Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue into the weekend
This evening forecast
Mainly dry and cloudy. Strong, cold summit easterly winds.
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.
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.
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 and windy with outbreaks of sleet and snow
| 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% | 40% | 50% | 60% | 60% | 60% | 60% |
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 |
E
37
|
E
41
|
E
44
|
E
45
|
E
41
|
E
39
|
E
37
|
E
36
|
| 600m |
E
24
|
E
27
|
E
30
|
E
31
|
E
28
|
E
26
|
E
24
|
E
23
|
| 300m |
E
17
|
E
17
|
E
21
|
E
23
|
E
21
|
E
21
|
E
19
|
E
18
|
| Valley |
E
16
|
E
16
|
E
20
|
E
21
|
E
20
|
E
20
|
E
18
|
E
17
|
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 | 49 | 54 | 59 | 61 | 56 | 53 | 51 | 50 |
| 600m | 36 | 40 | 45 | 46 | 43 | 41 | 40 | 38 |
| 300m | 33 | 34 | 40 | 43 | 39 | 38 | 35 | 34 |
| Valley | 30 | 32 | 38 | 41 | 37 | 37 | 33 | 32 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
-1°
|
-2°
|
-2°
|
-2°
|
-2°
|
-1°
|
| 600m |
2°
|
2°
|
1°
|
1°
|
1°
|
1°
|
1°
|
1°
|
| 300m |
4°
|
5°
|
4°
|
3°
|
3°
|
3°
|
3°
|
3°
|
| Valley |
6°
|
6°
|
5°
|
4°
|
5°
|
5°
|
4°
|
4°
|
| Freezing Level |
1,000m
|
1,000m
|
800m
|
700m
|
700m
|
700m
|
800m
|
900m
|
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°
|
-11°
|
-12°
|
-11°
|
-11°
|
-11°
|
-10°
|
| 600m |
-5°
|
-4°
|
-6°
|
-7°
|
-7°
|
-7°
|
-6°
|
-6°
|
| 300m |
-1°
|
0°
|
-2°
|
-3°
|
-3°
|
-3°
|
-3°
|
-3°
|
| Valley |
1°
|
2°
|
0°
|
-1°
|
-1°
|
0°
|
-1°
|
-1°
|
Additional weather information
Meteorologist's view
Be prepared for winter conditions at altitude with summit gales, severe wind chill and snow at times.
Weather
A cloudy day with some outbreaks of sleet and snow, these most frequent across the east of the Park.
Chance of cloud-free hill tops
30%
Low cloud and visibility
Poor in extensive cloud down to 600 to 800 metres, highest bases with cloud more broken cross the west of the Park.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Overcast with rain or occasionally some higher summit snow. Some drier spells of weather at times across the west of the Park. Strong to gale summit easterly winds leading to severe wind chill, slow progress and some blowing snow at times.
Chance of cloud-free hill tops
40%, best chance across the west of the Park
Maximum wind speed expected
Easterly average speeds of 35 mph with gusts to 50 mph on the higher tops.
Temperature
- At 800m Plus 2 Celsius
- Valley Plus 3 rising to 7 Celsius
- Freezing level 1000 metres or higher
Low cloud and visibility
Poor in extensive low cloud down to 700 to 900 metres, although cloud more broken across the west with some shelter from the easterly wind. Poor in any blowing snow.
Mountain weather information
Sat 7 Feb
Sunrise:
Sunset:
Chance of an early shower otherwise dry for most of the day. Rain will spread north through the evening.
Sun 8 Feb
Sunrise:
Sunset:
Cloudy with outbreaks of rain.
Mon 9 Feb
Sunrise:
Sunset:
Drier with variable amounts of cloud and a chance of a few showers.
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.