Mountain weather
Eryri / Snowdonia
Confidence
High for the changeable theme, driest on Friday then wet again on Saturday. Lower for timing of rain and low cloud.
-
This eveningSunrise:Sunset:
-
Fri 11 SepSunrise:Sunset:
-
Sat 12 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Cloudy with rain, clearing to showers.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Mountain weather forecast
Low cloud and fog clearing to sunny intervals. Odd shower first thing.
|
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 |
30%
|
30%
|
30%
|
10%
|
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 | S 23mph knots
S
23mph |
SW 33mph knots
SW
33mph |
SW 38mph knots
SW
38mph |
SW 40mph knots
SW
40mph |
SW 38mph knots
SW
38mph |
SW 33mph knots
SW
33mph |
SW 27mph knots
SW
27mph |
SW 22mph knots
SW
22mph |
|
600m
|
600m | S 16mph knots
S
16mph |
S 23mph knots
S
23mph |
SW 27mph knots
SW
27mph |
SW 27mph knots
SW
27mph |
SW 25mph knots
SW
25mph |
SW 23mph knots
SW
23mph |
SW 19mph knots
SW
19mph |
SW 16mph knots
SW
16mph |
|
300m
|
300m | S 9mph knots
S
9mph |
S 16mph knots
S
16mph |
S 20mph knots
S
20mph |
SW 21mph knots
SW
21mph |
SW 20mph knots
SW
20mph |
SW 18mph knots
SW
18mph |
SW 16mph knots
SW
16mph |
SW 13mph knots
SW
13mph |
|
Valley
|
Valley | S 9mph knots
S
9mph |
S 14mph knots
S
14mph |
S 19mph knots
S
19mph |
SW 20mph knots
SW
20mph |
SW 19mph knots
SW
19mph |
SW 17mph knots
SW
17mph |
SW 14mph knots
SW
14mph |
SW 10mph knots
SW
10mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 29mph | 42mph | 50mph | 53mph | 52mph | 47mph | 40mph | 32mph |
|
600m
|
600m | 21mph | 32mph | 39mph | 41mph | 39mph | 37mph | 32mph | 26mph |
|
300m
|
300m | 18mph | 29mph | 35mph | 36mph | 36mph | 33mph | 28mph | 22mph |
|
Valley
|
Valley | 18mph | 26mph | 34mph | 36mph | 35mph | 31mph | 25mph | 19mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
|
600m
|
600m | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C |
|
Valley
|
Valley | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C |
| Freezing Level | Freezing Level |
2800m
|
3700m
|
3600m
|
3700m
|
3400m
|
3000m
|
2900m
|
2800m
|
|
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 | 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 | 7 degrees Celsius 7°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2800m
|
3700m
|
3600m
|
3700m
|
3400m
|
3000m
|
2900m
|
2800m
|
Additional weather information
Meteorologist's view
UV levels still moderate in the sunshine later in the day, otherwise good day on the hills after early low cloud.
Weather
Cloudy to start with patchy rain and drizzle clearing eastwards. Rain clearing by dawn with sunnier spells developing through late morning. Cloud melting away during the evening to leave clear skies and a few mist patches.
Chance of cloud-free hill tops
40% rising to 90% by late morning.
Low cloud and visibility
From dawn and through the early morning some patchy low cloud with bases around 500 m, lifting by late morning. Generally, very good or excellent visibilities, with views of distant peaks possible. However, visibilities may drop to moderate or poor in any patchy cloud initially.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Cloudy during the early hours, then a band of heavy and persistent rain moving across the park from early morning and into the afternoon, turning patchier and lighter by the evening.
Chance of cloud-free hill tops
20%
Maximum wind speed expected
Southwesterly30-35 mph gusting 40 mph.
Temperature
- At 800m Plus 6 Celsius rising to plus 9 Celsius.
- Valley Plus 15 Celsius rising to plus 18 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Widespread low cloud with bases down to 200 m, especially across southwestern facing hills. Very poor visibility in low cloud and heavy rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sun 13 Sep
Early mist and low cloud lifting to give way to sunnier spells. Mostly dry with light winds.
Mon 14 Sep
Cloudy with outbreaks of rain and drizzle. Moderate southwesterly winds.
Tue 15 Sep
Early rain clearing to sunnier intervals. Moderate westerly winds.
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.