Mountain weather
Eryri / Snowdonia
Confidence
Generally high for general weather story, lower for cloud and rain detail Friday.
-
Thu 24 SepSunrise:Sunset:
-
Fri 25 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
A dry and bright day with lengthy sunny spells.
|
Time
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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 |
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | SE 20mph knots
SE
20mph |
S 26mph knots
S
26mph |
S 25mph knots
S
25mph |
SW 27mph knots
SW
27mph |
SW 29mph knots
SW
29mph |
SW 29mph knots
SW
29mph |
|
600m
|
600m | SE 13mph knots
SE
13mph |
S 16mph knots
S
16mph |
S 22mph knots
S
22mph |
S 22mph knots
S
22mph |
S 19mph knots
S
19mph |
SW 19mph knots
SW
19mph |
|
300m
|
300m | SE 8mph knots
SE
8mph |
S 9mph knots
S
9mph |
S 16mph knots
S
16mph |
S 16mph knots
S
16mph |
S 12mph knots
S
12mph |
SW 13mph knots
SW
13mph |
|
Valley
|
Valley | SE 8mph knots
SE
8mph |
S 9mph knots
S
9mph |
S 15mph knots
S
15mph |
S 15mph knots
S
15mph |
S 10mph knots
S
10mph |
SW 10mph knots
SW
10mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 24mph | 31mph | 33mph | 36mph | 35mph | 36mph |
|
600m
|
600m | 20mph | 23mph | 30mph | 31mph | 26mph | 26mph |
|
300m
|
300m | 17mph | 17mph | 26mph | 27mph | 22mph | 23mph |
|
Valley
|
Valley | 17mph | 17mph | 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 |
2200m
|
2300m
|
3000m
|
2800m
|
2800m
|
2700m
|
Additional weather information
Meteorologist's view
A great day to be in the national park with plenty of dry and bright weather although winds will strengthen through the day, particularly over the summits. UV levels are still expected to be moderate or high and so sun protection is still advised. Conditions will deteriorate later as cloud develops.
Weather
A chilly but dry start to the day, with a chance of some isolated valley fog initially. A settled day ahead with variable high-level cloud expected throughout and bright or sunny spells likely. Cloud likely increasing from the northwest through the evening. Fresh winds across the summits at times.
Chance of cloud-free hill tops
>95% reducing to 40% through the late evening in the northwest.
Low cloud and visibility
Low risk of patchy valley mist of fog initially which will allow for poor or very poor visibilities. Little, if any, low cloud expected with all cloud above summits, very good or excellent visibilities expected with views of distant peaks possible. Cloud developing around 600m through the evening, mainly in the northwest of the park leading to poor visibilities over highest routes here later.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Overnight into Friday cloud is expected to move into the areas from the west, this may bring hill fog widely across the park as well as bands of patchy rain. Conditions are expected to remain widely cloudy throughout the morning with further outbreaks of rain. The rain slowly clears to the southeast during the afternoon with cloud lifting and breaking with some bright spells during the evening.
Chance of cloud-free hill tops
20% rising to 70% through the afternoon.
Maximum wind speed expected
North-westerly 10-15 mph.
Temperature
- At 800m Plus 4 Celsius rising to plus 6 Celsius.
- Valley Plus 10 Celsius rising to plus 14 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low patchy cloud with bases between 400-600m is expected to move across the park throughout the morning and into the afternoon. Cloud lifting during the afternoon, with only scraps remaining around the summits by the evening. Moderate or good visibilities generally but poor or very poor visibilities in low cloud/hill fog and rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sat 26 Sep
Drier and brighter Saturday with low risk of an isolated shower. Moderate to fresh winds.
Sun 27 Sep
Dry and bright initially with cloud arriving through the late morning and a band of heavy rain crossing through the middle of the day. Fresh to strong winds.
Mon 28 Sep
Mostly fine and dry with variable cloud cover. Light winds.
Mountain weather information
Sat 26 Sep
Drier and brighter Saturday with low risk of an isolated shower. Moderate to fresh winds.
Sun 27 Sep
Dry and bright initially with cloud arriving through the late morning and a band of heavy rain crossing through the middle of the day. Fresh to strong winds.
Mon 28 Sep
Mostly fine and dry with variable cloud cover. Light winds.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations