Mountain weather
Eryri / Snowdonia
Confidence
Very high for a generally dry Saturday. Moderate for extent and timing of early rain on Sunday, then mainly high for a changeable few days.
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This eveningSunrise:Sunset:
-
Sat 5 SepSunrise:Sunset:
-
Sun 6 SepSunrise:Sunset:
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Further outlook
This evening forecast
Perhaps a brief shower at first but mainly dry this evening.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Poor Visibility
Mountain weather forecast
Often fairly cloudy but occasional sunny intervals. Less windy than on Friday.
|
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%
|
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 | W 28mph knots
W
28mph |
W 25mph knots
W
25mph |
W 21mph knots
W
21mph |
W 16mph knots
W
16mph |
W 16mph knots
W
16mph |
SW 17mph knots
SW
17mph |
SW 17mph knots
SW
17mph |
S 18mph knots
S
18mph |
|
600m
|
600m | W 18mph knots
W
18mph |
W 15mph knots
W
15mph |
W 12mph knots
W
12mph |
W 12mph knots
W
12mph |
W 13mph knots
W
13mph |
SW 14mph knots
SW
14mph |
SW 12mph knots
SW
12mph |
S 12mph knots
S
12mph |
|
300m
|
300m | W 12mph knots
W
12mph |
W 10mph knots
W
10mph |
W 7mph knots
W
7mph |
W 9mph knots
W
9mph |
W 10mph knots
W
10mph |
SW 10mph knots
SW
10mph |
SW 8mph knots
SW
8mph |
S 6mph knots
S
6mph |
|
Valley
|
Valley | W 13mph knots
W
13mph |
W 10mph knots
W
10mph |
W 8mph knots
W
8mph |
W 10mph knots
W
10mph |
W 10mph knots
W
10mph |
SW 10mph knots
SW
10mph |
SW 7mph knots
SW
7mph |
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 | 36mph | 31mph | 26mph | 22mph | 22mph | 24mph | 23mph | 23mph |
|
600m
|
600m | 25mph | 22mph | 18mph | 18mph | 19mph | 21mph | 18mph | 16mph |
|
300m
|
300m | 23mph | 20mph | 16mph | 16mph | 17mph | 19mph | 16mph | 14mph |
|
Valley
|
Valley | 24mph | 21mph | 16mph | 16mph | 16mph | 17mph | 14mph | 13mph |
|
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 | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°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 | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
| Freezing Level | Freezing Level |
1900m
|
1900m
|
1900m
|
1800m
|
1900m
|
1800m
|
2300m
|
3700m
|
|
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 | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°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 | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
Valley
|
Valley | 11 degrees Celsius 11°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 | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
| Freezing Level | Freezing Level |
1900m
|
1900m
|
1900m
|
1800m
|
1900m
|
1800m
|
2300m
|
3700m
|
Additional weather information
Meteorologist's view
A fine day for hill walking but remember some extra layers if you are heading to the summits as it will feel chilly in the breeze.
Weather
The odd shower is possible through the early hours but by dawn it will be dry. Quite large amounts of cloud through the day but occasional sunny spells are likely. A small chance of showery light rain arriving by dusk.
Chance of cloud-free hill tops
70% becoming 90%
Low cloud and visibility
Patches of cloud above 700m during the morning, perhaps more extensive and prolonged across the Yr Wyddfa range until mid-morning. Lifting to patches above 850-900m by the afternoon. Poor or very poor visibility in the cloud but otherwise very good with excellent air clarity.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Showery rain is possible for a time through the early hours but this is likely to clear by mid-morning. Thereafter another fine day is expected with a mixture of cloud and sunny spells. A small chance of an afternoon/evening shower.
Chance of cloud-free hill tops
80% but 60% first thing and lowering to 40% through the evening.
Maximum wind speed expected
Southerly 25-35 mph with gusts of up to 40 mph. Isolated 50 mph gusts later.
Temperature
- At 800m Plus 9 Celsius rising to plus 17 Celsius.
- Valley Plus 12 Celsius rising to plus 24 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Many hills clear of cloud but occasional patches above 700-800m in association with morning rain. Cloud above 500-700m turning more persistent through the evening (low confidence). Poor or very poor visibility in the cloud and occasionally moderate at most levels in the rain. Otherwise often good, albeit somewhat hazier than on Saturday.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 7 Sep
Mainly dry through the morning with bright periods and hazy sunny spells. Showery rain possibly arriving through the afternoon. Periods of hill fog, especially in the west. Moderate to fresh westerly winds.
Tue 8 Sep
Overnight rain may linger into the morning before turning brighter with sunny spells and frequent blustery showers. Feeling cool in the fresh to strong westerly, then northwesterly winds.
Wed 9 Sep
Still breezy but not as windy with moderate northwesterly winds gradually easing. Rather cloudy but mainly dry with sunny spells.
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.