Mountain weather
Eryri / Snowdonia
Confidence
Generally high but uncertainty remains in the shower extent and clearance on Friday and Saturday.
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This eveningSunrise:Sunset:
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Thu 20 AugSunrise:Sunset:
-
Fri 21 AugSunrise:Sunset:
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Further outlook
This evening forecast
A mix of clear spells and showers this evening, with the odd heavy and thundery shower possible.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Thunderstorms
Heavy Persistent Rain
Strong Sunlight
Mountain weather forecast
Sunshine and showers.
|
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 |
70%
|
70%
|
70%
|
70%
|
70%
|
70%
|
70%
|
40%
|
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 17mph knots
W
17mph |
W 14mph knots
W
14mph |
W 12mph knots
W
12mph |
NW 13mph knots
NW
13mph |
N 18mph knots
N
18mph |
N 20mph knots
N
20mph |
N 19mph knots
N
19mph |
NW 16mph knots
NW
16mph |
|
600m
|
600m | W 10mph knots
W
10mph |
W 9mph knots
W
9mph |
W 7mph knots
W
7mph |
NW 9mph knots
NW
9mph |
N 15mph knots
N
15mph |
N 16mph knots
N
16mph |
N 14mph knots
N
14mph |
NW 8mph knots
NW
8mph |
|
300m
|
300m | W 6mph knots
W
6mph |
SW 5mph knots
SW
5mph |
NW 4mph knots
NW
4mph |
NW 7mph knots
NW
7mph |
N 11mph knots
N
11mph |
N 12mph knots
N
12mph |
N 10mph knots
N
10mph |
NW 6mph knots
NW
6mph |
|
Valley
|
Valley | W 6mph knots
W
6mph |
SW 5mph knots
SW
5mph |
NW 5mph knots
NW
5mph |
NW 7mph knots
NW
7mph |
N 11mph knots
N
11mph |
N 12mph knots
N
12mph |
N 10mph knots
N
10mph |
NW 6mph knots
NW
6mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 20mph | 17mph | 14mph | 17mph | 24mph | 27mph | 25mph | 21mph |
|
600m
|
600m | 14mph | 12mph | 10mph | 13mph | 20mph | 23mph | 20mph | 13mph |
|
300m
|
300m | 12mph | 11mph | 8mph | 11mph | 18mph | 21mph | 18mph | 12mph |
|
Valley
|
Valley | 12mph | 11mph | 9mph | 11mph | 19mph | 21mph | 17mph | 12mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 9 degrees Celsius 9°C | 8 degrees Celsius 8°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 | 7 degrees Celsius 7°C |
|
600m
|
600m | 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 | 9 degrees Celsius 9°C |
|
300m
|
300m | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C |
| Freezing Level | Freezing Level |
2300m
|
2200m
|
2200m
|
2200m
|
2200m
|
2000m
|
2000m
|
1900m
|
|
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 | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C |
|
600m
|
600m | 8 degrees Celsius 8°C | 8 degrees Celsius 8°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 | 7 degrees Celsius 7°C |
|
300m
|
300m | 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 | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
|
Valley
|
Valley | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
| Freezing Level | Freezing Level |
2300m
|
2200m
|
2200m
|
2200m
|
2200m
|
2000m
|
2000m
|
1900m
|
Additional weather information
Meteorologist's view
Following a prolonged dry spell, heavy showers may lead to rapid surface run-off on steep slopes. This could create slippery underfoot conditions and increase hazards for hikers, particularly on exposed paths and uneven terrain.
Weather
An unsettled day with very changeable conditions. Heavy showers are likely with the chance of thunderstorms with hail as well as gusty winds during heavy downpours. Brief drier interludes and glimpses of sunshine can also be expected in between showers.
Chance of cloud-free hill tops
40% rising to over 80%
Low cloud and visibility
Patches of low cloud around 600-700m lifting by mid-morning. Generally good visibility of distant hills outside any heavy showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Perhaps a drier start with the odd shower in places though showers will become more frequent and widespread through the day. Showers may turn heavy and thundery with hail possible, but will eventually ease again later into the day.
Chance of cloud-free hill tops
80%
Maximum wind speed expected
20mph
Temperature
- At 800m Plus 9 Celsius rising to plus 16 Celsius.
- Valley Plus 6 Celsius rising to plus 18 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases may shroud peaks during heavy downpours, otherwise most cloud above the tops of hills. Visibility will also drop to poor in heavy showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sat 22 Aug
The odd shower still possible, but far fewer than Friday. Otherwise mostly dry with sunny spells. Light to moderate northerly winds.
Sun 23 Aug
Mostly dry with sunny spells and a light northerly breeze. Feeling a bit warmer.
Mon 24 Aug
Similar to Sunday though winds turning easterly.
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.