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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Sun 27 SepSunrise:Sunset:
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Mon 28 SepSunrise:Sunset:
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Further outlook
This evening forecast
Plenty of dry and bright weather with pleasant evening sunshine to end Saturday.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Heavy Persistent Snow
Poor Visibility
Heavy Persistent Rain
Strong Sunlight
Mountain weather forecast
Turning wet and windy through the morning but clearing later.
|
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 |
10%
|
10%
|
70%
|
90%
|
90%
|
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 | W 15mph knots
W
15mph |
SW 11mph knots
SW
11mph |
SW 10mph knots
SW
10mph |
S 9mph knots
S
9mph |
SW 8mph knots
SW
8mph |
S 6mph knots
S
6mph |
E 11mph knots
E
11mph |
E 18mph knots
E
18mph |
|
600m
|
600m | SW 8mph knots
SW
8mph |
SW 7mph knots
SW
7mph |
S 6mph knots
S
6mph |
S 6mph knots
S
6mph |
SW 7mph knots
SW
7mph |
S 5mph knots
S
5mph |
SE 7mph knots
SE
7mph |
E 11mph knots
E
11mph |
|
300m
|
300m | SW 4mph knots
SW
4mph |
SW 4mph knots
SW
4mph |
S 4mph knots
S
4mph |
S 4mph knots
S
4mph |
SW 6mph knots
SW
6mph |
S 4mph knots
S
4mph |
E 5mph knots
E
5mph |
E 7mph knots
E
7mph |
|
Valley
|
Valley | SW 4mph knots
SW
4mph |
S 4mph knots
S
4mph |
S 5mph knots
S
5mph |
S 5mph knots
S
5mph |
SW 5mph knots
SW
5mph |
SE 6mph knots
SE
6mph |
E 5mph knots
E
5mph |
SE 6mph knots
SE
6mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 19mph | 14mph | 13mph | 13mph | 13mph | 12mph | 16mph | 25mph |
|
600m
|
600m | 12mph | 9mph | 9mph | 10mph | 12mph | 11mph | 12mph | 18mph |
|
300m
|
300m | 10mph | 8mph | 9mph | 8mph | 12mph | 10mph | 8mph | 12mph |
|
Valley
|
Valley | 11mph | 9mph | 9mph | 9mph | 11mph | 11mph | 9mph | 10mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 3 degrees Celsius 3°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 12 degrees Celsius 12°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1500m
|
1400m
|
1400m
|
1400m
|
1500m
|
1600m
|
1700m
|
1700m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 0 degrees Celsius 0°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 3 degrees Celsius 3°C | 1 degrees Celsius 1°C |
|
600m
|
600m | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 3 degrees Celsius 3°C | 7 degrees Celsius 7°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 7 degrees Celsius 7°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 9 degrees Celsius 9°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 11 degrees Celsius 11°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
1500m
|
1400m
|
1400m
|
1400m
|
1500m
|
1600m
|
1700m
|
1700m
|
Additional weather information
Meteorologist's view
A rather challenging start to the day for outdoor activities in the national park. Patchy low cloud and persistent heavy rain will make for challenging navigation and for slippery conditions underfoot. Waterproof clothing is recommended. Through the afternoon conditions are expected to improve with drier and brighter skies. UV levels at this point will still be moderate so sun protection should be considered.
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. Becoming dry with sunny spells towards the evening.
Chance of cloud-free hill tops
40% becoming 20% becoming 90% from late afternoon.
Low cloud and visibility
Patches of cloud developing above 600m through the morning, becoming periods above 400-500m through the afternoon, especially in association with more prolonged periods of rain. Lifting to above the summits from late afternoon as rain and cloud clears east. Often poor in the rain and very poor in cloud/hill fog but good ahead of the rain in the morning and again late afternoon.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
High pressure will bring a mostly dry day with lengthy sunny periods, once any early isolated mist and valley fog has cleared. Light northwesterly winds becoming light to moderate easterly.
Chance of cloud-free hill tops
>95%
Maximum wind speed expected
Southerly 10-15 mph.
Temperature
- At 800m Plus 4 Celsius rising to plus 8 Celsius.
- Valley Plus 11 Celsius rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Initially there may be some isolated mist and valley fog in prone locations, this is expected to quickly clear. All cloud is expected to be above summits throughout the day. Poor or very poor visibility in mist or valley fog initially but once cleared no visibility issues are expected. Views of distant peaks possible.
Ground conditions
No recent ground conditions report available.
Mountain weather information
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.
Thu 1 Oct
Another rather breezy day ahead with bright or sunny spells as well as scattered showers.
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.