Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for changeable weather to continue into early next week. Low for precipitation detail on a daily basis.

Sunrise:
Sunset:

This evening forecast

Cloudy with rain and summit snow. Strong to gale easterly summit winds will make for severe wind chill.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

hazard 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.

hazard 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.
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

Cloudy with outbreaks of rain, strong summit winds and snow at first

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Heavy snow Heavy snow Sleet Heavy rain Heavy rain Heavy rain Light rain Light rain
Chance of precipitation
(at 800m)
70% 80% 60% 60% 50% 70% 70% 70%

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 E
36
E
33
E
32
E
31
E
28
E
23
E
20
E
15
600m E
23
E
21
E
20
E
19
E
17
E
15
E
13
E
10
300m E
17
E
16
E
15
E
15
E
13
E
12
E
10
E
7
Valley E
16
E
16
E
15
E
15
E
13
E
11
SE
10
SE
7
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 49 45 44 41 38 32 27 21
600m 36 34 33 31 28 24 20 16
300m 33 30 29 27 24 22 17 13
Valley 30 29 28 26 23 21 18 13

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-2°
-1°
-1°
600m
300m
Valley
Freezing Level
1,000m
1,100m
1,300m
1,300m
1,400m
1,400m
1,400m
1,400m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-10°
-10°
-9°
-8°
-6°
-5°
-5°
-4°
600m
-6°
-6°
-5°
-4°
-2°
-1°
-1°
-1°
300m
-3°
-2°
-2°
-1°
Valley
-1°

Additional weather information

Meteorologist's view

A rise in the freezing level through the day will lead to some thaw of fresh snow. Strong to gale summit winds at first will make slow progress, drenching conditions and significant wind chill.

Weather

Cloudy throughout with spells of rain, some summit sleet and snow at first. The west of the Park will see some spells of drier weather in the afternoon and evening.

Chance of cloud-free hill tops

40%, best chance across the west

Low cloud and visibility

Poor in extensive cloud down to 500 to 800 metres, some patches around 350 metres over eastern facing slopes across the east of the Park. Cloud more broken with higher bases across the west of the area.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Another cloudy day with rain at times, but some drier spells of weather too.

Chance of cloud-free hill tops

50%

Maximum wind speed expected

Easterly average speeds of 30 mph with gusts to 50 mph across the higher tops at times

Temperature

  • At 800m Plus 4 Celsius
  • Valley Plus 4 rising to 10 Celsius
  • Freezing level Above the summits

Low cloud and visibility

Poor in areas of cloud down to 650 to 900 metres, lowest bases across the east of the area. Cloud somewhat more broken across the west of the area.

Mountain weather information

Sun 8 Feb

Sunrise:
Sunset:

A cloudy start with occasional rain at first, then dry with cloud lifting and breaking by the afternoon. Light winds.

Mon 9 Feb

Sunrise:
Sunset:

Dry for most of the day before rain and strengthening southeasterly winds spread northeast in the evening.

Tue 10 Feb

Sunrise:
Sunset:

Remaining unsettled with further spells of rain.

Updated at:

Summit specific forecast

Mountain summit forecast map

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