Mountain weather
Eryri / Snowdonia
Confidence
Generally high but moderate for details of rain on Sunday and moderate for strength of winds on Tuesday.
-
Sat 26 SepSunrise:Sunset:
-
Sun 27 SepSunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Mountain weather forecast
Isolated showers and sunny intervals.
|
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 |
40%
|
30%
|
30%
|
30%
|
30%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | SW 27mph knots
SW
27mph |
SW 25mph knots
SW
25mph |
SW 25mph knots
SW
25mph |
SW 24mph knots
SW
24mph |
SW 26mph knots
SW
26mph |
S 24mph knots
S
24mph |
|
600m
|
600m | SW 16mph knots
SW
16mph |
SW 18mph knots
SW
18mph |
SW 20mph knots
SW
20mph |
SW 20mph knots
SW
20mph |
SW 17mph knots
SW
17mph |
S 17mph knots
S
17mph |
|
300m
|
300m | SW 9mph knots
SW
9mph |
SW 13mph knots
SW
13mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
S 11mph knots
S
11mph |
S 10mph knots
S
10mph |
|
Valley
|
Valley | SW 9mph knots
SW
9mph |
SW 12mph knots
SW
12mph |
SW 14mph knots
SW
14mph |
SW 14mph knots
SW
14mph |
S 10mph knots
S
10mph |
S 10mph knots
S
10mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 34mph | 32mph | 33mph | 33mph | 32mph | 30mph |
|
600m
|
600m | 24mph | 25mph | 28mph | 28mph | 23mph | 23mph |
|
300m
|
300m | 21mph | 22mph | 26mph | 26mph | 21mph | 20mph |
|
Valley
|
Valley | 21mph | 21mph | 25mph | 25mph | 20mph | 19mph |
|
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 |
1900m
|
1900m
|
1900m
|
1900m
|
1900m
|
2000m
|
Additional weather information
Meteorologist's view
Turning into a lovely day for hill walking with nice views of distant hills. Temperatures will feel close to freezing on the exposed summits - so remember some extra layers.
Weather
Any valley mist and fog patches will clear this morning to leave a mainly dry day with sunny intervals and cloudier periods. There's a chance of a few showers too, but these will be brief and mostly light. Feeling pleasantly warm in the sunshine.
Chance of cloud-free hill tops
90%
Low cloud and visibility
Patches of cloud above 700-800m associated with any showers, most likely this afternoon. Generally very good visibility with distant hills clearly visible, but locally poor in cloud/hill fog. Briefly hazy in any rain showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Dry through the early hours with increasing cloud. Outbreaks of rain arrive from the west by mid-morning, turning heavy at times with a low risk of thunder. Rain eases to become light early-afternoon, then clears to the east mid to late afternoon. Dry with clear spells through the evening.
Chance of cloud-free hill tops
60% becoming 20%, increasing to 70% later
Maximum wind speed expected
South 20-25 mph increasing 30-35 mph with gusts 40-45 mph through the morning.
Temperature
- At 800m Plus 6 Celsius rising to plus 9 Celsius.
- Valley Plus 10 Celsius rising to plus 18 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Periods of cloud above 700-800m in association with more prolonged periods of rain, especially early afternoon. Lifting to above the summits by late afternoon. Often hazy in the rain and very poor in cloud/hill fog but briefly very good ahead of the rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 28 Sep
High pressure will bring a mostly dry day with lengthy sunny periods, once any early mist and hill fog has cleared. Light northwesterly winds becoming light to moderate easterly.
Tue 29 Sep
Turning unsettled and windy with strong southeasterly winds developing and a chance of summit gales later. Hill fog and outbreaks of rain, turning heavy, arriving later in the day.
Wed 30 Sep
Overnight rain clearing around dawn to leave a bright and breezy day with sunny spells and scattered heavy showers. Fresh to strong southerly winds.
Mountain weather information
Mon 28 Sep
High pressure will bring a mostly dry day with lengthy sunny periods, once any early mist and hill fog has cleared. Light northwesterly winds becoming light to moderate easterly.
Tue 29 Sep
Turning unsettled and windy with strong southeasterly winds developing and a chance of summit gales later. Hill fog and outbreaks of rain, turning heavy, arriving later in the day.
Wed 30 Sep
Overnight rain clearing around dawn to leave a bright and breezy day with sunny spells and scattered heavy showers. Fresh to strong southerly winds.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations