Mountain weather
Eryri / Snowdonia
Confidence
High overall, but details of extent of rain later on in the week remain low.
-
This eveningSunrise:Sunset:
-
Mon 31 AugSunrise:Sunset:
-
Tue 1 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Heavy showers will continue across the park, some with hail and the risk of thunder.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Thunderstorms
Strong Sunlight
Poor Visibility
Mountain weather forecast
Showers gradually easing as the day progresses.
|
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 |
80%
|
80%
|
70%
|
60%
|
40%
|
40%
|
40%
|
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 | SW 16mph knots
SW
16mph |
W 20mph knots
W
20mph |
NW 25mph knots
NW
25mph |
NW 25mph knots
NW
25mph |
W 22mph knots
W
22mph |
W 23mph knots
W
23mph |
W 20mph knots
W
20mph |
W 18mph knots
W
18mph |
|
600m
|
600m | SW 9mph knots
SW
9mph |
W 13mph knots
W
13mph |
NW 17mph knots
NW
17mph |
NW 18mph knots
NW
18mph |
W 16mph knots
W
16mph |
W 17mph knots
W
17mph |
W 13mph knots
W
13mph |
SW 10mph knots
SW
10mph |
|
300m
|
300m | SW 5mph knots
SW
5mph |
W 9mph knots
W
9mph |
NW 12mph knots
NW
12mph |
NW 13mph knots
NW
13mph |
NW 12mph knots
NW
12mph |
W 13mph knots
W
13mph |
W 8mph knots
W
8mph |
SW 5mph knots
SW
5mph |
|
Valley
|
Valley | SW 5mph knots
SW
5mph |
W 9mph knots
W
9mph |
NW 13mph knots
NW
13mph |
NW 13mph knots
NW
13mph |
NW 12mph knots
NW
12mph |
W 13mph knots
W
13mph |
W 9mph knots
W
9mph |
SW 5mph knots
SW
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 20mph | 25mph | 31mph | 32mph | 28mph | 30mph | 25mph | 22mph |
|
600m
|
600m | 13mph | 17mph | 22mph | 24mph | 22mph | 24mph | 17mph | 14mph |
|
300m
|
300m | 12mph | 16mph | 22mph | 22mph | 21mph | 22mph | 15mph | 12mph |
|
Valley
|
Valley | 12mph | 16mph | 22mph | 23mph | 21mph | 23mph | 16mph | 13mph |
|
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 | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°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 |
|
300m
|
300m | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
| Freezing Level | Freezing Level |
2300m
|
2400m
|
2400m
|
2400m
|
2400m
|
1900m
|
1900m
|
2100m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C |
|
300m
|
300m | 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 | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
| Freezing Level | Freezing Level |
2300m
|
2400m
|
2400m
|
2400m
|
2400m
|
1900m
|
1900m
|
2100m
|
Additional weather information
Meteorologist's view
The brisk westerly breeze will made it feel rather chilly, so extra layers will needed. The sun still remains strong at this time of year, so protection may be needed during the sunnier moments. Conditions may deteriorate quickly the passage of any heavy showers.
Weather
Showers continuing through the early hours and morning, some heavy with a risk of hail and thunder. Turning drier and brighter through the afternoon, though a few showers still remain possible.
Chance of cloud-free hill tops
40% rising to 80% during the afternoon.
Low cloud and visibility
Frequent cloud will obscure hills, with bases down to around 400m at times during any heavy showers. This largely during the morning, with cloud largely above the summits for the afternoon. Visibility will be very good to excellent, but falling to moderate or poor in the passing of showers and very poor in any hill fog.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A bright day, with sunny spells and a scattering of showers. Cloud thickening later in the afternoon, with some rain likely by the evening.
Chance of cloud-free hill tops
70% throughout.
Maximum wind speed expected
Southwesterly 15-20 mph gusting 25-30 mph.
Temperature
- At 800m Plus 5 Celsius, rising to plus 8 Celsius.
- Valley Plus 9 Celsius rising to plus 20 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Occasional cloud bases down to around 600m at times during any showers, with a small chance of cloud bases down to 500m in any moderate showers. Visibility will be very good to excellent, but falling to moderate or poor in the passing of showers and very poor in any hill fog.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 2 Sep
Generally cloudy, with outbreaks of rain, which could be heavy at times. A brisk southwesterly wind.
Thu 3 Sep
Occasional bright or sunny spells and a scattering of showers. A brisk southwestyerly wind. Feeling humid.
Fri 4 Sep
Most likely cloudy and still humid, with the risk of some showery rain at times. A moderate southwesterly wind.
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.