Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for unsettled conditions at times during the week. Lower confidence for cloud and rain details and timings.
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
Early showers soon easing, then rain spreading in late morning. Strong winds, perhaps gales on highest summits.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 10% | 80% | 80% | 80% | 70% |
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
43
|
W
40
|
SW
35
|
SW
29
|
SW
33
|
SW
29
|
| 600m |
SW
27
|
SW
27
|
SW
25
|
SW
20
|
SW
19
|
SW
18
|
| 300m |
SW
16
|
SW
17
|
SW
16
|
SW
12
|
SW
12
|
SW
11
|
| Valley |
SW
16
|
SW
17
|
SW
16
|
SW
12
|
SW
11
|
SW
11
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 50 | 49 | 43 | 36 | 40 | 36 |
| 600m | 33 | 35 | 32 | 26 | 25 | 24 |
| 300m | 29 | 31 | 29 | 21 | 22 | 21 |
| Valley | 29 | 31 | 28 | 21 | 22 | 22 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
4°
|
5°
|
6°
|
6°
|
| 600m |
4°
|
4°
|
6°
|
7°
|
8°
|
7°
|
| 300m |
7°
|
7°
|
8°
|
8°
|
9°
|
9°
|
| Valley |
8°
|
8°
|
10°
|
10°
|
10°
|
10°
|
| Freezing Level |
1,200m
|
1,100m
|
1,500m
|
2,100m
|
2,300m
|
2,400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-6°
|
-6°
|
-3°
|
-1°
|
0°
|
0°
|
| 600m |
-2°
|
-2°
|
0°
|
2°
|
4°
|
3°
|
| 300m |
3°
|
3°
|
5°
|
5°
|
6°
|
6°
|
| Valley |
5°
|
5°
|
7°
|
7°
|
8°
|
8°
|
Additional weather information
Meteorologist's view
Note the deterioration in navigation conditions during the morning. Freezing level rising well above all summits. Risk of gale force gusts on the highest summits. Mild, but still feeling cold in the wind.
Weather
Any early showers soon dying out, leaving a few brighter spells first thing. Cloud will increase from the west after mid-morning, with some light rain and drizzle arriving after late morning. Rain continuing for much of the afternoon and evening with some heavier spells possible for western upslopes. Winds easing a little for the afternoon.
Chance of cloud-free hill tops
70% decreasing to 20% from late morning.
Low cloud and visibility
Areas of cloud in the west with layers above 500m, more patchy in the east and some cloud breaks likely here at first. Low cloud layers increasing late morning with more widespread cloud developing above 400m and lowering further during the afternoon, bases reducing to 200-300m in the southwest at times. Visibility will be occasionally good at first but turning moderate to very poor in rain and low cloud.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Quite cloudy for much of the day with periods of drizzle or light rain at times, especially around northern mountains, perhaps some brightness around southern hills. Cloud lifting in the afternoon with the chance of some brighter conditions especially around more southern hills.
Chance of cloud-free hill tops
20% improving to 80% in the south, but remaining a bit lower in the north.
Maximum wind speed expected
Southerly or southwesterly 30-40 mph with gusts 45-55mph.
Temperature
- At 800m Plus 5C
- Valley Plus 5C becoming plus 10C in the afternoon
- Freezing level Above all summits
Low cloud and visibility
Widespread cloud with bases above 300m at first turning to areas of cloud above 400-500m by dawn, then lifting above 600-700m for the afternoon, although a risk of lower cloud lingering in western parts. Visibility moderate to very poor at times in drizzle and low cloud at first, improving good or very good away from cloud.
Mountain weather information
Wed 25 Feb
Sunrise:
Sunset:
Cloudy with outbreaks of rain in the morning, rain turning lighter and patchier in the afternoon, strong southerly or southwesterly winds. Mild.
Thu 26 Feb
Sunrise:
Sunset:
Strong to gale force southwesterly winds, remaining cloudy with outbreaks of rain.
Fri 27 Feb
Sunrise:
Sunset:
Some uncertainty towards the end of the week with potential for strong winds and some rain or snow, turning colder again with freezing level lowering to around 400m. Keep an eye on the latest forecast to keep up to date with the conditions for later in the week.
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.