Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High for a generally dry day on Saturday. Moderate for extent and timing of early rain on Sunday.

Sunrise: Sunset:
Sunrise: Sunset:
Mountain hazards

Mountain weather hazards

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

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.

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

Dry but cloudy at times, with occasional sunny intervals.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Cloudy Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy (night)
Chance of
precipitation
(at 800m)
Chance of precipitation
10%
10%
10%
10%
10%
10%

Wind direction and speed

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m W 24mph knots
W
24mph
W 17mph knots
W
17mph
W 16mph knots
W
16mph
SW 17mph knots
SW
17mph
SW 17mph knots
SW
17mph
S 20mph knots
S
20mph
600m
600m W 13mph knots
W
13mph
W 12mph knots
W
12mph
W 13mph knots
W
13mph
SW 13mph knots
SW
13mph
SW 12mph knots
SW
12mph
S 12mph knots
S
12mph
300m
300m W 7mph knots
W
7mph
W 9mph knots
W
9mph
W 9mph knots
W
9mph
SW 9mph knots
SW
9mph
SW 8mph knots
SW
8mph
S 6mph knots
S
6mph
Valley
Valley W 7mph knots
W
7mph
W 9mph knots
W
9mph
W 9mph knots
W
9mph
SW 9mph knots
SW
9mph
SW 7mph knots
SW
7mph
S 6mph knots
S
6mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 28mph 22mph 21mph 22mph 21mph 24mph
600m
600m 17mph 16mph 17mph 17mph 17mph 16mph
300m
300m 15mph 14mph 15mph 15mph 15mph 14mph
Valley
Valley 15mph 15mph 15mph 15mph 14mph 14mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 2 degrees Celsius 3 degrees Celsius 5 degrees Celsius 5 degrees Celsius 4 degrees Celsius 4 degrees Celsius
600m
600m 6 degrees Celsius 7 degrees Celsius 9 degrees Celsius 9 degrees Celsius 8 degrees Celsius 8 degrees Celsius
300m
300m 10 degrees Celsius 11 degrees Celsius 12 degrees Celsius 12 degrees Celsius 12 degrees Celsius 12 degrees Celsius
Valley
Valley 12 degrees Celsius 13 degrees Celsius 14 degrees Celsius 14 degrees Celsius 14 degrees Celsius 13 degrees Celsius
Freezing Level Freezing Level
2000m
2000m
2100m
2100m
2000m
3700m

Additional weather information

Meteorologist's view

A fine day for hill walking but remember some extra layers if you are heading to the summits as it will feel chilly in the breeze. The breaks in the cloud will allow higher UV so sun protection may be needed.

Weather

Cloudy with the odd shower possible through the early hours but by dawn it will likely be dry. Quite large amounts of cloud through the day but this will break up by the afternoon to give occasional sunny spells.

Chance of cloud-free hill tops

70% becoming 90%

Low cloud and visibility

Patches of cloud above 700m during the morning, perhaps more extensive and prolonged across the Yr Wyddfa range until mid-morning. Lifting to above summits by the afternoon. Poor or very poor visibility in the cloud but otherwise very good with excellent air clarity.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast