Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for a cold, initially windy, but mainly dry day Monday but lower for cloud details Tuesday and timing of the rain Wednesday and details generally thereafter.

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.
hazard Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Mountain weather forecast

Mainly dry with sunny spells. Strong winds easing

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Cloudy Cloudy Overcast Cloudy Overcast Overcast
Chance of precipitation
(at 800m)
10% 10% <05% <05% <05% 10%

Wind direction and speed (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m NW
37
NW
33
NW
31
NW
30
NW
27
NW
24
600m NW
25
NW
26
NW
23
NW
23
NW
17
W
13
300m NW
17
NW
19
NW
18
NW
17
NW
11
W
5
Valley NW
17
NW
19
NW
18
NW
17
NW
11
W
6
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m 44 42 39 39 34 29
600m 31 34 30 31 22 17
300m 28 30 28 27 19 12
Valley 28 30 28 27 20 13

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
Valley
Freezing Level
800m
800m
900m
1,000m
1,100m
2,100m

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m
-9°
-8°
-7°
-5°
-5°
-4°
600m
-4°
-4°
-2°
-1°
300m
Valley

Additional weather information

Meteorologist's view

Gusts around 50mph over higher ridges and summits easing around or soon after dawn.

Weather

Clear spells and a few showers overnight, these falling wintry above about 750m. Then a bright, cold morning with sunny spells and perhaps the odd shower, wintry above about 750m, moving through quickly on the strong winds, but most places dry. The afternoon looks dry with good spells of sunshine before cloud increases through the evening, with outbreaks of light rain and drizzle developing towards midnight.

Chance of cloud-free hill tops

Around 75% becoming close to 100% by early-afternoon, chances fall again later in the evening.

Low cloud and visibility

Occasional or periods of cloud above about 750-900m through the morning then lifting above the summits in the afternoon, then becoming periods or persistent cloud above 600m towards midnight. Away from cloud visibility very good, with some good panoramic views of surrounding hills, falling briefly in any showers and several kilometres in rain and drizzle later in evening.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

A mostly cloudy morning with outbreaks of mainly light rain and drizzle, most persistent across western hills with the best of any clearer or brighter spells across the east. It gradually becomes drier through the afternoon with cloud lifting and breaking

Chance of cloud-free hill tops

Little chance in west, but around 40% in east, through the morning improving to 75% through the afternoon.

Maximum wind speed expected

Westerly 20mph gradually easing and backing more southwesterly 10-15mph

Temperature

  • At 800m Around plus 4 Celsius rising to plus 7 or 8 Celsius
  • Valley Around plus 6 or 7 Celsius at dawn rising to plus 13 or 14 Celsius by day
  • Freezing level Above the summits

Low cloud and visibility

Periods or persistent cloud above 450-600m, with patches below, but more occasional above 600-750m at times in the east, becoming occasional above 600-750m generally through the afternoon. Away from cloud visibility good falling to several kilometres in rain and drizzle.

Mountain weather information

Wed 1 Apr

Sunrise:
Sunset:

Cloudy with outbreaks of rain, perhaps heavier in the evening, becoming mainly dry with clearer spells overnight. Fresh southwesterly winds turning northerly and easing. Freezing level falling to 900m later.

Thu 2 Apr

Sunrise:
Sunset:

Probably dry with bright spells at first but outbreaks of rain spreading east in evening. Mainly light and variable winds, becoming southerly later. Freezing level falling to 600m for a time.

Fri 3 Apr

Sunrise:
Sunset:

Rain and summit snow clearing easing, then drier for a time but heavy rain may spread from the west later. Generally light to moderate and variable winds at first but a strengthening southerly wind later. Freezing level 900m falling to 600m, rising again later.

Updated at:

Summit specific forecast

Mountain summit forecast map

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