Mountain weather
Eryri / Snowdonia
Confidence
High for the general story with a strong southwesterly airstream on Friday then for drier and brighter day on Saturday. Confidence becomes low for details from Monday.
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This eveningSunrise:Sunset:
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Fri 2 OctSunrise:Sunset:
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Sat 3 OctSunrise:Sunset:
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Further outlook
This evening forecast
Clear spells and showers, some heavy late in the evening. Some patchy low cloud developing on the tops. Strong southwest winds with gales developing on high summits and ridges.
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
Cloudy with outbreaks of rain. Windy with gales on high slopes and ridges.
|
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 |
30%
|
30%
|
60%
|
60%
|
40%
|
40%
|
80%
|
80%
|
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 37mph knots
S
37mph |
SW 37mph knots
SW
37mph |
SW 36mph knots
SW
36mph |
SW 39mph knots
SW
39mph |
SW 42mph knots
SW
42mph |
SW 44mph knots
SW
44mph |
SW 42mph knots
SW
42mph |
SW 38mph knots
SW
38mph |
|
600m
|
600m | S 24mph knots
S
24mph |
S 25mph knots
S
25mph |
S 26mph knots
S
26mph |
S 28mph knots
S
28mph |
S 30mph knots
S
30mph |
SW 32mph knots
SW
32mph |
SW 30mph knots
SW
30mph |
SW 26mph knots
SW
26mph |
|
300m
|
300m | S 16mph knots
S
16mph |
S 16mph knots
S
16mph |
S 15mph knots
S
15mph |
S 18mph knots
S
18mph |
S 20mph knots
S
20mph |
SW 21mph knots
SW
21mph |
SW 19mph knots
SW
19mph |
SW 16mph knots
SW
16mph |
|
Valley
|
Valley | S 15mph knots
S
15mph |
S 16mph knots
S
16mph |
S 15mph knots
S
15mph |
S 18mph knots
S
18mph |
S 19mph knots
S
19mph |
S 20mph knots
S
20mph |
SW 18mph knots
SW
18mph |
SW 15mph knots
SW
15mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 44mph | 45mph | 44mph | 49mph | 53mph | 56mph | 53mph | 48mph |
|
600m
|
600m | 32mph | 33mph | 34mph | 37mph | 41mph | 43mph | 40mph | 36mph |
|
300m
|
300m | 29mph | 28mph | 28mph | 32mph | 36mph | 37mph | 35mph | 31mph |
|
Valley
|
Valley | 28mph | 28mph | 28mph | 32mph | 34mph | 36mph | 33mph | 29mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
300m
|
300m | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2300m
|
2400m
|
2500m
|
2600m
|
2600m
|
2500m
|
2700m
|
2700m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C |
| Freezing Level | Freezing Level |
2300m
|
2400m
|
2500m
|
2600m
|
2600m
|
2500m
|
2700m
|
2700m
|
Additional weather information
Meteorologist's view
A very windy day with gusts of 50 to 60mph on the high ridges and summits. This brings a high risk of being blown off balance so careful route choice will be required.
Weather
A few showers and patchy low cloud overnight. A largely cloudy day with outbreaks of rain, briefly heavy at times but drier spell is possible from late morning to early afternoon. A longer spell of heavy rain will develop during the evening. Strong and gusty winds.
Chance of cloud-free hill tops
Mainly 60%, but 30% early morning, then again in the evening.
Low cloud and visibility
Mainly good visibility during the day, briefly falling to a few kilometres in rain. Some early cloud and fog affecting slopes above about 500m, this lifting to around 900m through the morning before lowering in the evening.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Outbreaks of rain or drizzle overnight, heavy at times, clearing by dawn. A dry and settled day with long sunny spells. Feeling warm on low slopes.
Chance of cloud-free hill tops
40% overnight, becoming 90% by dawn.
Maximum wind speed expected
West or Southwest 30mph gusts 45mph overnight, easing to 10-15mph by dawn.
Temperature
- At 800m Plus 6C rising to 13C.
- Valley Plus 11C rising to 18C.
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud, bases 400 to 600m overnight, this slowly lifting and breaking up by the morning to leave good visibility from all hills.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sun 4 Oct
Extensive low cloud with occasional rain or drizzle. Strong southwest winds on the tops. Feeling warm and humid on low slopes.
Mon 5 Oct
Similar to Sunday with patchy rain and some low cloud, perhaps brightening up later. Breezy.
Tue 6 Oct
Likely to be unsettled with showers or longer spells of rain. Low confidence.
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.