Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for Friday. Low for extent of any showers over the weekend and early next week.

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

Early wintry showers, otherwise dry and cold.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Light snow Cloudy Fog Cloudy Light snow Light snow
Chance of precipitation
(at 800m)
30% 20% 10% 10% 10% 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 S
27
S
29
S
30
S
30
SE
33
SE
31
600m S
18
S
20
S
22
S
22
SE
22
SE
22
300m S
11
S
13
S
15
S
15
SE
14
SE
14
Valley S
11
S
13
S
15
SE
14
SE
15
SE
14
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m 32 34 36 37 40 38
600m 23 27 28 29 30 30
300m 21 25 26 25 27 27
Valley 21 25 26 25 27 27

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

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m
-7°
-8°
-7°
-6°
-7°
-7°
600m
-4°
-4°
-3°
-2°
-3°
-3°
300m
Valley

Additional weather information

Meteorologist's view

Strengthening summit winds developing from late afternoon onwards.

Weather

Misty with valley fog in east at first. Frost most probable in west. Clouding over with showers until mid-morning, these falling as sleet and wet snow above 800 metres. Then the rest of the day will be mostly dry with variable cloud cover, and some bright or sunny spells.

Chance of cloud-free hill tops

60%.

Low cloud and visibility

Scattered bases 700 metres as showers pass by, otherwise only small amounts of summit cloud with good visibility.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Rather cloudy at times with passing showers, these most likely first thing in the morning with snow above 900 metres. More in the way of brighter skies and fewer showers in the afternoon.

Chance of cloud-free hill tops

50%, best chance in the afternoon across the north of the Park.

Maximum wind speed expected

South-easterly with summit gusts reaching 30-35mph.

Temperature

  • At 800m Plus 1 Celsius.
  • Valley Plus 3 rising to 7 Celsius.
  • Freezing level Above the summits.

Low cloud and visibility

Poor in areas of cloud down to 700 metres as showers pass by, otherwise good visibility with patchy cloud above 800 metres.

Mountain weather information

Sun 18 Jan

Sunrise:
Sunset:

Mainly dry with variable amounts of cloud.

Mon 19 Jan

Sunrise:
Sunset:

Some drier spells of weather and a chance of showers, wintry on the higher tops.

Tue 20 Jan

Sunrise:
Sunset:

Little change, still a chance of showers but spells of dry weather too.

Updated at:

Summit specific forecast

Mountain summit forecast map

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