Mountain weather
Eryri / Snowdonia
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
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This eveningSunrise:Sunset:
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Tue 11 AugSunrise:Sunset:
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Wed 12 AugSunrise:Sunset:
-
Further outlook
This evening forecast
Dry and mostly sunny this evening and then clear skies after dark.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Mountain weather forecast
A sunny day and becoming very warm.
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Time
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Time |
00:00
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03:00
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06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
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|---|---|---|---|---|---|---|---|---|---|
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Weather
(at 800m)
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Weather symbols |  |
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 |
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Chance of
precipitation (at 800m)
|
Chance of precipitation |
<5%
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<5%
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<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | SE 13mph knots
SE
13mph |
SE 13mph knots
SE
13mph |
SE 16mph knots
SE
16mph |
S 16mph knots
S
16mph |
S 16mph knots
S
16mph |
SW 13mph knots
SW
13mph |
SW 12mph knots
SW
12mph |
SE 14mph knots
SE
14mph |
|
600m
|
600m | SE 9mph knots
SE
9mph |
SE 10mph knots
SE
10mph |
SE 9mph knots
SE
9mph |
S 13mph knots
S
13mph |
S 15mph knots
S
15mph |
SW 12mph knots
SW
12mph |
SW 7mph knots
SW
7mph |
SE 8mph knots
SE
8mph |
|
300m
|
300m | SE 6mph knots
SE
6mph |
SE 7mph knots
SE
7mph |
SE 6mph knots
SE
6mph |
S 8mph knots
S
8mph |
S 11mph knots
S
11mph |
SW 8mph knots
SW
8mph |
W 4mph knots
W
4mph |
SE 3mph knots
SE
3mph |
|
Valley
|
Valley | SE 5mph knots
SE
5mph |
SE 7mph knots
SE
7mph |
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 |
S 2mph knots
S
2mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 16mph | 16mph | 19mph | 20mph | 21mph | 18mph | 15mph | 17mph |
|
600m
|
600m | 11mph | 13mph | 15mph | 17mph | 20mph | 17mph | 10mph | 10mph |
|
300m
|
300m | 11mph | 12mph | 13mph | 13mph | 17mph | 14mph | 6mph | 5mph |
|
Valley
|
Valley | 10mph | 12mph | 14mph | 14mph | 17mph | 13mph | 6mph | 4mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||||
|
600m
|
600m | ||||||||
|
300m
|
300m | ||||||||
|
Valley
|
Valley | ||||||||
| Freezing Level | Freezing Level |
3500m
|
3400m
|
3500m
|
3500m
|
3500m
|
3500m
|
3300m
|
3000m
|
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 off 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/
Mountain weather information
Weather
Another sunny and very warm day and feeling increasingly hot, especially on south facing slopes through the midday hours. Some cloud is likely at times, perhaps more especially during the evening.
Chance of cloud-free hill tops
95%
Maximum wind speed expected
Southerly 10-15 mph, becoming westerly later.
Temperature
- At 800m Plus 13 Celsius rising to plus 26 Celsius.
- Valley Plus 10 Celsius rising to plus 31 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Any cloud is expected to be well above the summits. Very good visibilities but distant landmarks and hills may appear slightly hazy.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 13 Aug
Very hot and sunny but perhaps turning somewhat cloudier by the evening. Light to moderate southerly winds.
Fri 14 Aug
Probably a cloudier and much cooler day but still with some warm sunny spells at times. Periods of hill fog are possible, mainly in the west. The small chance of a shower. Light to moderate westerly winds.
Sat 15 Aug
Mostly dry with a mixture of cloud and sunny spells and a small chance of a shower. Light to moderate westerly winds.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations