Mountain weather
Eryri / Snowdonia
Confidence
High for overall change to more unsettled conditions. Low with respect to detail of showers.
-
Wed 26 AugSunrise:Sunset:
-
Thu 27 AugSunrise:Sunset:
-
Further outlook
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
A band of rain and showers pushes north, followed by brighter skies and a continued risk of showers.
|
Time
|
Time |
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 |
60%
|
60%
|
40%
|
40%
|
20%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | SE 18mph knots
SE
18mph |
SE 23mph knots
SE
23mph |
SE 16mph knots
SE
16mph |
SE 13mph knots
SE
13mph |
E 12mph knots
E
12mph |
E 16mph knots
E
16mph |
|
600m
|
600m | SE 14mph knots
SE
14mph |
SE 14mph knots
SE
14mph |
SE 11mph knots
SE
11mph |
S 8mph knots
S
8mph |
NE 5mph knots
NE
5mph |
E 10mph knots
E
10mph |
|
300m
|
300m | SE 7mph knots
SE
7mph |
SE 7mph knots
SE
7mph |
SE 6mph knots
SE
6mph |
S 6mph knots
S
6mph |
SE 3mph knots
SE
3mph |
E 7mph knots
E
7mph |
|
Valley
|
Valley | SE 7mph knots
SE
7mph |
SE 7mph knots
SE
7mph |
SE 6mph knots
SE
6mph |
S 6mph knots
S
6mph |
S 4mph knots
S
4mph |
SE 6mph knots
SE
6mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 22mph | 27mph | 20mph | 17mph | 15mph | 21mph |
|
600m
|
600m | 22mph | 19mph | 15mph | 11mph | 9mph | 16mph |
|
300m
|
300m | 15mph | 14mph | 13mph | 10mph | 7mph | 15mph |
|
Valley
|
Valley | 15mph | 14mph | 13mph | 9mph | 8mph | 13mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
|
600m
|
600m | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
|
300m
|
300m | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 18 degrees Celsius 18°C | 19 degrees Celsius 19°C | 18 degrees Celsius 18°C | 17 degrees Celsius 17°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 19 degrees Celsius 19°C | 20 degrees Celsius 20°C | 19 degrees Celsius 19°C | 18 degrees Celsius 18°C |
| Freezing Level | Freezing Level |
3200m
|
3100m
|
3100m
|
3100m
|
2900m
|
2900m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 10 degrees Celsius 10°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 14 degrees Celsius 14°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 18 degrees Celsius 18°C | 19 degrees Celsius 19°C | 19 degrees Celsius 19°C | 16 degrees Celsius 16°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 17 degrees Celsius 17°C | 19 degrees Celsius 19°C | 21 degrees Celsius 21°C | 20 degrees Celsius 20°C | 18 degrees Celsius 18°C |
| Freezing Level | Freezing Level |
3200m
|
3100m
|
3100m
|
3100m
|
2900m
|
2900m
|
Additional weather information
Meteorologist's view
A showery day across the park with the risk some heavier bursts means that adequate waterproofs are necessary. UV levels remaining high in sunny spells between showers so sun protection advisable.
Weather
A cloudier start to the day with showers, potentially heavy and thundery at times spreading in from the south through the morning. Likely turning drier and brighter through the afternoon as the cloud. A low risk of the odd isolated shower remains, these again have the potential to be heavy and thundery at times.
Chance of cloud-free hill tops
20% gradually rising to 90% through the morning.
Low cloud and visibility
Cloud bases initially above summits but widespread lower cloud is then expected to spread in from the southwest around dawn, with bases above 400-500m. Through the afternoon low cloud is expected to clear leaving all bases above summits. Very good views are expected but visibilities may become poor or very poor in patchy low cloud through the morning. Visibilities may also drop to moderate or potentially poor in passing showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A rather cloudy to start to Thursday as a band heavy, persistent showers pushes north into the Park. This has the potential to bring heavy thundery downpours as well as the possibility of hail. This more persistent rain and showers are expected become slow moving over the area through Thursday with a continued risk of hail as well as thunder.
Chance of cloud-free hill tops
10% gradually rising to 40% through the morning.
Maximum wind speed expected
Southerly 15 mph.
Temperature
- At 800m plus 7 Celsius, rising to plus 12 Celsius.
- Valley plus 14 Celsius, rising to plus 20 Celsius.
- Freezing level above summits.
Low cloud and visibility
Extensive low cloud is then expected to spread in from the south, with bases above 300-400 m. This may lift slightly though the afternoon but still likely to form bases above 600-700m, although becoming patchier in nature. Visibilities may also drop to moderate or poor in passing showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 28 Aug
Another unsettled day ahead with showers or heavy spells of rain likely with widely windy conditions. However low confidence in details around heaviest rain currently. Skies likely to turn drier and brighter through the afternoon.
Sat 29 Aug
A band of cloud and rain spreading in from the west through the morning. With a drier and brighter afternoon to follow. Fresh westerly winds.
Sun 30 Aug
A drier and brighter start to the day with the risk of some showers. Before a band of cloud and rain arrives from the west.
Mountain weather information
Fri 28 Aug
Another unsettled day ahead with showers or heavy spells of rain likely with widely windy conditions. However low confidence in details around heaviest rain currently. Skies likely to turn drier and brighter through the afternoon.
Sat 29 Aug
A band of cloud and rain spreading in from the west through the morning. With a drier and brighter afternoon to follow. Fresh westerly winds.
Sun 30 Aug
A drier and brighter start to the day with the risk of some showers. Before a band of cloud and rain arrives from the west.
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.