Mountain weather

Mountain weather

Eryri / Snowdonia

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Confidence

High overall.

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 dry and bright day with plenty of lengthy sunshine. Moderate to strong easterly winds.

Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
 Weather symbols Sunny Sunny Sunny intervals Sunny Sunny intervals Clear 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 E 25mph knots
E
25mph
 E 24mph knots
E
24mph
 E 19mph knots
E
19mph
 E 16mph knots
E
16mph
 NE 19mph knots
NE
19mph
 E 24mph knots
E
24mph
600m
 600m E 14mph knots
E
14mph
 E 14mph knots
E
14mph
 E 14mph knots
E
14mph
 NE 13mph knots
NE
13mph
 NE 11mph knots
NE
11mph
 E 13mph knots
E
13mph
300m
 300m E 8mph knots
E
8mph
 E 9mph knots
E
9mph
 E 10mph knots
E
10mph
 NE 9mph knots
NE
9mph
 NE 8mph knots
NE
8mph
 E 9mph knots
E
9mph
Valley
 Valley E 7mph knots
E
7mph
 E 8mph knots
E
8mph
 E 10mph knots
E
10mph
 NE 9mph knots
NE
9mph
 NE 9mph knots
NE
9mph
 E 10mph knots
E
10mph

Wind gust

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 31mph 32mph 28mph 25mph 25mph 33mph
600m
 600m 21mph 22mph 22mph 21mph 18mph 24mph
300m
 300m 16mph 18mph 19mph 17mph 14mph 20mph
Valley
 Valley 14mph 17mph 18mph 17mph 16mph 20mph

Altitude above mean sea level
Time
 Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
 900m 7 degrees Celsius 9 degrees Celsius 12 degrees Celsius 14 degrees Celsius 14 degrees Celsius 11 degrees Celsius
600m
 600m 10 degrees Celsius 12 degrees Celsius 15 degrees Celsius 18 degrees Celsius 18 degrees Celsius 16 degrees Celsius
300m
 300m 13 degrees Celsius 16 degrees Celsius 19 degrees Celsius 21 degrees Celsius 22 degrees Celsius 18 degrees Celsius
Valley
 Valley 15 degrees Celsius 17 degrees Celsius 20 degrees Celsius 22 degrees Celsius 22 degrees Celsius 19 degrees Celsius
Freezing Level Freezing Level
2300m
2600m
2600m
2700m
2800m
2700m

Additional weather information

Meteorologist's view

A brilliant day to be in the national park. However, applying sunscreen regularly is advised as well as wearing a hat and sunglasses because UV levels will be very high. High temperatures, especially during the afternoon, may lead to heat exhaustion. Keep hydrated by drink plenty of water, and taking regular breaks from strenuous activity.

Weather

A dry and bright day with lengthy sunshine. The potential for some patchy cloud at times, mainly across the east of the National Park in the early morning. Sunny spells by the afternoon. Brisk easterly winds easing slightly.

Chance of cloud-free hill tops

80% rising to >95%.

Low cloud and visibility

Low cloud across eastern parts in the morning, otherwise no low cloud or visibility issues expected. Excellent visibilities with views of distant peaks possible.

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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