Cloudy with showers or longer outbreaks of rain. Strong to gale force southwest winds at height. Freezing level above the summits.
Fri 27 Feb
Sunrise:
Sunset:
Heavy rain soon clearing to showers. The showers turning wintry with the snow level down to around 600m be the end of the day. Strong to gale force west or southwest winds at height with a severe wind chill.
Sat 28 Feb
Sunrise:
Sunset:
Wintry showers soon dying out. Then rain and summit snow developing during the afternoon and evening with strong to gale force southerly winds developing. Freezing level around the 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.