Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue for the next few days. Low for precipitation detail on a daily basis.
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
Dry at first, with rain and higher summit snow moving in during the morning.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 70% | 60% | 60% | 20% | 40% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
E
36
|
E
45
|
E
38
|
SE
34
|
E
39
|
E
44
|
| 600m |
SE
20
|
E
30
|
SE
26
|
SE
23
|
E
25
|
E
30
|
| 300m |
SE
12
|
SE
19
|
SE
18
|
SE
16
|
E
17
|
E
21
|
| Valley |
SE
12
|
SE
19
|
SE
18
|
SE
15
|
SE
16
|
SE
21
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 42 | 52 | 46 | 42 | 47 | 54 |
| 600m | 25 | 36 | 32 | 30 | 33 | 39 |
| 300m | 24 | 34 | 30 | 28 | 31 | 37 |
| Valley | 24 | 34 | 30 | 28 | 31 | 37 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
1°
|
1°
|
0°
|
0°
|
| 600m |
2°
|
2°
|
3°
|
3°
|
3°
|
3°
|
| 300m |
4°
|
5°
|
6°
|
6°
|
6°
|
5°
|
| Valley |
6°
|
6°
|
7°
|
7°
|
7°
|
7°
|
| Freezing Level |
900m
|
1,000m
|
1,000m
|
1,000m
|
900m
|
900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-9°
|
-9°
|
-8°
|
-8°
|
-8°
|
-9°
|
| 600m |
-4°
|
-5°
|
-4°
|
-3°
|
-3°
|
-4°
|
| 300m |
0°
|
0°
|
1°
|
2°
|
1°
|
0°
|
| Valley |
2°
|
2°
|
3°
|
4°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Strong winds at height will make for slow progress, significant wind chill and drenching conditions in rain. Sleet or snow is also possible on the highest ground, which will make conditions difficult.
Weather
After a dry start, rain and higher summit sleet and wet snow will spread north by mid-morning for a few hours. Drier weather with a few wintry showers will follow on in the afternoon. Then dry into the evening.
Chance of cloud-free hill tops
50%, best chance in the afternoon across the west of the Park
Low cloud and visibility
Poor visibility in low cloud, sleet or snow is possible, otherwise moderate to good. The lowest bases across the east of the Park. Cloud generally with bases 800-900m, but could go down to 400-500m in any sleet or snow.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy and windy with outbreaks of rain, and some higher summit snow possible.
Chance of cloud-free hill tops
50%, best chance across the west of the Park
Maximum wind speed expected
Southeasterly average speeds of 35 mph with gusts to 55 mph
Temperature
- At 800m Plus 3 Celsius
- Valley Plus 3 rising to 6 Celsius
- Freezing level Above summits
Low cloud and visibility
Poor visibility in rain or snow, but moderate to good elsewhere. Cloud bases generally above 900m, but may go down to 500-700m in any precipitation. Lowest bases across the east of the Park
Mountain weather information
Sun 25 Jan
Sunrise:
Sunset:
Cloudy with outbreaks of rain, some sleet or wet snow on the highest tops. Light winds. Freezing level 700m.
Mon 26 Jan
Sunrise:
Sunset:
Cloudy and windy with rain and higher summit snow spreading north during the day. Freezing level going down to 200-300m.
Tue 27 Jan
Sunrise:
Sunset:
Little change, remaining unsettled with further spells of rain and snow. Freezing level down to 100-200m.
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.