Mountain weather
Eryri / Snowdonia
Confidence
High for a fine day on Sunday. Moderate for details of low cloud and rain/drizzle on Monday.
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This eveningSunrise:Sunset:
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Sun 20 SepSunrise:Sunset:
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Mon 21 SepSunrise:Sunset:
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Further outlook
This evening forecast
Rain clearing then dry overnight.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Mountain weather forecast
Dry and mostly bright with periods of sunshine, hazy at times. Winds easing.
|
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%
|
10%
|
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 | SW 17mph knots
SW
17mph |
SW 20mph knots
SW
20mph |
SW 20mph knots
SW
20mph |
SW 20mph knots
SW
20mph |
SW 17mph knots
SW
17mph |
SW 13mph knots
SW
13mph |
SW 12mph knots
SW
12mph |
SW 13mph knots
SW
13mph |
|
600m
|
600m | S 12mph knots
S
12mph |
S 15mph knots
S
15mph |
S 14mph knots
S
14mph |
SW 13mph knots
SW
13mph |
SW 12mph knots
SW
12mph |
SW 11mph knots
SW
11mph |
SW 8mph knots
SW
8mph |
SW 8mph knots
SW
8mph |
|
300m
|
300m | S 7mph knots
S
7mph |
S 10mph knots
S
10mph |
S 10mph knots
S
10mph |
SW 10mph knots
SW
10mph |
SW 10mph knots
SW
10mph |
SW 9mph knots
SW
9mph |
SW 7mph knots
SW
7mph |
SW 7mph knots
SW
7mph |
|
Valley
|
Valley | S 7mph knots
S
7mph |
S 10mph knots
S
10mph |
S 9mph knots
S
9mph |
SW 9mph knots
SW
9mph |
SW 9mph knots
SW
9mph |
SW 9mph knots
SW
9mph |
SW 6mph knots
SW
6mph |
S 6mph knots
S
6mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 20mph | 24mph | 26mph | 26mph | 24mph | 21mph | 18mph | 18mph |
|
600m
|
600m | 16mph | 20mph | 20mph | 20mph | 20mph | 18mph | 14mph | 13mph |
|
300m
|
300m | 14mph | 18mph | 17mph | 17mph | 17mph | 16mph | 12mph | 11mph |
|
Valley
|
Valley | 15mph | 18mph | 17mph | 16mph | 16mph | 15mph | 10mph | 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 | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
600m
|
600m | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
3400m
|
3700m
|
3500m
|
3400m
|
3200m
|
3000m
|
2900m
|
2900m
|
|
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 | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C | 14 degrees Celsius 14°C |
| Freezing Level | Freezing Level |
3400m
|
3700m
|
3500m
|
3400m
|
3200m
|
3000m
|
2900m
|
2900m
|
Additional weather information
Meteorologist's view
A nice day for hill walking once any cloud clears the summits.
Weather
A generally dry day with periods of sunshine. High level cloud may turn the sunshine watery at times but prolonged periods of sunshine can also be expected.
Chance of cloud-free hill tops
80%
Low cloud and visibility
Scraps of cloud may affect slopes above 700-800m through the morning before lifting and clearing by midday. Poor/very poor visibility in cloud but otherwise very good visibility with excellent air clarity.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A mainly dry day is expected but cloud will come and go and may be sufficiently thick enough to give some drizzly rain at times. Bright or sunny spells are also likely, more especially in the east.
Chance of cloud-free hill tops
20% west, 40% east.
Maximum wind speed expected
Westerly 15-20 mph, easing.
Temperature
- At 800m Plus 8 Celsius rising to plus 14 Celsius.
- Valley Plus 9 Celsius rising to plus 21 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Periods of cloud above 200-400m, most extensive and persistent in the west. The cloud may clear eastern hills for prolonged periods during the afternoon. Poor/very poor visibility in cloud but otherwise good visibility, albeit a little hazy.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Tue 22 Sep
Early valley fog lifting and clearing. Thereafter a dry day with broken cloud and sunny spells. Moderate to fresh southerly winds.
Wed 23 Sep
Turning windier and fresher. Often dry with occasional sunny spells but a greater chance of showers, perhaps heavy, most likely through the morning.
Thu 24 Sep
A dry day is most likely with occasional bright spells. Moderate 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.