Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for cold conditions on Wednesday and Thursday but some uncertainty in cloud amounts. Low confidence for Thursday evening, Friday and the weekend for the progress of fronts arriving from the southwest.

Sunrise:
Sunset:

This evening forecast

Dry and cloudy. Extensive cloud and fog above 400m giving difficult conditions for navigation. Strong easterly winds at height and feeling bitterly cold with a 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 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.

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.

Mountain weather forecast

Mainly dry but feeling bitterly cold with strong easterly winds on the tops.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Fog Fog Fog Fog Cloudy Sunny intervals Cloudy Partly cloudy (night)
Chance of precipitation
(at 800m)
10% 10% 10% 10% 10% 10% 10% 10%

Wind direction and speed (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m E
28
E
28
E
26
E
25
E
23
E
19
E
22
E
21
600m E
14
E
15
E
15
E
15
E
17
E
14
E
13
E
14
300m E
9
E
10
E
12
E
11
E
15
E
12
E
11
E
11
Valley E
9
E
10
E
12
E
11
E
15
E
12
E
11
E
12
Wind gust (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m 34 34 33 32 30 25 28 28
600m 22 23 25 23 25 21 22 23
300m 18 19 22 21 24 20 21 21
Valley 18 19 22 20 24 20 20 21

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-2°
-2°
-2°
-2°
-2°
-2°
-2°
-2°
600m
300m
Valley
Freezing Level
600m
500m
500m
500m
500m
600m
600m
500m

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-10°
-11°
-11°
-10°
-10°
-9°
-9°
-10°
600m
-6°
-6°
-6°
-6°
-6°
-4°
-4°
-6°
300m
-1°
-2°
-2°
-2°
-1°
-1°
-2°
Valley
-1°

Additional weather information

Meteorologist's view

The easterly airstream affecting the UK maintains cold conditions in the hills but there should be a little more brightness on offer than on Tuesday. Be prepared for icy surfaces above the freezing level.

Weather

Mostly cloudy overnight with the odd light wintry shower. A largely dry day with bright or sunny intervals developing in the afternoon. An isolated wintry shower is possible.

Chance of cloud-free hill tops

10% becoming 60% by afternoon.

Low cloud and visibility

Areas of cloud and fog above 400 or 500m overnight and to start the morning. Cloud slowly lifting with just patches above 700m by the afternoon. Good visibility below the cloud base with brief reductions in any showers.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Mainly cloudy overnight with isolated wintry showers. A dry day with bright or sunny spells but a chance of some rain, sleet or snow arriving from the southwest late in the evening. Feeling very cold throughout.

Chance of cloud-free hill tops

Generally 80%, but 40% in early hours of morning and late evening.

Maximum wind speed expected

Easterly or southeasterly 20 to 25mph gusts 35mph, increasing to 30mph gusts 45mph later. Severe wind chill.

Temperature

  • At 800m Minus 3C.
  • Valley Plus 1C to 2C, rising to 4 or 5C.
  • Freezing level 200 to 400m.

Low cloud and visibility

Mostly excellent visibility but patchy cloud above 500m in early hours of morning and late evening.

Mountain weather information

Fri 14 Feb

Sunrise:
Sunset:

Cloudy with outbreaks of sleet or snow, turning to rain at most elevations. Bitterly cold conditions with strong southeasterly winds. Freezing level 200 to 400m, rising above summits.

Sat 15 Feb

Sunrise:
Sunset:

Low confidence. Expected to be largely cloudy with patchy rain or summit snow. Very cold with strong to gale force southeast winds.

Sun 16 Feb

Sunrise:
Sunset:

It is likely to remain cold and breezy. Any rain or snow is expected to move away west again to leave dry conditions.

Updated at:

Summit specific forecast

Mountain summit forecast map

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