Mountain weather
Eryri / Snowdonia
Confidence
High confidence for an unsettled period with heavy rain, possibly thundery in places, followed by showers. Lower for distribution of any thundery downpours.
-
This eveningSunrise:Sunset:
-
Sat 29 AugSunrise:Sunset:
-
Sun 30 AugSunrise:Sunset:
-
Further outlook
This evening forecast
Showers easing and remaining cloudy.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Heavy Persistent Rain
Thunderstorms
Mountain weather forecast
Heavy persistent rain, becoming more showery by the evening.
|
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 |
40%
|
40%
|
70%
|
70%
|
70%
|
70%
|
70%
|
70%
|
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 19mph knots
SW
19mph |
SW 19mph knots
SW
19mph |
S 16mph knots
S
16mph |
SE 18mph knots
SE
18mph |
E 21mph knots
E
21mph |
SE 15mph knots
SE
15mph |
NW 12mph knots
NW
12mph |
NW 15mph knots
NW
15mph |
|
600m
|
600m | SW 12mph knots
SW
12mph |
SW 14mph knots
SW
14mph |
S 13mph knots
S
13mph |
SE 11mph knots
SE
11mph |
E 14mph knots
E
14mph |
S 11mph knots
S
11mph |
NW 9mph knots
NW
9mph |
NW 11mph knots
NW
11mph |
|
300m
|
300m | S 7mph knots
S
7mph |
S 9mph knots
S
9mph |
S 7mph knots
S
7mph |
SE 6mph knots
SE
6mph |
E 7mph knots
E
7mph |
S 7mph knots
S
7mph |
NW 6mph knots
NW
6mph |
NW 7mph knots
NW
7mph |
|
Valley
|
Valley | S 7mph knots
S
7mph |
S 9mph knots
S
9mph |
S 7mph knots
S
7mph |
SE 6mph knots
SE
6mph |
E 7mph knots
E
7mph |
S 7mph knots
S
7mph |
NW 6mph knots
NW
6mph |
NW 7mph knots
NW
7mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 23mph | 24mph | 20mph | 22mph | 27mph | 20mph | 15mph | 19mph |
|
600m
|
600m | 16mph | 20mph | 17mph | 15mph | 20mph | 16mph | 12mph | 14mph |
|
300m
|
300m | 14mph | 17mph | 14mph | 12mph | 15mph | 13mph | 10mph | 12mph |
|
Valley
|
Valley | 14mph | 17mph | 13mph | 12mph | 14mph | 12mph | 11mph | 12mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 12 degrees Celsius 12°C | 12 degrees Celsius 12°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 | 11 degrees Celsius 11°C |
|
600m
|
600m | 14 degrees Celsius 14°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 | 12 degrees Celsius 12°C |
|
300m
|
300m | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2800m
|
2800m
|
2800m
|
2900m
|
3200m
|
3100m
|
3100m
|
3000m
|
|
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 | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
600m
|
600m | 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 | 11 degrees Celsius 11°C |
|
300m
|
300m | 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 | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2800m
|
2800m
|
2800m
|
2900m
|
3200m
|
3100m
|
3100m
|
3000m
|
Additional weather information
Meteorologist's view
Waterproofs advisable with good navigational skills given heavy persistent rain.
Weather
A cloudy and wet start to the day as a band of rain moves in from the southwest. Rain becoming persistent during most of the day with only occasional breaks during the late afternoon. Drier by late evening but remaining cloudy with drizzle.
Chance of cloud-free hill tops
10%
Low cloud and visibility
Extensive low cloud with bases between 400-600m, this is likely to shroud highest peaks. This is expected to turn patchier in nature through the afternoon. Generally very poor visibilities given rain and showers, moderate in between.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Largely dry initially with the odd shower to the west of the park. These becoming more extensive into the afternoon with heavy, thundery showers developing. These bringing the risk of hail and lightning, with gusty winds and merging to give longer spells of rain from late afternoon.
Chance of cloud-free hill tops
60% but dipping in heavy showers.
Maximum wind speed expected
Southwesterly 20-25 mph gusting 30 mph at times.
Temperature
- At 800m Plus 10 Celsius rising to plus 14 Celsius.
- Valley Plus 15 Celsius rising to plus 20 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patchy cloud above 400 m initially, then mostly above or shrouding summits. Good visibilities outside showers otherwise very poor.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 31 Aug
Remaining unsettled with showers, heavy at times. Fresh northwesterly winds.
Tue 1 Sep
Further showers but less intense and lighter winds than of late.
Wed 2 Sep
Changeable with cloud and rain. Fresh winds.
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.