Mountain weather
Eryri / Snowdonia
Confidence
High confidence for an unsettled period with heavy rain, thundery in places, followed by showers. Lower for distribution of any thundery downpours.
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Fri 28 AugSunrise:Sunset:
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Sat 29 AugSunrise:Sunset:
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Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Thunderstorms
Strong Sunlight
Mountain weather forecast
A rather unsettled day with showery outbreaks, these possible heavy and thundery.
|
Time
|
Time |
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 |
60%
|
60%
|
40%
|
40%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | SW 14mph knots
SW
14mph |
W 13mph knots
W
13mph |
W 18mph knots
W
18mph |
W 19mph knots
W
19mph |
W 15mph knots
W
15mph |
SW 18mph knots
SW
18mph |
|
600m
|
600m | S 11mph knots
S
11mph |
W 9mph knots
W
9mph |
W 13mph knots
W
13mph |
W 14mph knots
W
14mph |
SW 12mph knots
SW
12mph |
S 12mph knots
S
12mph |
|
300m
|
300m | S 6mph knots
S
6mph |
W 7mph knots
W
7mph |
W 10mph knots
W
10mph |
W 10mph knots
W
10mph |
SW 7mph knots
SW
7mph |
S 8mph knots
S
8mph |
|
Valley
|
Valley | S 6mph knots
S
6mph |
W 7mph knots
W
7mph |
W 10mph knots
W
10mph |
W 10mph knots
W
10mph |
SW 7mph knots
SW
7mph |
S 8mph knots
S
8mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 18mph | 17mph | 23mph | 25mph | 20mph | 23mph |
|
600m
|
600m | 14mph | 12mph | 18mph | 19mph | 16mph | 16mph |
|
300m
|
300m | 12mph | 10mph | 15mph | 16mph | 13mph | 15mph |
|
Valley
|
Valley | 12mph | 10mph | 15mph | 15mph | 13mph | 15mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||
|
600m
|
600m | ||||||
|
300m
|
300m | ||||||
|
Valley
|
Valley | ||||||
| Freezing Level | Freezing Level |
2700m
|
2800m
|
2900m
|
2700m
|
2700m
|
2700m
|
Additional weather information
Meteorologist's view
Low cloud may make navigation difficult on the highest peaks through much of the day. Heavy showers may also lead to challenging navigation, with waterproofs being advisable. Hail and lightning also an additional hazard.
Weather
A rather cloudy day ahead with showers likely through much of the morning and afternoon, these may be heavy and thundery at times, although there is still rather low confidence in the timing and location of heaviest downpours. Shower and thundery storm risk reduced through the afternoon with the odd brighter break possible.
Chance of cloud-free hill tops
<10% rising to 50% into the afternoon before dropping back to 10% from dusk.
Low cloud and visibility
Extensive low cloud around for much of the morning with bases between 500-600m, this will shroud highest peaks at times. Through the afternoon main cloud bases are expected to be above summits although some patchy cloud may drift across peaks through the afternoon with some brighter periods possible. Patchy cloud is expected to reform into the evening once again obstructing the highest routes. Generally good visibilities expected, but may be poor or very poor in low cloud or hill fog. Visibilities may drop to moderate or poor in heavy downpours.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy and wet start to the day as a band of rain moves in from the southwest. Persistent rain gradually moves away, but is quickly replaced by showers, a few of these may be heavy. Skies are expected to remain rather cloudy throughout the afternoon.
Chance of cloud-free hill tops
20% rising to 40% through the afternoon, before dropping back down to 10% through the evening.
Maximum wind speed expected
Southerly 20-25 mph.
Temperature
- At 800m Plus 6 Celsius rising to Plus 10 Celsius.
- Valley Plus 14 Celsius rising to Plus 18 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Extensive low cloud initially with bases between 400-600m, this is likely to shroud highest peaks. This is expected to turn patchier in nature through the afternoon, main cloud bases are expected to be above summits although some patchy cloud may drift across peaks through the afternoon. Lower cloud with bases above 400-600m. Generally good visibilities expected, but may be poor or very poor in low cloud or hill fog. Visibilities may drop to moderate or poor in heavy downpours.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sun 30 Aug
Another showery day to come, some of these potentially heavy and thundery in nature. Fresh often gusty southwesterly winds.
Mon 31 Aug
A drier and brighter day ahead but some isolated showers still possible. Fresh to occasionally strong westerly winds.
Tue 1 Sep
A band of showery rain and cloud likely to cross the area through the morning with skies turning drier and brighter later.
Mountain weather information
Sun 30 Aug
Another showery day to come, some of these potentially heavy and thundery in nature. Fresh often gusty southwesterly winds.
Mon 31 Aug
A drier and brighter day ahead but some isolated showers still possible. Fresh to occasionally strong westerly winds.
Tue 1 Sep
A band of showery rain and cloud likely to cross the area through the morning with skies turning drier and brighter later.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations