Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

A changeable week with significant temperature variation. High for general developments. Medium for cloud details.

Sunrise:
Sunset:

This evening forecast

Patchy light rain dying out with clearing skies. Fresh northerly winds at height. Lowering freezing level.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard 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

Dry and bright. Strengthening winds later.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Partly cloudy (night) Partly cloudy (night) Partly cloudy (night) Sunny intervals Sunny intervals Cloudy Cloudy Mist
Chance of precipitation
(at 800m)
<05% 00% 00% 00% 00% <05% 20% 20%

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 NE
21
NE
15
E
7
SE
9
SW
15
SW
20
SW
32
SW
39
600m NE
7
N
4
E
5
S
5
SW
14
SW
16
SW
21
SW
24
300m N
4
NW
3
S
2
SE
2
SW
9
SW
10
S
13
S
15
Valley N
4
NW
3
S
2
SE
2
SW
9
SW
10
S
12
S
15
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 30 22 9 11 20 26 40 47
600m 13 9 6 6 18 21 28 32
300m 14 9 4 4 15 16 24 28
Valley 13 8 3 4 14 16 23 27

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
Valley
10°
Freezing Level
800m
700m
700m
700m
900m
1,200m
1,300m
1,600m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-6°
-6°
-3°
-2°
-2°
-2°
-4°
-4°
600m
-1°
300m
Valley

Additional weather information

Meteorologist's view

Early frost possible in the valleys.

Weather

Dry with clear spells overnight, perhaps some mist or freezing fog in the valleys by dawn. Any mist or freezing fog clearing during the morning and staying dry and bright for much of the day, although high level cloud at times. Patchy light rain possible in the evening with some cloud developing over the summits.

Chance of cloud-free hill tops

90%, falling 40% in the evening.

Low cloud and visibility

Generally no significant low cloud, but cloud could develop around the summits during the evening. Visibility mostly very good or excellent, except in valley mist and fog, and summit cloud later.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Cloud thickening and lowering overnight with outbreaks of rain. Remaining cloudy during daylight hours with outbreaks of rain, the rain heavy and persistent at times. Strong to gale force summit winds and buffeting. Cloud lifting and breaking during the evening with showers turning wintry over the summits.

Chance of cloud-free hill tops

20% rising to 60% in the evening.

Maximum wind speed expected

Southwest 30 to 40mph gusting 60mph.

Temperature

  • At 800m Plus 4 Celsius, falling to Plus 1 Celsius later.
  • Valley Plus 6 to 13 Celsius
  • Freezing level Above the summits, falling to around 900m later.

Low cloud and visibility

Extensive low cloud much of daylight hours, base 300 to 600m, lifting and breaking towards the summits in the evening. Visibility often moderate to very poor.

Mountain weather information

Wed 25 Mar

Sunrise:
Sunset:

Cloudy or bright with wintry showers. Strong to gale force northwest winds at height with a severe wind chill. Freezing level 300 to 600m.

Thu 26 Mar

Sunrise:
Sunset:

Cloudy or bright with wintry showers. Fresh to strong northwest winds at height with a significant winds chill. Freezing most levels, rising to around the summits during the day.

Fri 27 Mar

Sunrise:
Sunset:

Overnight rain, with snow at first at height. Rain during the morning with drier and brighter spells developing through the afternoon. Southwest becoming northwest winds, fresh to strong at times. Freezing level near or above the summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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