Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

A dry and settled day on Tuesday before a return to unsettled, wet conditions on Wednesday and Thursday, with strong southwesterly winds and some localised flooding possible. Uncertainty towards the end of the week but strong winds and further rain likely.

Sunrise:
Sunset:

This evening forecast

A cloudy evening with light northwesterly winds, risk of a few showers early on but drier later with clear spells developing.

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.

Mountain weather forecast

A dry and bright day with sunny spells and mainly light winds.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Partly cloudy (night) Partly cloudy (night) Partly cloudy (night) Sunny intervals Sunny intervals Sunny day Clear night Clear night
Chance of precipitation
(at 800m)
10% 10% <05% <05% <05% <05% <05% <05%

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 NW
14
NW
16
NW
15
W
14
W
13
SW
15
SW
16
S
21
600m NW
6
NW
8
NW
8
W
6
SW
8
SW
10
S
12
S
15
300m NW
3
NW
4
NW
3
SW
2
SW
3
SW
5
S
6
S
9
Valley NW
3
NW
4
W
3
SW
3
SW
4
SW
5
S
7
S
9
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 18 19 18 16 16 18 20 26
600m 9 12 11 8 10 13 15 19
300m 7 10 8 5 6 11 13 17
Valley 8 10 8 5 7 12 13 18

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
Valley
Freezing Level
1,000m
1,000m
900m
900m
900m
900m
800m
900m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-4°
-4°
-5°
-5°
-4°
-5°
-5°
-6°
600m
-2°
-2°
300m
Valley

Additional weather information

Meteorologist's view

Nothing to add.

Weather

Clear spells overnight and perhaps a frost in some glens. A mostly dry day with plenty of winter sunshine. Still feeling cool out on the hills.

Chance of cloud-free hill tops

90%

Low cloud and visibility

Patches of low cloud early in the morning around 7-800m, perhaps lingering around northern hills during the morning. Good visibility expected.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Dry overnight but low cloud gathering as a band of rain spreads across the Snowdonia during the morning, becoming persistent and heavy at times during the day. The rain will be accompanied but strong southerly winds, gales likely in the afternoon. Rain easing during the evening

Chance of cloud-free hill tops

80% falling to 30% associated with rain.

Maximum wind speed expected

Southerly 25-30mph with gusts 40-45mph

Temperature

  • At 800m Plus 2 rising to 5 Celsius.
  • Valley Plus 6 Celsius rising to 11 Celsius.
  • Freezing level 1000m rising above all summits.

Low cloud and visibility

Patchy cloud above 600m will become scattered or broken during the morning over the tops, cloud bases will lower during the day, particularly around western mountains. Cloud overcast layers above 400m during the afternoon. Visibility will be good around dawn but becoming moderate or poor in rain later.

Mountain weather information

Thu 18 Dec

Sunrise:
Sunset:

Dry for a time in the morning but early mist and low cloud will be persistent. Further rain expected by mid-morning becoming persistent and heavy at times for a few hours, perhaps turning wintry on the higher tops during the evening as freezing level lowers to 900m. Fresh southwesterly winds expected.

Fri 19 Dec

Sunrise:
Sunset:

A drier day with sunny spells, strong southwesterly winds are likely, rain expected during the evening. Freezing level around 1000m

Sat 20 Dec

Sunrise:
Sunset:

Strong southwesterly winds, risk of gales, bands of rain likely, perhaps turning wintry on the tops.

Updated at:

Summit specific forecast

Mountain summit forecast map

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