Mountain weather
Eryri / Snowdonia
Confidence
High for the changeable story throughout the next few days. Lower confidence on exact rainfall amounts Thursday night.
-
This eveningSunrise:Sunset:
-
Wed 9 SepSunrise:Sunset:
-
Thu 10 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Showers continuing into the evening and through much of the night with winds gradually easing.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Mountain weather forecast
Showers gradually fading with winds easing.
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Time
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Time |
00:00
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03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
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|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols |  |
|
|
 |
|
|
|
 |
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Chance of
precipitation (at 800m)
|
Chance of precipitation |
20%
|
20%
|
20%
|
30%
|
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 11mph knots
SW
11mph |
S 16mph knots
S
16mph |
S 20mph knots
S
20mph |
S 25mph knots
S
25mph |
S 29mph knots
S
29mph |
S 29mph knots
S
29mph |
S 25mph knots
S
25mph |
SW 21mph knots
SW
21mph |
|
600m
|
600m | S 8mph knots
S
8mph |
S 11mph knots
S
11mph |
S 14mph knots
S
14mph |
S 19mph knots
S
19mph |
S 23mph knots
S
23mph |
S 22mph knots
S
22mph |
S 19mph knots
S
19mph |
SW 15mph knots
SW
15mph |
|
300m
|
300m | S 4mph knots
S
4mph |
S 7mph knots
S
7mph |
S 10mph knots
S
10mph |
S 15mph knots
S
15mph |
S 18mph knots
S
18mph |
S 18mph knots
S
18mph |
S 16mph knots
S
16mph |
SW 13mph knots
SW
13mph |
|
Valley
|
Valley | S 5mph knots
S
5mph |
S 7mph knots
S
7mph |
S 10mph knots
S
10mph |
S 14mph knots
S
14mph |
S 16mph knots
S
16mph |
S 16mph knots
S
16mph |
S 15mph knots
S
15mph |
SW 12mph knots
SW
12mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 16mph | 21mph | 26mph | 34mph | 41mph | 43mph | 39mph | 32mph |
|
600m
|
600m | 11mph | 16mph | 20mph | 28mph | 34mph | 35mph | 32mph | 26mph |
|
300m
|
300m | 10mph | 14mph | 19mph | 26mph | 32mph | 33mph | 30mph | 23mph |
|
Valley
|
Valley | 11mph | 15mph | 19mph | 24mph | 29mph | 30mph | 28mph | 22mph |
|
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 |
1600m
|
1700m
|
2000m
|
2400m
|
3000m
|
3000m
|
3000m
|
2700m
|
Additional weather information
Meteorologist's view
A good day to be in the national park with plenty of dry and bright weather around. Moderate levels of UV are expected although some extra layers maybe required at height as it will be feeling rather cold in the wind.
Weather
Apart from the odd stray shower during the first part of Wednesday, it will be a largely dry and bright day. Still feeling on the cool side, but pleasant in any shelter and sunshine.
Chance of cloud-free hill tops
70% rising to >95% through the morning.
Low cloud and visibility
Cloud may briefly cover summits during the passage of any showers during the first half of the day, otherwise generally above the summits throughout the day. Visibilities generally very good, but falling to moderate in any showers and very poor in any hill fog.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A bright start but low cloud and outbreaks of rain will soon arrive from the west through the morning. This may turn heavy through the afternoon and into the evening. Moderate southwesterly winds.
Chance of cloud-free hill tops
90% dropping to 10% through the afternoon.
Maximum wind speed expected
Southwesterly 25-30 mph.
Temperature
- At 800m plus 5 Celsius rising to plus 8 Celsius.
- Valley plus 12 Celsius rising to plus 16 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases initially above summits but dropping to bases between 500-600m through the afternoon with patchy areas of cloud with bases between 300-400m. Visibilities initially very good but becoming poor or very poor in hill fog later and may widely dip to moderate or poor in persistent rain through the afternoon.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 11 Sep
A drier and brighter day with any early morning cloud quickly lifting and breaking, to leave Lengthy sunny spells by afternoon.
Sat 12 Sep
Dry and bright initially with some low cloud and rain arriving from the northwest later.
Sun 13 Sep
Some patchy cloud and the od shower possibly at first but this is expected to clear away leaving a dry and brighter afternoon with lengthy sunny spells.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations