Mountain weather
Eryri / Snowdonia
Confidence
High confidence overall, however lower confidence in the location and detail of showers, particularly later in the period.
-
This eveningSunrise:Sunset:
-
Tue 12 MaySunrise:Sunset:
-
Wed 13 MaySunrise:Sunset:
-
Further outlook
This evening forecast
Dry with clearing skies, feeling cold with a frost in places.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Severe Chill Effect
Thunderstorms
Mountain weather forecast
Turning cloudy, perhaps with some light rain or sleet during the morning.
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
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|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
10%
|
20%
|
30%
|
40%
|
20%
|
20%
|
20%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | NW 11mph knots
NW
11mph |
W 17mph knots
W
17mph |
W 22mph knots
W
22mph |
W 23mph knots
W
23mph |
NW 27mph knots
NW
27mph |
NW 26mph knots
NW
26mph |
W 23mph knots
W
23mph |
W 28mph knots
W
28mph |
|
600m
|
600m | SW 6mph knots
SW
6mph |
SW 11mph knots
SW
11mph |
SW 12mph knots
SW
12mph |
W 18mph knots
W
18mph |
NW 21mph knots
NW
21mph |
NW 20mph knots
NW
20mph |
W 17mph knots
W
17mph |
W 16mph knots
W
16mph |
|
300m
|
300m | SW 3mph knots
SW
3mph |
SW 3mph knots
SW
3mph |
W 7mph knots
W
7mph |
W 13mph knots
W
13mph |
NW 17mph knots
NW
17mph |
NW 16mph knots
NW
16mph |
W 12mph knots
W
12mph |
W 9mph knots
W
9mph |
|
Valley
|
Valley | SW 3mph knots
SW
3mph |
SW 4mph knots
SW
4mph |
W 7mph knots
W
7mph |
W 14mph knots
W
14mph |
NW 17mph knots
NW
17mph |
NW 16mph knots
NW
16mph |
W 12mph knots
W
12mph |
W 9mph knots
W
9mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 14mph | 20mph | 26mph | 30mph | 36mph | 34mph | 31mph | 34mph |
|
600m
|
600m | 7mph | 14mph | 16mph | 24mph | 29mph | 28mph | 24mph | 22mph |
|
300m
|
300m | 4mph | 10mph | 15mph | 22mph | 27mph | 26mph | 20mph | 20mph |
|
Valley
|
Valley | 5mph | 10mph | 15mph | 22mph | 27mph | 26mph | 20mph | 19mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C |
|
600m
|
600m | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 9 degrees Celsius 9°C |
| Freezing Level | Freezing Level |
900m
|
1000m
|
1200m
|
1300m
|
1200m
|
1100m
|
1100m
|
1100m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | -4 degrees Celsius -4°C | -5 degrees Celsius -5°C | -4 degrees Celsius -4°C | -4 degrees Celsius -4°C | -3 degrees Celsius -3°C | -2 degrees Celsius -2°C | -1 degrees Celsius -1°C | -3 degrees Celsius -3°C |
|
600m
|
600m | 0 degrees Celsius 0°C | -1 degrees Celsius -1°C | 0 degrees Celsius 0°C | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 1 degrees Celsius 1°C |
|
300m
|
300m | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 5 degrees Celsius 5°C |
|
Valley
|
Valley | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 7 degrees Celsius 7°C |
| Freezing Level | Freezing Level |
900m
|
1000m
|
1200m
|
1300m
|
1200m
|
1100m
|
1100m
|
1100m
|
Additional weather information
Meteorologist's view
Poor conditions during the morning with a mixture of low cloud, light rain and perhaps sleet will make navigation challenging. Conditions will improve, but it will remain surprising chilly for the time of year, however UV levels will remain moderate to high throughout, so sun protection is advised.
Weather
Turning increasingly cloudy from the north during the early hours with outbreaks of rain, and perhaps falling as sleet across the highest summits for a time during the morning. Turning drier and brighter into the afternoon with sunny spells developing across the park. Risk of a passing shower into the evening.
Chance of cloud-free hill tops
70% reducing to 50% for a time during the morning.
Low cloud and visibility
Cloud bases around 500 meters during the morning obscuring summits, however the cloud will lift and break from late morning with cloud bases lifting above the level of summits. Visibility generally high, however poor to moderate at times during morning and in any passing showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Turn increasingly cloudy overnight with frequent showers spreading across the park, these locally heavy and carrying a risk of hail and thunder. Becoming increasingly blustery and feeling cold.
Chance of cloud-free hill tops
70% throughout.
Maximum wind speed expected
Northwesterly means of 20-25 mph, gusting to 35-40 mph
Temperature
- At 800m Plus 1 Celsius rising to plus 7 Celsius.
- Valley Plus 2 Celsius rising to plus 12 Celsius.
- Freezing level Above level of summits.
Low cloud and visibility
Cloud bases mostly above the level of summits throughout, however levels likely to drop with temporary deteriorations as cloud bases drop low enough to shield summits for a time. Visibility generally high, however reducing to moderate in any rain or drizzle.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 14 May
Changeable with a mixture of sunny spells and blustery showers, these locally heavy and perhaps thundery. Feeling cold for mid-May. Still rather breezy but with lighter winds than Wednesday.
Fri 15 May
A chilly start, but mostly fine and dry, turning cloudier into the afternoon. Light winds, but still widely cool.
Sat 16 May
A dry and bright start likely, but clouding over from the west with rain and drizzle during the afternoon. Feeling less cold than recent days as temperatures start to recover.
Summit specific forecast
The Eryri (Snowdonia) mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Yr Wyddfa (Snowdon), standing at 1,085 metres.