Mountain weather
Eryri / Snowdonia
Confidence
High confidence in the overall weather but precise shower detail and timing remains lower confidence.
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Wed 13 MaySunrise:Sunset:
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Thu 14 MaySunrise: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.
Severe Chill Effect
Heavy Persistent Rain
Strong Sunlight
Gales
Poor Visibility
Thunderstorms
Mountain weather forecast
Heavy blustery showers and feeling cold despite some brighter spells.
|
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 |
90%
|
90%
|
90%
|
90%
|
80%
|
80%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | W 37mph knots
W
37mph |
NW 35mph knots
NW
35mph |
NW 30mph knots
NW
30mph |
NW 30mph knots
NW
30mph |
NW 31mph knots
NW
31mph |
NW 32mph knots
NW
32mph |
|
600m
|
600m | W 26mph knots
W
26mph |
NW 25mph knots
NW
25mph |
NW 23mph knots
NW
23mph |
NW 22mph knots
NW
22mph |
NW 21mph knots
NW
21mph |
NW 19mph knots
NW
19mph |
|
300m
|
300m | W 18mph knots
W
18mph |
NW 18mph knots
NW
18mph |
NW 17mph knots
NW
17mph |
NW 16mph knots
NW
16mph |
NW 15mph knots
NW
15mph |
NW 13mph knots
NW
13mph |
|
Valley
|
Valley | W 18mph knots
W
18mph |
NW 18mph knots
NW
18mph |
NW 17mph knots
NW
17mph |
NW 16mph knots
NW
16mph |
NW 15mph knots
NW
15mph |
NW 13mph knots
NW
13mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 44mph | 42mph | 39mph | 39mph | 39mph | 40mph |
|
600m
|
600m | 32mph | 32mph | 31mph | 31mph | 28mph | 26mph |
|
300m
|
300m | 29mph | 29mph | 29mph | 27mph | 26mph | 24mph |
|
Valley
|
Valley | 29mph | 29mph | 29mph | 27mph | 27mph | 24mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C |
|
600m
|
600m | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
900m
|
1000m
|
1100m
|
1100m
|
1100m
|
1100m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | -8 degrees Celsius -8°C | -7 degrees Celsius -7°C | -5 degrees Celsius -5°C | -4 degrees Celsius -4°C | -5 degrees Celsius -5°C | -6 degrees Celsius -6°C |
|
600m
|
600m | -4 degrees Celsius -4°C | -3 degrees Celsius -3°C | -1 degrees Celsius -1°C | 0 degrees Celsius 0°C | -1 degrees Celsius -1°C | -2 degrees Celsius -2°C |
|
300m
|
300m | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C |
|
Valley
|
Valley | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C |
| Freezing Level | Freezing Level |
900m
|
1000m
|
1100m
|
1100m
|
1100m
|
1100m
|
Additional weather information
Meteorologist's view
Frequent and locally heavy showers will bring a very changeable day. Care needed if heading into the hills with temperatures feeling cold at height, gusty winds and a risk of thunder. UV levels also remaining high in any brighter spells.
Weather
A mixture of sunshine and blustery showers likely through the day with fresh north-westerly winds. Showers heavy at times, with a risk of hail and thunder, and a lower freezing level seeing rain turn to sleet over the highest tops through the day.
Chance of cloud-free hill tops
60%.
Low cloud and visibility
Cloud bases mostly around 600-800m throughout, enough to shield summits at times. Visibility will generally be very good, although falling rapidly within any heavy showers to become moderate to poor, and locally very poor in any cloud and sleet at height.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Scattered showers continuing on Thursday with heavy downpours at times, and perhaps hail. A small chance of thunderstorms during the afternoon and a few brighter spells. Feeling cold with brisk winds continuing.
Chance of cloud-free hill tops
70%.
Maximum wind speed expected
North-westerly 20-25 mph gusting 35-40 mph.
Temperature
- At 800m plus 2 Celsius becoming plus 4 Celsius
- Valley plus 3 Celsius becoming plus 11 Celsius
- Freezing level above summits.
Low cloud and visibility
Cloud bases remain around 600-800m at times, enough to shield summits. Visibility will generally be very good, although falling rapidly within any heavy showers to become moderate to poor.
Ground conditions
No recent ground conditions report available.
Mountain weather information
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.
Sun 17 May
Skies clouding over from the west on Sunday with showery outbreaks of rain. Rain likely clearing to the east later but remaining largely cloudy.
Mountain weather information
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.
Sun 17 May
Skies clouding over from the west on Sunday with showery outbreaks of rain. Rain likely clearing to the east later but remaining largely cloudy.
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.