Mountain weather
Eryri / Snowdonia
Confidence
Moderate for cloud amounts on Saturday. High for an increasingly settled, sunny and very warm bank holiday weekend.
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This eveningSunrise:Sunset:
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Sat 23 MaySunrise:Sunset:
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Sun 24 MaySunrise:Sunset:
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Further outlook
This evening forecast
Turning greyer for Friday evening with cloud lowering over the summits. Patchy outbreaks of light rain moving across the region.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Poor Visibility
Mountain weather forecast
Low cloud and hill fog lifting to bright spells.
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
20%
|
30%
|
20%
|
10%
|
10%
|
10%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | SW 23mph knots
SW
23mph |
SW 18mph knots
SW
18mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 16mph knots
SW
16mph |
SW 15mph knots
SW
15mph |
SW 14mph knots
SW
14mph |
SW 15mph knots
SW
15mph |
|
600m
|
600m | S 14mph knots
S
14mph |
S 13mph knots
S
13mph |
SW 14mph knots
SW
14mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
S 13mph knots
S
13mph |
S 12mph knots
S
12mph |
|
300m
|
300m | S 9mph knots
S
9mph |
S 8mph knots
S
8mph |
S 9mph knots
S
9mph |
SW 10mph knots
SW
10mph |
SW 10mph knots
SW
10mph |
SW 10mph knots
SW
10mph |
S 9mph knots
S
9mph |
S 7mph knots
S
7mph |
|
Valley
|
Valley | S 9mph knots
S
9mph |
S 8mph knots
S
8mph |
S 8mph knots
S
8mph |
SW 9mph knots
SW
9mph |
SW 10mph knots
SW
10mph |
SW 10mph knots
SW
10mph |
S 8mph knots
S
8mph |
S 7mph knots
S
7mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 28mph | 21mph | 20mph | 20mph | 22mph | 21mph | 18mph | 19mph |
|
600m
|
600m | 19mph | 17mph | 19mph | 20mph | 21mph | 21mph | 18mph | 15mph |
|
300m
|
300m | 14mph | 14mph | 14mph | 15mph | 16mph | 16mph | 14mph | 14mph |
|
Valley
|
Valley | 14mph | 14mph | 13mph | 14mph | 15mph | 15mph | 13mph | 14mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C |
|
Valley
|
Valley | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 12 degrees Celsius 12°C |
| Freezing Level | Freezing Level |
2700m
|
2400m
|
1800m
|
1700m
|
1700m
|
1700m
|
1800m
|
2000m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
2700m
|
2400m
|
1800m
|
1700m
|
1700m
|
1700m
|
1800m
|
2000m
|
Additional weather information
Meteorologist's view
A fine day to be on the hills once morning cloud has cleared. Don't get caught out by high UV levels in the afternoon even if sunshine is hazy.
Weather
Murky start on the hills with hill fog and low cloud bringing patchy drizzle and light rain during the early hours. This eventually lifting to allow brighter spells to emerge in the afternoon, though sunshine may still be hazy at times as a result of high-based cloud.
Chance of cloud-free hill tops
40% to begin, rising to 90% for the afternoon.
Low cloud and visibility
Cloud dropping to 300-400m during the early hours, resulting in poor visibility on the hills. This lifting during the morning, taking longest on western slopes, eventually rising above the summits by the afternoon with very good visibility.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Isolated valley fog patches at first, but otherwise a fine day across the park with largely clear skies. Feeling very warm in the strong sunshine with high UV levels.
Chance of cloud-free hill tops
70% on western slopes initially. Otherwise, 100%.
Maximum wind speed expected
15mph southerly winds on the summits.
Temperature
- At 800m Plus 8 Celsius, rising to plus 15 Celsius.
- Valley Plus 10 Celsius, rising to plus 21 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Patchy low cloud at 400m drifting into western slopes during the early hours. This quickly clearing after dawn, with widespread clear skies from then on.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 25 May
High pressure results in a settled and sunny bank holiday Monday with widespread blue skies and a gentle breeze. High UV levels and feeling very warm.
Tue 26 May
Remaining fine and dry across the park. A few early morning fog patches in the valley. Light easterly winds.
Wed 27 May
Another widely sunny day as high pressure remains in charge. Still very warm for late May with high UV levels, though slightly breezier with moderate southeasterly winds on the hills.
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.