Mountain weather
Eryri / Snowdonia
Confidence
High confidence for a changeable theme. Lower for the clearance of low cloud and rain tomorrow and intensity of showers by the afternoon.
-
This eveningSunrise:Sunset:
-
Wed 30 SepSunrise:Sunset:
-
Thu 1 OctSunrise:Sunset:
-
Further outlook
This evening forecast
Dry initially but turning wet and windy into the night with heavy, persistent rain.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Poor Visibility
Thunderstorms
Heavy Persistent Rain
Mountain weather forecast
A very wet and windy start. Rain clearing with blustery showers by the afternoon.
|
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 |
90%
|
90%
|
40%
|
40%
|
60%
|
60%
|
60%
|
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 22mph knots
SW
22mph |
SW 20mph knots
SW
20mph |
SW 18mph knots
SW
18mph |
SW 19mph knots
SW
19mph |
SW 20mph knots
SW
20mph |
SW 22mph knots
SW
22mph |
SW 21mph knots
SW
21mph |
S 25mph knots
S
25mph |
|
600m
|
600m | S 14mph knots
S
14mph |
SW 12mph knots
SW
12mph |
SW 12mph knots
SW
12mph |
SW 13mph knots
SW
13mph |
SW 14mph knots
SW
14mph |
SW 17mph knots
SW
17mph |
SW 15mph knots
SW
15mph |
S 17mph knots
S
17mph |
|
300m
|
300m | S 9mph knots
S
9mph |
S 8mph knots
S
8mph |
S 8mph knots
S
8mph |
SW 10mph knots
SW
10mph |
SW 12mph knots
SW
12mph |
SW 15mph knots
SW
15mph |
SW 12mph knots
SW
12mph |
S 14mph knots
S
14mph |
|
Valley
|
Valley | S 9mph knots
S
9mph |
S 7mph knots
S
7mph |
S 7mph knots
S
7mph |
SW 9mph knots
SW
9mph |
SW 11mph knots
SW
11mph |
SW 13mph knots
SW
13mph |
S 10mph knots
S
10mph |
S 11mph knots
S
11mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 28mph | 26mph | 23mph | 26mph | 30mph | 33mph | 30mph | 34mph |
|
600m
|
600m | 20mph | 18mph | 17mph | 21mph | 24mph | 28mph | 23mph | 26mph |
|
300m
|
300m | 18mph | 15mph | 14mph | 18mph | 21mph | 27mph | 21mph | 24mph |
|
Valley
|
Valley | 17mph | 14mph | 14mph | 16mph | 19mph | 23mph | 18mph | 20mph |
|
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 | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
600m
|
600m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
|
Valley
|
Valley | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
| Freezing Level | Freezing Level |
1900m
|
1800m
|
1700m
|
1600m
|
1700m
|
1700m
|
1700m
|
2000m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
300m
|
300m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
1900m
|
1800m
|
1700m
|
1600m
|
1700m
|
1700m
|
1700m
|
2000m
|
Additional weather information
Meteorologist's view
Very poor conditions overnight until dawn with waterproofs required if heading out early doors. Expect strong, gusty winds with buffeting. Conditions quickly improving by the morning with the risk of thunder in any downpours.
Weather
Very wet and windy overnight with a band of heavy rain clearing most of the park by dawn. Thereafter a breezy day with sunny spells and showers, some may be heavy at times carrying the risk of thunder.
Chance of cloud-free hill tops
10% overnight, becoming 80% by mid-morning.
Low cloud and visibility
Low cloud down to 400-500m first thing, dropping in heavier bursts of rain, otherwise rising mostly at or above summits by mid-morning. Poor visibility during the morning then very good, although may deteriorate temporarily in afternoon showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A variable day with sunshine and showers. These heaviest and most frequent during the morning before easing into the afternoon. Winds lighter than Wednesday.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
Southwesterly 15-20 mph gusting 25 mph.
Temperature
- At 800m Plus 5 Celsius rising to plus 7 Celsius.
- Valley Plus 11 Celsius rising to plus 15 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Early mist and fog clearing. Patchy cloud close to summits during the morning, otherwise cloud bases above with good views of distant hills.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 2 Oct
Outbreaks of heavy, sporadic rain, thundery at times mixed with dry spells. Moderate to fresh southwesterly winds.
Sat 3 Oct
More settled on Saturday but largely cloudy. Still the risk of the odd shower but light and variable winds.
Sun 4 Oct
Early mist and fog clearing then sunny spells. Light 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.