Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for the mobile nature of the westerly weather patterns, but lowering for the transitional timing detail.

Sunrise:
Sunset:

This evening forecast

Overcast with periods of rain and summit snow, turning heavy at times, with snow level lowering to 600m by midnight. North to northwest summit gales, bringing a severe wind chill effect.

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.

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.

Mountain weather forecast

Snow and rain, generally patchy and light. Summit winds strong 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 Light snow Light snow Cloudy Cloudy Sunny intervals Partly cloudy (night)
Chance of precipitation
(at 800m)
>95% >95% >95% 30% 20% 20% 10% 10%

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 N
30
N
29
N
25
N
20
N
14
N
11
N
9
NE
6
600m N
18
N
19
N
15
N
13
N
11
N
9
N
5
N
4
300m N
13
N
14
N
11
N
10
N
9
N
8
N
4
SE
2
Valley NW
13
NW
13
N
11
N
10
N
9
N
8
N
4
W
2
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 41 38 35 28 21 16 14 8
600m 26 27 22 19 17 14 10 6
300m 25 25 21 18 16 14 8 4
Valley 23 24 21 19 16 14 8 3

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

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
-5°
-5°
-5°
-4°
-3°
-2°
-1°
-2°
300m
-1°
-1°
-2°
-1°
Valley

Additional weather information

Meteorologist's view

Severe wind chill effect extended down to mid-levels.

Weather

Overcast overnight with periods of snow and rain, which turns heavy at times. Snow and rain persistent during the early morning, then patchy from late morning and through the afternoon, then largely dry through the evening. Snow level 500-600m

Chance of cloud-free hill tops

10% becoming 60% from late morning

Low cloud and visibility

Good or very good becoming moderate or poor in rain, very poor in snow and within cloud, which will be extensive from 500m early morning, occasionally so thereafter.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

A rather cloudy day. Largely dry for the morning, then patchy rain increasingly reaching from the south through the afternoon and evening. Moderate winds.

Chance of cloud-free hill tops

50% by day

Maximum wind speed expected

South or southeast 15-20mph

Temperature

  • At 800m Zero Celsius increasing 4 Celsius for the afternoon
  • Valley Plus 1 Celsius increasing 12 Celsius for the afternoon
  • Freezing level 800m at dawn, soon lifting above summits during the morning

Low cloud and visibility

Good or very good becoming moderate or poor in rain, very poor within cloud, which occasionally lowers 600m by day.

Mountain weather information

Sun 8 Mar

Sunrise:
Sunset:

Rather cloudy with some patchy light rain. Fresh winds. Freezing level above summits.

Mon 9 Mar

Sunrise:
Sunset:

Cloudy with occasional rain, though most of this should be light and a chance of some brighter spells later in the day. Light winds. Freezing level above summits.

Tue 10 Mar

Sunrise:
Sunset:

Cloudy with occasional rain, turning heavier later in the day. Summit gales. Freezing level above summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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