Mountain weather
Eryri / Snowdonia
Confidence
High confidence for a changeable theme. Lower for the clearance of low cloud and rain tomorrow morning and arrival tomorrow night.
-
This eveningSunrise:Sunset:
-
Tue 29 SepSunrise:Sunset:
-
Wed 30 SepSunrise: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.
Gales
Poor Visibility
Heavy Persistent Rain
Mountain weather forecast
Damp and dull start. Brighter by the afternoon, with heavy rain arriving later. Windy.
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Time
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Time |
00:00
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03:00
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06:00
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09:00
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12:00
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15:00
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18:00
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21:00
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|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
20%
|
60%
|
80%
|
60%
|
30%
|
30%
|
70%
|
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 47mph knots
S
47mph |
S 37mph knots
S
37mph |
S 29mph knots
S
29mph |
S 32mph knots
S
32mph |
S 31mph knots
S
31mph |
S 29mph knots
S
29mph |
S 27mph knots
S
27mph |
S 25mph knots
S
25mph |
|
600m
|
600m | S 30mph knots
S
30mph |
S 23mph knots
S
23mph |
S 19mph knots
S
19mph |
S 21mph knots
S
21mph |
S 24mph knots
S
24mph |
S 22mph knots
S
22mph |
S 18mph knots
S
18mph |
S 17mph knots
S
17mph |
|
300m
|
300m | SE 20mph knots
SE
20mph |
S 15mph knots
S
15mph |
S 13mph knots
S
13mph |
S 16mph knots
S
16mph |
S 19mph knots
S
19mph |
S 19mph knots
S
19mph |
S 15mph knots
S
15mph |
S 13mph knots
S
13mph |
|
Valley
|
Valley | SE 19mph knots
SE
19mph |
S 14mph knots
S
14mph |
S 11mph knots
S
11mph |
S 14mph knots
S
14mph |
S 18mph knots
S
18mph |
S 17mph knots
S
17mph |
S 13mph knots
S
13mph |
S 10mph knots
S
10mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 58mph | 47mph | 37mph | 42mph | 44mph | 43mph | 38mph | 35mph |
|
600m
|
600m | 41mph | 32mph | 28mph | 31mph | 36mph | 35mph | 29mph | 26mph |
|
300m
|
300m | 36mph | 28mph | 24mph | 28mph | 34mph | 33mph | 26mph | 22mph |
|
Valley
|
Valley | 35mph | 27mph | 21mph | 26mph | 32mph | 30mph | 23mph | 18mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C |
|
600m
|
600m | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 17 degrees Celsius 17°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
|
Valley
|
Valley | 19 degrees Celsius 19°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
| Freezing Level | Freezing Level |
3500m
|
3400m
|
2900m
|
2100m
|
2000m
|
2100m
|
2000m
|
1900m
|
|
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 | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
| Freezing Level | Freezing Level |
3500m
|
3400m
|
2900m
|
2100m
|
2000m
|
2100m
|
2000m
|
1900m
|
Additional weather information
Meteorologist's view
Good navigational skills required first thing in low cloud and poor visibilities. Conditions improving later with moderate UV levels however winds strengthening with buffeting likely near summits.
Weather
Low cloud spreading in overnight bringing a risk of hill fog and drizzly rain through the morning. This is expected to lift and break into the afternoon with a band of heavy and persistent rain arriving from the west later. Turning unsettled and windy with strong southeasterly winds developing and a chance of summit gales.
Chance of cloud-free hill tops
10% rising to over 60% by late afternoon.
Low cloud and visibility
Cloud bases initially above 300-400m rising to 500-600m by afternoon, before gradually rising above summits. Moderate or good visibilities generally but poor or very poor in hill fog. Visibilities also expected to drop to poor in any outbreaks of light rain or drizzle.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Very wet and windy overnight with a band of heavy rain clearing most of the park by dawn. Thereafter a breezy day with sunny spells and showers.
Chance of cloud-free hill tops
20% overnight, soon lifting to over 80% by mid-morning.
Maximum wind speed expected
Southwesterly 20-25 mph gusting 30-35 mph.
Temperature
- At 800m Plus 7 Celsius rising to plus 10 Celsius.
- Valley Plus 15 Celsius rising to plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low cloud down to 400-500 m first thing, otherwise rising mostly at or above summits by mid-morning. Poor visibility during the morning then very good.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 1 Oct
Another rather breezy day ahead with bright or sunny spells as well as scattered showers.
Fri 2 Oct
Showery outbreaks of rain and stronger winds on Friday.
Sat 3 Oct
More settled on Saturday with high pressure. Still the risk of the odd shower but light and variable 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.