Mountain weather
Eryri / Snowdonia
Confidence
High for overall changeable theme but low for intensity and clearance of rain on Saturday.
-
This eveningSunrise:Sunset:
-
Sat 12 SepSunrise:Sunset:
-
Sun 13 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Dry with variable cloud tonight.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Heavy Persistent Rain
Gales
Mountain weather forecast
Rain, heavy at times, clearing by the evening. Windy.
|
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 |
<5%
|
20%
|
60%
|
60%
|
80%
|
60%
|
50%
|
30%
|
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 15mph knots
SW
15mph |
W 12mph knots
W
12mph |
NW 8mph knots
NW
8mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
W 10mph knots
W
10mph |
SW 10mph knots
SW
10mph |
SW 15mph knots
SW
15mph |
|
600m
|
600m | SW 11mph knots
SW
11mph |
W 8mph knots
W
8mph |
SW 6mph knots
SW
6mph |
W 5mph knots
W
5mph |
W 7mph knots
W
7mph |
SW 8mph knots
SW
8mph |
SW 7mph knots
SW
7mph |
SW 10mph knots
SW
10mph |
|
300m
|
300m | SW 6mph knots
SW
6mph |
W 3mph knots
W
3mph |
W 3mph knots
W
3mph |
W 3mph knots
W
3mph |
W 5mph knots
W
5mph |
W 6mph knots
W
6mph |
SW 5mph knots
SW
5mph |
S 7mph knots
S
7mph |
|
Valley
|
Valley | SW 5mph knots
SW
5mph |
W 3mph knots
W
3mph |
W 3mph knots
W
3mph |
NW 3mph knots
NW
3mph |
NW 5mph knots
NW
5mph |
W 6mph knots
W
6mph |
SW 4mph knots
SW
4mph |
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 | 19mph | 15mph | 11mph | 9mph | 12mph | 15mph | 15mph | 21mph |
|
600m
|
600m | 15mph | 11mph | 8mph | 8mph | 11mph | 14mph | 11mph | 16mph |
|
300m
|
300m | 10mph | 6mph | 5mph | 6mph | 9mph | 12mph | 9mph | 12mph |
|
Valley
|
Valley | 9mph | 6mph | 5mph | 6mph | 9mph | 11mph | 6mph | 10mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 11 degrees Celsius 11°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 | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
600m
|
600m | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
|
300m
|
300m | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 17 degrees Celsius 17°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2800m
|
2700m
|
2700m
|
2600m
|
2600m
|
2700m
|
3000m
|
3000m
|
|
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 | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 7 degrees Celsius 7°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 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 | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 17 degrees Celsius 17°C | 14 degrees Celsius 14°C |
| Freezing Level | Freezing Level |
2800m
|
2700m
|
2700m
|
2600m
|
2600m
|
2700m
|
3000m
|
3000m
|
Additional weather information
Meteorologist's view
Wet and windy with waterproofs advised.
Weather
Cloud thickening and lowering during the early hours, then a band of heavy and persistent rain moving across the Park from early morning and into the afternoon, perhaps turning patchier and lighter later in the evening. The winds will strengthen overnight, becoming strong and gusty, with a risk of gales on higher summits.
Chance of cloud-free hill tops
20% rising later to 60% by late afternoon.
Low cloud and visibility
Widespread low cloud developing overnight with bases 400-500m, patches down to 200-300m, especially across southwestern facing hills. Moderate to poor visibility in rain, very poor in low cloud.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A damp start with hill fog through the early hours. Conditions improving with sunnier spells likely, especially in the north of the Park by the afternoon. Much lighter winds.
Chance of cloud-free hill tops
20% early on, soon 60% to the northeast.
Maximum wind speed expected
Westerly 10-15 mph.
Temperature
- At 800m Plus 8 Celsius rising to plus 11 Celsius
- Valley Plus 15 Celsius rising to plus 18 Celsius
- Freezing level Above summits.
Low cloud and visibility
Low cloud and hill fog lifting and breaking by the afternoon in the northeast, cloud shrouding summits in the west. Good visibility outside rain and low cloud, otherwise generally poor.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 14 Sep
Staying largely cloudy with hill fog and drizzle. Moderate to fresh southwesterly.
Tue 15 Sep
Rain clearing to leave sunny spells. Feeling fresher. Fresh northwesterly.
Wed 16 Sep
Largely dry with sunny intervals. Moderate to fresh westerly.
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.