Mountain weather
Eryri / Snowdonia
Confidence
High for generally dry and settled weather on Tuesday. Moderate for cloud/sunshine amounts. Low for details on Wednesday on how much rain and cloud is expected.
-
This eveningSunrise:Sunset:
-
Tue 22 SepSunrise:Sunset:
-
Wed 23 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Low cloud and with hill fog and light drizzle to end the day.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Severe Chill Effect
Thunderstorms
Heavy Persistent Rain
Strong Sunlight
Mountain weather forecast
Staying dry with sunny spells into 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 |
20%
|
20%
|
20%
|
10%
|
10%
|
10%
|
10%
|
10%
|
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 11mph knots
SW
11mph |
SW 14mph knots
SW
14mph |
SW 16mph knots
SW
16mph |
NW 20mph knots
NW
20mph |
NW 20mph knots
NW
20mph |
NW 17mph knots
NW
17mph |
N 12mph knots
N
12mph |
N 9mph knots
N
9mph |
|
600m
|
600m | S 10mph knots
S
10mph |
SW 10mph knots
SW
10mph |
SW 11mph knots
SW
11mph |
NW 14mph knots
NW
14mph |
NW 15mph knots
NW
15mph |
N 14mph knots
N
14mph |
N 8mph knots
N
8mph |
N 6mph knots
N
6mph |
|
300m
|
300m | S 5mph knots
S
5mph |
S 6mph knots
S
6mph |
SW 7mph knots
SW
7mph |
NW 11mph knots
NW
11mph |
NW 12mph knots
NW
12mph |
N 12mph knots
N
12mph |
N 7mph knots
N
7mph |
N 4mph knots
N
4mph |
|
Valley
|
Valley | S 5mph knots
S
5mph |
S 5mph knots
S
5mph |
SW 6mph knots
SW
6mph |
NW 11mph knots
NW
11mph |
NW 12mph knots
NW
12mph |
NW 12mph knots
NW
12mph |
NW 8mph knots
NW
8mph |
N 5mph knots
N
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 14mph | 19mph | 21mph | 28mph | 29mph | 27mph | 19mph | 14mph |
|
600m
|
600m | 13mph | 14mph | 16mph | 21mph | 23mph | 23mph | 15mph | 10mph |
|
300m
|
300m | 11mph | 12mph | 15mph | 20mph | 21mph | 22mph | 13mph | 9mph |
|
Valley
|
Valley | 10mph | 11mph | 13mph | 19mph | 22mph | 23mph | 15mph | 9mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 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 | 6 degrees Celsius 6°C | 4 degrees Celsius 4°C |
|
600m
|
600m | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
2300m
|
2500m
|
2400m
|
2300m
|
1900m
|
1700m
|
1600m
|
1500m
|
|
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 | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 1 degrees Celsius 1°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°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 |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
2300m
|
2500m
|
2400m
|
2300m
|
1900m
|
1700m
|
1600m
|
1500m
|
Additional weather information
Meteorologist's view
Although it'll be mostly cloudy, there will be some breaks and bright or even sunny spells.
Weather
Plenty of dry weather expected but patchy cloud around. Low cloud to begin with but will start to lift by midday. There will be breaks in the cloud, leading to the odd sunny spell, mostly in the west.
Chance of cloud-free hill tops
30%
Low cloud and visibility
Extensive cloud between 400-800m through the morning with a chance that the highest summits could temporarily poke through the top of the cloud sheet. Cloud lifting to give periods above 600-900m by the afternoon. Poor or very poor visibility in the cloud but good at lower levels.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Some scattered showers through the morning and low cloud. This will lead to some heavy rain by the mid morning until midday. There is a bit of uncertainty as to the amount and how persistent this rain will be. Clearing later with some drier and sunny spells in the afternoon.
Chance of cloud-free hill tops
20% becoming 60%.
Maximum wind speed expected
Westerly to northwesterly 20-25 mph.
Temperature
- At 800m Plus 12 Celsius.
- Valley Plus 14 Celsius rising to plus 18 Celsius.
- Freezing level Above all summits.
Low cloud and visibility
Low cloud and poor visibility through the morning, especially during period of heavy rain. Cloud will lift into the afternoon to above 600-800, with improving visibility.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 24 Sep
After a cold start with a chance of a valley frost, a fine day is likely with some sunshine. Moderate to fresh southerly winds.
Fri 25 Sep
Turning more unsettled with rain at times. Moderate to fresh southwesterly winds
Sat 26 Sep
Patchy light rain with variable cloud.
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.