Mountain weather

Mountain weather

Eryri / Snowdonia

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Confidence

Very high for a dry, sunny and rather hot week. Moderate for a change to cloudier and much cooler conditions on Friday and through the weekend

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

A sunny day and becoming very warm.

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 SE 17mph knots
SE
17mph
 S 17mph knots
S
17mph
 S 16mph knots
S
16mph
 S 13mph knots
S
13mph
 SW 13mph knots
SW
13mph
 SE 16mph knots
SE
16mph
600m
 600m SE 10mph knots
SE
10mph
 S 13mph knots
S
13mph
 S 15mph knots
S
15mph
 SW 12mph knots
SW
12mph
 W 7mph knots
W
7mph
 S 8mph knots
S
8mph
300m
 300m SE 7mph knots
SE
7mph
 S 8mph knots
S
8mph
 S 11mph knots
S
11mph
 SW 9mph knots
SW
9mph
 W 4mph knots
W
4mph
 S 3mph knots
S
3mph
Valley
 Valley SE 7mph knots
SE
7mph
 S 8mph knots
S
8mph
 S 11mph knots
S
11mph
 SW 8mph knots
SW
8mph
 NW 4mph knots
NW
4mph
 SW 3mph knots
SW
3mph

Wind gust

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 20mph 21mph 21mph 17mph 16mph 19mph
600m
 600m 16mph 17mph 20mph 16mph 10mph 10mph
300m
 300m 14mph 13mph 17mph 13mph 7mph 5mph
Valley
 Valley 14mph 13mph 17mph 13mph 7mph 5mph

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 10 degrees Celsius 12 degrees Celsius 13 degrees Celsius 15 degrees Celsius 15 degrees Celsius 13 degrees Celsius
600m
 600m 14 degrees Celsius 14 degrees Celsius 15 degrees Celsius 17 degrees Celsius 18 degrees Celsius 16 degrees Celsius
300m
 300m 15 degrees Celsius 18 degrees Celsius 19 degrees Celsius 22 degrees Celsius 21 degrees Celsius 18 degrees Celsius
Valley
 Valley 15 degrees Celsius 20 degrees Celsius 21 degrees Celsius 23 degrees Celsius 22 degrees Celsius 19 degrees Celsius
Freezing Level Freezing Level
3400m
3500m
3500m
3500m
3300m
3100m

Additional weather information

Meteorologist's view

A little high wispy cloud may develop at times, but otherwise there will be strong sunshine with very high UV levels during the midday hours. Remember to stay hydrated and to protect your skin from the harmful UV rays. Risk of heat exhaustion if walking through the midday hours.

Weather

Clear skies through the early hours and then a sunny day. Some wispy high cloud is possible at times and this may give a slightly hazier appearance to the sunshine through the afternoon and evening. Feeling very warm. Remaining dry and clear overnight.

Chance of cloud-free hill tops

90%

Low cloud and visibility

A small chance of the odd tuft or ribbon of cloud around the 400m mark at dawn. Otherwise, any cloud will be well above the tops of the summits. Excellent visibilities, though locally poor in cloud first thing.

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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