Mountain weather
Eryri / Snowdonia
Confidence
Generally high confidence.
-
This eveningSunrise:Sunset:
-
Mon 18 MaySunrise:Sunset:
-
Tue 19 MaySunrise:Sunset:
-
Further outlook
This evening forecast
Scattered showers continuing this evening with some heavy downpours at times and a small risk of a thunderstorms. Drier, clearer spells in between.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Heavy Persistent Rain
Thunderstorms
Strong Sunlight
Mountain weather forecast
Rain moving through overnight, followed by a drier day, before rain returns.
|
Time
|
Time |
00:00
|
03:00
|
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 |
80%
|
80%
|
80%
|
20%
|
20%
|
20%
|
80%
|
80%
|
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 21mph knots
SW
21mph |
SW 16mph knots
SW
16mph |
W 14mph knots
W
14mph |
SW 13mph knots
SW
13mph |
SW 14mph knots
SW
14mph |
SW 16mph knots
SW
16mph |
S 21mph knots
S
21mph |
S 27mph knots
S
27mph |
|
600m
|
600m | SW 14mph knots
SW
14mph |
SW 10mph knots
SW
10mph |
W 10mph knots
W
10mph |
SW 11mph knots
SW
11mph |
SW 12mph knots
SW
12mph |
SW 15mph knots
SW
15mph |
S 16mph knots
S
16mph |
S 19mph knots
S
19mph |
|
300m
|
300m | SW 7mph knots
SW
7mph |
SW 5mph knots
SW
5mph |
W 6mph knots
W
6mph |
SW 8mph knots
SW
8mph |
SW 9mph knots
SW
9mph |
S 11mph knots
S
11mph |
S 11mph knots
S
11mph |
S 12mph knots
S
12mph |
|
Valley
|
Valley | S 7mph knots
S
7mph |
SW 5mph knots
SW
5mph |
W 6mph knots
W
6mph |
W 7mph knots
W
7mph |
SW 8mph knots
SW
8mph |
S 10mph knots
S
10mph |
S 10mph knots
S
10mph |
S 12mph knots
S
12mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 25mph | 20mph | 17mph | 17mph | 19mph | 21mph | 27mph | 33mph |
|
600m
|
600m | 18mph | 13mph | 13mph | 15mph | 17mph | 21mph | 21mph | 25mph |
|
300m
|
300m | 15mph | 12mph | 11mph | 12mph | 15mph | 17mph | 18mph | 22mph |
|
Valley
|
Valley | 14mph | 12mph | 11mph | 12mph | 13mph | 16mph | 17mph | 21mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C |
|
300m
|
300m | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1200m
|
1300m
|
1100m
|
1100m
|
1200m
|
1200m
|
1600m
|
1800m
|
|
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 | -3 degrees Celsius -3°C | -3 degrees Celsius -3°C | -2 degrees Celsius -2°C | -1 degrees Celsius -1°C | 0 degrees Celsius 0°C | -1 degrees Celsius -1°C | -1 degrees Celsius -1°C |
|
600m
|
600m | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C |
|
300m
|
300m | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
1200m
|
1300m
|
1100m
|
1100m
|
1200m
|
1200m
|
1600m
|
1800m
|
Additional weather information
Meteorologist's view
Appropriate footwear for damp ground necessary due to recent rain. UV levels moderate during the day with sun protection advised.
Weather
A band of heavy, organised showers clearing eastwards during the early hours. Mostly dry thereafter with a low risk of a few showers into the afternoon. More persistent rain edging in by the evening and moving across the park into the night, heavy in the west. Winds increasing.
Chance of cloud-free hill tops
60% dropping to 40% by end of day.
Low cloud and visibility
Broken cloud around 400-500 m at first, lifting mostly above summits, then lowering further by the evening down to 400m and becoming more widespread across the park. Good visibility outside showers, dropping to very poor by the evening in more persistent rain.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rain clearing in the early hours followed by scattered heavy and blustery showers. Rather windy compared to recent days. Small risk of a thunderstorm.
Chance of cloud-free hill tops
40% at first, increasing to 60% during the day.
Maximum wind speed expected
Southwesterly 15-20mph gusting up to 40 mph at times.
Temperature
- At 800m Plus 6 Celsius rising to plus 9 Celsius.
- Valley Plus 8 Celsius rising to plus 16 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Around 400m at first, but lifting during the day. Cloud bases lowering in heavy showers to 400-500m.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 20 May
Further showers possible but detail uncertain. Temperatures rising. Strong southwesterly winds.
Thu 21 May
Early fog clearing then a fine day with plenty of sunshine. Warmer with moderate southerly winds.
Fri 22 May
A dry and rather warm day with strong sunshine, hazy at times. Wind easing.
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.