Mountain weather

Eryri / Snowdonia

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Eryri / Snowdonia Mountain weather forecast table

Confidence

High for east to southeast flow persisting also for occasionally unsettled, but lowering for timing detail of worst of conditions.

Sunrise:
Sunset:

This evening forecast

Cloudy with occasional light patchy rain and summit snow which will be focused across the east of the Park. Cold in the gale, perhaps storm force, easterly summit winds. Freezing level 700-800m

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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.

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 Storm Force Winds
Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.
Mountain hazards explained

Mountain weather forecast

Cloudy with occasional snow and rain. Severe wind chill. Gale, perhaps storm force summit winds.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
 Light snow Light snow Light snow Heavy snow Heavy snow Light snow Light snow Light snow
Chance of precipitation
(at 800m)
 70% 50% 60% 70% 70% 70% 70% 40%

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
46
 E
46
 E
44
 E
41
 E
36
 E
32
 E
31
 E
26
600m E
33
 E
31
 E
27
 E
25
 E
24
 E
20
 E
20
 E
17
300m E
21
 E
22
 E
21
 E
21
 E
20
 E
15
 E
14
 E
12
Valley E
20
 E
21
 E
21
 E
20
 E
19
 E
15
 E
14
 E
11
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 56 56 55 53 46 41 41 34
600m 44 45 43 42 38 32 33 29
300m 40 40 40 39 36 29 29 24
Valley 39 39 39 38 35 28 28 23

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
0°
-1°
-1°
-2°
-2°
-2°
-2°
-2°
600m
2°
2°
1°
0°
0°
0°
0°
0°
300m
4°
4°
4°
3°
3°
3°
2°
2°
Valley
5°
5°
5°
4°
4°
4°
3°
3°
Freezing Level
800m
800m
700m
600m
600m
600m
500m
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°
-11°
-12°
-12°
-11°
-11°
-10°
600m
-6°
-6°
-6°
-7°
-7°
-6°
-6°
-6°
300m
-2°
-2°
-2°
-3°
-3°
-2°
-3°
-3°
Valley
0°
0°
0°
-1°
-1°
0°
-1°
-1°

Additional weather information

Meteorologist's view

Be prepared for winter conditions with snow and severe wind chill in summit gales that perhaps reach storm force. Low cloud will bring navigational difficulties.

Weather

A rather cloudy day with occasional outbreaks of snow and rain, focused across eastern and southern areas of the Park. Best chance of seeing limited brighter spells will be towards Carnedd Liewelyn. Snow level around 400m.

Chance of cloud-free hill tops

10-20% in south 30% in north

Low cloud and visibility

Moderate or poor in rain, very poor in snow and within cloud with bases quite extensive from around 500m particularly in the south

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Overcast start with periods of snow, below 400m rain. Outbreaks turning lighter and more patchy from the south late morning, as the snow level lifts to 700m for the afternoon. Continuing cold in the strong summit winds.

Chance of cloud-free hill tops

20% becoming 40% for the afternoon

Maximum wind speed expected

Easterly increasing 30-35 mph by late afternoon with gusts reaching 50mph across more exposed ridges and summits.

Temperature

  • At 800m Minus 1 Celsius increasing plus 2 Celsius by late afternoon
  • Valley Plus 3 rising to 9 Celsius for the afternoon
  • Freezing level 600m lifting 900m by late afternoon

Low cloud and visibility

Moderate or poor in rain, very poor in snow and within cloud with bases extensive from around 500m at first, before lifting and breaking a little for the afternoon.

Mountain weather information

Thu 5 Feb

Sunrise:
Sunset:

Periods of snow, below 700m rain, most persistent in the east. Strong easterly summit winds.

Fri 6 Feb

Sunrise:
Sunset:

Patchy snow, below 700m rain, focused in the east. Strong to gale easterly summit winds.

Sat 7 Feb

Sunrise:
Sunset:

Occasional rain and summit snow, most persistent in the east. Moderate easterly summit winds.

Updated at:
Mountain weather explained

Summit specific forecast

Mountain summit forecast map

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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.

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