Mountain weather

Mountain weather

Eryri / Snowdonia

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Confidence

High for a very warm and sunny few days to come. Low for the potential of any isolated showers from Tuesday onwards.

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.
Updated: 
Mountain hazards explained

Mountain weather forecast

Hot and sunny bank holiday.

Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
 Weather symbols Sunny Sunny Sunny Sunny Sunny Clear night
Chance of
precipitation
(at 800m)
 Chance of precipitation
<5%
<5%
<5%
<5%
<5%
<5%

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 SW 11mph knots
SW
11mph
 S 14mph knots
S
14mph
 SW 14mph knots
SW
14mph
 SW 15mph knots
SW
15mph
 W 10mph knots
W
10mph
 S 12mph knots
S
12mph
600m
 600m S 10mph knots
S
10mph
 S 13mph knots
S
13mph
 SW 13mph knots
SW
13mph
 SW 13mph knots
SW
13mph
 W 7mph knots
W
7mph
 S 8mph knots
S
8mph
300m
 300m S 4mph knots
S
4mph
 S 6mph knots
S
6mph
 SW 9mph knots
SW
9mph
 SW 8mph knots
SW
8mph
 W 4mph knots
W
4mph
 SE 3mph knots
SE
3mph
Valley
 Valley S 4mph knots
S
4mph
 S 6mph knots
S
6mph
 SW 9mph knots
SW
9mph
 SW 8mph knots
SW
8mph
 NW 3mph knots
NW
3mph
 SE 3mph knots
SE
3mph

Wind gust

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 12mph 17mph 19mph 20mph 13mph 14mph
600m
 600m 12mph 16mph 18mph 18mph 10mph 10mph
300m
 300m 6mph 10mph 14mph 13mph 6mph 5mph
Valley
 Valley 6mph 10mph 13mph 13mph 5mph 5mph

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 17 degrees Celsius 16 degrees Celsius 17 degrees Celsius 18 degrees Celsius 18 degrees Celsius 16 degrees Celsius
600m
 600m 18 degrees Celsius 19 degrees Celsius 20 degrees Celsius 21 degrees Celsius 22 degrees Celsius 20 degrees Celsius
300m
 300m 22 degrees Celsius 23 degrees Celsius 24 degrees Celsius 26 degrees Celsius 25 degrees Celsius 22 degrees Celsius
Valley
 Valley 21 degrees Celsius 24 degrees Celsius 25 degrees Celsius 26 degrees Celsius 25 degrees Celsius 23 degrees Celsius
Freezing Level Freezing Level
3000m
2900m
2800m
2800m
2800m
2700m

Additional weather information

Meteorologist's view

Ensure to stay hydrated and wear appropriate skin protection when out enjoying the widespread sunshine. High pollen levels.

Weather

Any valley mist rapidly clearing after dawn to leave a widely sunny and unseasonably hot day for late May.

Chance of cloud-free hill tops

100%

Low cloud and visibility

A few fair weather clouds may form well above the summits around the middle of the day but otherwise little if any cloud is expected. Generally good visibilities but nearby hills and landmarks will appear hazy and distant hills will be faint or obscured by haze. Reduced air quality is likely.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast

The Eryri (Snowdonia) mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Yr Wyddfa (Snowdon), standing at 1,085 metres.

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