Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue into early next week. Low for precipitation detail on a daily basis.
This evening forecast
Cloudy with rain and summit snow. Strong to gale easterly summit winds will make for severe wind chill.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Mountain weather forecast
Cloudy with outbreaks of rain, strong summit winds and snow at first
| 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) |
70% | 80% | 60% | 60% | 50% | 70% | 70% | 70% |
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
36
|
E
33
|
E
32
|
E
31
|
E
28
|
E
23
|
E
20
|
E
15
|
| 600m |
E
23
|
E
21
|
E
20
|
E
19
|
E
17
|
E
15
|
E
13
|
E
10
|
| 300m |
E
17
|
E
16
|
E
15
|
E
15
|
E
13
|
E
12
|
E
10
|
E
7
|
| Valley |
E
16
|
E
16
|
E
15
|
E
15
|
E
13
|
E
11
|
SE
10
|
SE
7
|
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 | 45 | 44 | 41 | 38 | 32 | 27 | 21 |
| 600m | 36 | 34 | 33 | 31 | 28 | 24 | 20 | 16 |
| 300m | 33 | 30 | 29 | 27 | 24 | 22 | 17 | 13 |
| Valley | 30 | 29 | 28 | 26 | 23 | 21 | 18 | 13 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-2°
|
-1°
|
-1°
|
0°
|
1°
|
2°
|
1°
|
1°
|
| 600m |
0°
|
1°
|
1°
|
2°
|
3°
|
4°
|
3°
|
3°
|
| 300m |
3°
|
3°
|
3°
|
4°
|
5°
|
6°
|
5°
|
5°
|
| Valley |
4°
|
4°
|
4°
|
5°
|
6°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,000m
|
1,100m
|
1,300m
|
1,300m
|
1,400m
|
1,400m
|
1,400m
|
1,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-10°
|
-10°
|
-9°
|
-8°
|
-6°
|
-5°
|
-5°
|
-4°
|
| 600m |
-6°
|
-6°
|
-5°
|
-4°
|
-2°
|
-1°
|
-1°
|
-1°
|
| 300m |
-3°
|
-2°
|
-2°
|
-1°
|
1°
|
3°
|
2°
|
2°
|
| Valley |
-1°
|
0°
|
0°
|
1°
|
3°
|
4°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
A rise in the freezing level through the day will lead to some thaw of fresh snow. Strong to gale summit winds at first will make slow progress, drenching conditions and significant wind chill.
Weather
Cloudy throughout with spells of rain, some summit sleet and snow at first. The west of the Park will see some spells of drier weather in the afternoon and evening.
Chance of cloud-free hill tops
40%, best chance across the west
Low cloud and visibility
Poor in extensive cloud down to 500 to 800 metres, some patches around 350 metres over eastern facing slopes across the east of the Park. Cloud more broken with higher bases across the west of the area.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another cloudy day with rain at times, but some drier spells of weather too.
Chance of cloud-free hill tops
50%
Maximum wind speed expected
Easterly average speeds of 30 mph with gusts to 50 mph across the higher tops at times
Temperature
- At 800m Plus 4 Celsius
- Valley Plus 4 rising to 10 Celsius
- Freezing level Above the summits
Low cloud and visibility
Poor in areas of cloud down to 650 to 900 metres, lowest bases across the east of the area. Cloud somewhat more broken across the west of the area.
Mountain weather information
Sun 8 Feb
Sunrise:
Sunset:
A cloudy start with occasional rain at first, then dry with cloud lifting and breaking by the afternoon. Light winds.
Mon 9 Feb
Sunrise:
Sunset:
Dry for most of the day before rain and strengthening southeasterly winds spread northeast in the evening.
Tue 10 Feb
Sunrise:
Sunset:
Remaining unsettled with further spells of rain.
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.