Mountain weather
Eryri / Snowdonia
Confidence
High for generally settled conditions and lower than average temperatures over the next few days, but lowering from Sunday onwards as we see a shift to more unsettled conditions caused by low pressure starting to push in from the Atlantic.
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This eveningSunrise:Sunset:
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Thu 12 NovSunrise:Sunset:
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Fri 13 NovSunrise:Sunset:
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Further outlook
This evening forecast
Dry with clear spells to start. Patchy lower cloud and a few light showers move into northern areas during the night. Moderate northerly winds leading to significant wind chill on the tops.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Mountain weather forecast
Dry and sunny, with great visibility. Chilly in the valleys, cold on the tops.
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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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|---|---|---|---|---|---|---|---|---|---|
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Weather
(at 800m)
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Weather symbols |  |
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 |
 |
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Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
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Wind direction and speed
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Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
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|---|---|---|---|---|---|---|---|---|---|
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900m
|
900m | N 19mph knots
N
19mph |
N 26mph knots
N
26mph |
NE 23mph knots
NE
23mph |
NE 27mph knots
NE
27mph |
N 23mph knots
N
23mph |
N 24mph knots
N
24mph |
NE 22mph knots
NE
22mph |
NE 17mph knots
NE
17mph |
|
600m
|
600m | N 9mph knots
N
9mph |
N 13mph knots
N
13mph |
NE 14mph knots
NE
14mph |
NE 14mph knots
NE
14mph |
N 17mph knots
N
17mph |
N 16mph knots
N
16mph |
NE 10mph knots
NE
10mph |
NE 10mph knots
NE
10mph |
|
300m
|
300m | NW 5mph knots
NW
5mph |
N 7mph knots
N
7mph |
NE 8mph knots
NE
8mph |
N 7mph knots
N
7mph |
N 12mph knots
N
12mph |
N 10mph knots
N
10mph |
NE 5mph knots
NE
5mph |
E 5mph knots
E
5mph |
|
Valley
|
Valley | NW 5mph knots
NW
5mph |
N 7mph knots
N
7mph |
NE 8mph knots
NE
8mph |
N 7mph knots
N
7mph |
N 12mph knots
N
12mph |
N 10mph knots
N
10mph |
NE 5mph knots
NE
5mph |
E 5mph knots
E
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 23mph | 32mph | 28mph | 33mph | 30mph | 30mph | 28mph | 22mph |
|
600m
|
600m | 12mph | 18mph | 19mph | 20mph | 24mph | 22mph | 15mph | 13mph |
|
300m
|
300m | 10mph | 17mph | 17mph | 18mph | 22mph | 20mph | 13mph | 10mph |
|
Valley
|
Valley | 10mph | 18mph | 17mph | 17mph | 22mph | 19mph | 13mph | 11mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||||
|
600m
|
600m | ||||||||
|
300m
|
300m | ||||||||
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Valley
|
Valley | ||||||||
| Freezing Level | Freezing Level |
1000m
|
900m
|
800m
|
400m
|
600m
|
700m
|
700m
|
600m
|
Additional weather information
Meteorologist's view
Wind speeds could exceed the values in the data table by 5-10mph, especially on exposed, east-west orientated ridges such as Crib Goch making progress hazardous. These strong winds coupled with the cold Arctic air will lead to significant wind chill. Plenty of warm and windproof clothing should be packed despite the sunny conditions.
Weather
Variable amounts of cloud during the early hours, with a slim chance of a light shower over northern hills, possibly falling as snow or sleet on the higher tops. Turning dry and widely sunny by mid-morning.
Chance of cloud-free hill tops
80% during the early hours, increasing to near 100% by mid-morning.
Low cloud and visibility
Areas of low cloud with bases 700-900m during the early hours, mainly affecting northern hills, then cloud widely clearing by mid-morning. Visibility poor in any early hill fog but otherwise excellent.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A cold start, but otherwise dry with sunny spells through the morning. A band of cloud and light to moderate showers, falling as snow over high ground, crossing the area from west to east during the afternoon. Turning drier into the evening with some clear spells. Significant wind chill likely.
Chance of cloud-free hill tops
90% in the morning, lowering to 50% in the afternoon, then rising to 80% in the evening.
Maximum wind speed expected
15-20mph northerly winds to start, easing to 10-15 mph westerlies in the afternoon.
Temperature
- At 800m Minus 2C - minus 1C, rising plus 1C in the afternoon.
- Valley Generally plus 1C, but with pockets of minus 2C in sheltered spots and extreme values of minus 5C possible in southeastern areas. Warming up to plus 7 C during the day.
- Freezing level 500m initially but down to valley floors in places, rising to 800-900m in the afternoon.
Low cloud and visibility
Scraps of hill fog above 900m during the morning and evening. Cloud bases dropping to 700m in afternoon showers. Visibility excellent outside of cloud but poor in wintry showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sat 14 Nov
Cloudy and largely dry, though small risk of isolated shower in the west which may be wintry over the summits. Strong southerly winds. Freezing level roughly 800-900m.
Sun 15 Nov
Cloudy with spells of rain through the day. Strong southerly winds. Freezing level around highest summits.
Mon 16 Nov
Cloudy, with spells of rain to start and end the day. Strong southerlies. Freezing level above summits.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations