Mountain weather
Eryri / Snowdonia
Confidence
Generally high but moderate for details of rain on Sunday and moderate for strength of winds on Tuesday.
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This eveningSunrise:Sunset:
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Sat 26 SepSunrise:Sunset:
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Sun 27 SepSunrise:Sunset:
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Further outlook
This evening forecast
A damp start, drier later this evening.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Severe Chill Effect
Mountain weather forecast
Largely dry with sunny spells, but the odd light shower is possible.
|
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%
|
10%
|
20%
|
20%
|
40%
|
30%
|
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 | S 26mph knots
S
26mph |
S 26mph knots
S
26mph |
SE 28mph knots
SE
28mph |
S 29mph knots
S
29mph |
S 32mph knots
S
32mph |
SW 27mph knots
SW
27mph |
W 16mph knots
W
16mph |
W 13mph knots
W
13mph |
|
600m
|
600m | S 18mph knots
S
18mph |
S 18mph knots
S
18mph |
S 18mph knots
S
18mph |
S 19mph knots
S
19mph |
S 23mph knots
S
23mph |
SW 19mph knots
SW
19mph |
W 10mph knots
W
10mph |
W 8mph knots
W
8mph |
|
300m
|
300m | S 12mph knots
S
12mph |
S 12mph knots
S
12mph |
S 14mph knots
S
14mph |
S 15mph knots
S
15mph |
S 18mph knots
S
18mph |
SW 16mph knots
SW
16mph |
W 8mph knots
W
8mph |
W 6mph knots
W
6mph |
|
Valley
|
Valley | S 11mph knots
S
11mph |
S 11mph knots
S
11mph |
S 13mph knots
S
13mph |
S 14mph knots
S
14mph |
S 17mph knots
S
17mph |
SW 15mph knots
SW
15mph |
W 8mph knots
W
8mph |
W 6mph knots
W
6mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 32mph | 32mph | 36mph | 39mph | 44mph | 39mph | 22mph | 17mph |
|
600m
|
600m | 25mph | 25mph | 27mph | 29mph | 34mph | 31mph | 17mph | 12mph |
|
300m
|
300m | 22mph | 22mph | 24mph | 26mph | 31mph | 28mph | 13mph | 10mph |
|
Valley
|
Valley | 22mph | 21mph | 24mph | 24mph | 31mph | 26mph | 13mph | 10mph |
|
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 | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 7 degrees Celsius 7°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
300m
|
300m | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
|
Valley
|
Valley | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
2000m
|
1900m
|
2100m
|
2500m
|
2700m
|
2500m
|
1900m
|
1700m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 2 degrees Celsius 2°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 5 degrees Celsius 5°C |
|
300m
|
300m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°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 |
| Freezing Level | Freezing Level |
2000m
|
1900m
|
2100m
|
2500m
|
2700m
|
2500m
|
1900m
|
1700m
|
Additional weather information
Meteorologist's view
Turning into a lovely day for hill walking with nice views of distant hills. Summits may be shrouded in cloud for a time through the morning though. Given a brisk wind, temperatures will feel around freezing on the exposed summits - so remember some extra layers.
Weather
Any valley mist and fog patches will clear through the morning to leave a mainly dry day with sunny intervals and cloudier periods. There's a chance of a few showers too, but these will be brief and mostly light if they occur at all. Feeling pleasantly warm in any sunshine.
Chance of cloud-free hill tops
80%, but 50% Yr Wyddfa range until mid-morning.
Low cloud and visibility
Patches of cloud above 700-800m through the morning, possibly more widespread in the west of the park until mid-morning. Lifting to occasional patches above 900m by the afternoon with most summits clearing for lengthy periods. Generally very good visibility but locally poor or very poor in cloud/hill fog. Briefly moderate in any rain showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Dry through the early hours though turning windier with a chance of hill fog. Becoming increasingly wet through Sunday morning with the heaviest rain probably through the middle of the day and into the afternoon. Perhaps a little drier by the evening.
Chance of cloud-free hill tops
60% becoming 20%, increasing to 70% later
Maximum wind speed expected
Southeasterly 30-40 mph gusting 50 mph increasing to 45 mph gusting 60 mph for a time, easing and veering westerly 25 mph gusting 40 mph later.
Temperature
- At 800m Plus 7 Celsius rising to plus 11 Celsius.
- Valley Plus 6 Celsius rising to plus 20 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Patches of cloud developing above 500-700m through the morning becoming periods above 400-500m through the afternoon, especially in association with more prolonged periods of rain. Lifting to periods above 700-900m during the evening. Often poor in the rain and very poor in cloud/hill fog but good ahead of the rain in the morning.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 28 Sep
High pressure will bring a mostly dry day with lengthy sunny periods, once any early mist and hill fog has cleared. Light northwesterly winds becoming light to moderate easterly.
Tue 29 Sep
Turning unsettled and windy with strong southeasterly winds developing and a chance of summit gales later. Hill fog and occasional showery rain with potentially heavier rain later.
Wed 30 Sep
Overnight rain clearing around dawn to leave a bright and breezy day with sunny spells and a few showers. Fresh to strong southerly 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.