Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for mainly dry weather with limited showers Tuesday, then generally more unsettled from Wednesday, but lowering for detail of intensity and timing of worst of the weather.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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

Any early rain clearing to sunny spells and isolated showers.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Light rain Overcast Sunny intervals Light shower (day) Cloudy Light rain
Chance of precipitation
(at 800m)
30% 10% 10% 20% 30% 60%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m W
24
W
16
W
15
SW
11
S
10
SE
11
600m W
18
W
13
W
13
SW
9
S
7
SE
7
300m SW
11
SW
9
W
9
SW
6
S
4
SE
4
Valley W
11
SW
9
W
9
W
6
SE
4
SE
4
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m 29 21 21 15 13 13
600m 22 17 19 13 11 10
300m 20 14 15 11 9 8
Valley 20 15 15 10 8 8

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
10°
10°
Valley
10°
10°
11°
11°
10°
10°
Freezing Level
1,500m
1,400m
1,400m
1,400m
1,300m
1,400m

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
-1°
-1°
600m
300m
Valley
10°

Additional weather information

Meteorologist's view

A largely fine day, once early cloud lifts, but always the risk of the odd shower. Despite mild temperatures at lower levels and relatively light winds, still feeling chilly on the tops.

Weather

Any early rain soon clearing. A day of isolated light showers and limited brighter spells then follows. Any sunshine turning rather hazy due to high cloud, however. Low cloud building through evening with rain reaching from the south before midnight.

Chance of cloud-free hill tops

40% at first, rising to 70% by the afternoon, falling to 20% after dark.

Low cloud and visibility

Cloud obscuring hills from above 600m during the morning, but lifting and breaking to be patchy above 900m by the afternoon. Low cloud returning from the southwest after dark, obscuring the odd hill above 600m, with some patches down to 400m. Outside of cloud mostly good visibility through the day, but becoming moderate during rain.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Overcast start to the day with rain at times, along with some heavier outbreaks. Erratically turning drier from the west from late morning and through the afternoon with the chance of some late brighter spells appearing.

Chance of cloud-free hill tops

10% becoming 30% by late afternoon

Maximum wind speed expected

Variable 15mph or less

Temperature

  • At 800m Plus 4 Celsius
  • Valley Plus 5 Celsius increasing to Plus 15 Celsius
  • Freezing level Above summits

Low cloud and visibility

Extensive low cloud will obscure routes above 500m for much of the day. The odd patch possible down to 300m in the west during the morning. Perhaps the odd break across eastern hills by the afternoon. Outside of cloud, visibility moderate to poor in the early rain, but improving to be good as drier weather moves in.

Mountain weather information

Thu 21 Mar

Sunrise:
Sunset:

Cloudy and windy, but mostly dry. Rain spreading south later in the day, turning persistent from across western hills, with southwesterly gales on summits. Freezing level above all peaks.

Fri 22 Mar

Sunrise:
Sunset:

Sunshine and showers with blustery winds. Showers frequent and heavy at times, with a risk of hail, and also increasingly turning to snow above 700m. Freezing level lowering to 800m.

Sat 23 Mar

Sunrise:
Sunset:

Another day of sunshine and showers, with strong blustery winds, and snow on summits. Freezing level initially around 600m, but rising to 1000m as showers merge to give more frequent rain around midday

Updated at:

Summit specific forecast

Mountain summit forecast map

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