Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for a lot of dry and bright weather on Saturday then turning much more unsettled for a few days. Lower confidence for daily rain or snow details.
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.
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.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Mainly dry and bright. The odd wintry shower early and late. Cold and breezy.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
30% | 10% | 10% | 20% | 30% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NW
16
|
W
13
|
W
14
|
W
17
|
SW
16
|
SW
22
|
| 600m |
W
8
|
W
8
|
W
11
|
W
14
|
SW
11
|
SW
12
|
| 300m |
NW
3
|
W
4
|
W
9
|
W
10
|
SW
6
|
S
8
|
| Valley |
W
3
|
W
4
|
W
9
|
W
10
|
SW
6
|
S
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 20 | 16 | 18 | 23 | 20 | 27 |
| 600m | 11 | 11 | 15 | 19 | 14 | 17 |
| 300m | 8 | 8 | 14 | 17 | 13 | 16 |
| Valley | 8 | 8 | 14 | 16 | 13 | 17 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-1°
|
-1°
|
0°
|
0°
|
-1°
|
-1°
|
| 600m |
1°
|
1°
|
2°
|
3°
|
2°
|
2°
|
| 300m |
3°
|
4°
|
5°
|
6°
|
4°
|
4°
|
| Valley |
4°
|
5°
|
7°
|
7°
|
6°
|
5°
|
| Freezing Level |
600m
|
700m
|
600m
|
600m
|
700m
|
800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-8°
|
-6°
|
-6°
|
-6°
|
-7°
|
-7°
|
| 600m |
-3°
|
-2°
|
-2°
|
-2°
|
-3°
|
-3°
|
| 300m |
2°
|
2°
|
2°
|
2°
|
2°
|
1°
|
| Valley |
3°
|
4°
|
4°
|
4°
|
4°
|
2°
|
Additional weather information
Meteorologist's view
A bright but cold day for Snowdonia with some snow and icy surfaces. Glare from lying snow may also be an issue so eye protection is advised.
Weather
Sunny spells and isolated wintry showers today, these most likely early this morning and then again late afternoon or early evening. The showers will be wintry above 600m.
Chance of cloud-free hill tops
Mostly 90%, but 60% early morning and again this evening.
Low cloud and visibility
Mainly excellent visibility during the day. Some brief reductions in showers early and late in the period with patchy cloud above 600m.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy with outbreaks of sleet or snow arriving overnight, falling as rain below 600m then turning to rain at all levels by morning. Rain clears east by early afternoon with broken cloud and scattered blustery showers following, some heavy with hail and thunder, and turning to snow above 600-700m. Strong and gusty winds.
Chance of cloud-free hill tops
Decreasing 10% by late in the night, then increasing 80%.
Maximum wind speed expected
West or SW 30 to 40mph, squally gusts up to 55mph.
Temperature
- At 800m 0C rising to 3C by morning, falling to -1C in the evening.
- Valley Plus 4C rising to 8C.
- Freezing level 800m, rising above summits by morning, falling to 800m in afternoon.
Low cloud and visibility
Mostly poor visibility with extensive cloud and fog above 600m at first. Visibility improving when rain clears but occasionally decreasing to nearby hills being visible in showers, with associated cloud down to 800m and blizzard conditions on the tops at times.
Mountain weather information
Mon 16 Mar
Sunrise:
Sunset:
Overnight showers, some heavy, wintry above 600m. These mostly die away through the morning then bright and cold with strong southwest winds possibly reaching gale force on the tops. Outbreaks of rain, preceded by summit snow, will spread east during the afternoon. Freezing level 600m, rising above summits in evening.
Tue 17 Mar
Sunrise:
Sunset:
Low cloud with patchy rain or drizzle accompanied by southwesterly gales on the tops. Perhaps a little brightness in the afternoon. Much milder with freezing level well above summits.
Wed 18 Mar
Sunrise:
Sunset:
High pressure is expected to bring more settled conditions with light winds. Some patchy low cloud around. Remaining fairly mild but overnight frost is possible.
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.