Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for the general story over the next few days. Slight uncertainty in the timing of the rain arriving on Wednesday, give or take an hour or two. Easter weekend looks very unsettled but there is a lot of uncertainty in the details at this stage.
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.
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
Mostly dry, but some rain later. Windy on the tops. Mild.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | 10% | 10% | 80% | 60% | <5% |
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
18
|
W
20
|
SW
18
|
SW
19
|
NW
25
|
NW
24
|
| 600m |
SW
11
|
SW
14
|
SW
14
|
SW
17
|
NW
16
|
NW
14
|
| 300m |
SW
6
|
SW
10
|
SW
12
|
SW
13
|
NW
12
|
NW
9
|
| Valley |
SW
6
|
SW
9
|
W
12
|
SW
13
|
NW
13
|
NW
10
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 22 | 27 | 25 | 27 | 33 | 31 |
| 600m | 15 | 20 | 21 | 25 | 24 | 21 |
| 300m | 12 | 18 | 20 | 21 | 22 | 19 |
| Valley | 12 | 17 | 20 | 21 | 22 | 20 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
3°
|
4°
|
4°
|
3°
|
0°
|
| 600m |
4°
|
5°
|
6°
|
6°
|
5°
|
3°
|
| 300m |
6°
|
8°
|
9°
|
9°
|
7°
|
5°
|
| Valley |
8°
|
9°
|
11°
|
11°
|
8°
|
6°
|
| Freezing Level |
1,200m
|
1,200m
|
1,500m
|
1,800m
|
1,300m
|
900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-3°
|
-3°
|
-1°
|
-1°
|
-4°
|
-6°
|
| 600m |
1°
|
1°
|
2°
|
2°
|
0°
|
-2°
|
| 300m |
5°
|
5°
|
6°
|
7°
|
3°
|
2°
|
| Valley |
6°
|
7°
|
8°
|
9°
|
5°
|
3°
|
Additional weather information
Meteorologist's view
A mild day in the valleys but windy and rather cold on the tops, especially when the rain arrives later.
Weather
A largely cloudy day with the odd spot of light rain or drizzle but also some bright spells. Rain will turn persistent and heavier for a couple of hours late afternoon to early evening before clearing away southeast
Chance of cloud-free hill tops
30% becoming 70% during morning, then 20% later when rain arrives.
Low cloud and visibility
Extensive cloud above 500 or 600m developing overnight, lifting and clearing most summits by early afternoon before returning later in rain. Visibility away from cloud, mostly good but down to a few km at times in rain or drizzle. Cloud clearing in the evening.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Clear spells and a touch of frost overnight. A dry day with bright or sunny spells and light winds. Thicker cloud will bring some outbreaks of rain in the evening.
Chance of cloud-free hill tops
90%, becoming 30% during evening.
Maximum wind speed expected
West or Southwest 5-10mph, increasing to 25mph gusts 35mph in evening.
Temperature
- At 800m Minus 1C rising to 3C.
- Valley 0C rising to 9C.
- Freezing level 600m, rising above summits during the day.
Low cloud and visibility
Mainly excellent visibility with any cloud above the tops. Cloud becoming extensive above 700m during the evening.
Mountain weather information
Fri 3 Apr
Sunrise:
Sunset:
Unsettled with showers or longer spells of rain. Strong southwest winds with gales on the tops. Freezing level above summits.
Sat 4 Apr
Sunrise:
Sunset:
Unsettled with rain or showers, heavy at times. Strong winds with a chance of severe gales. Freezing level above summits.
Sun 5 Apr
Sunrise:
Sunset:
Brighter and colder with some showers, perhaps wintry on the tops. Strong westerly winds.
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.