Mountain weather
Eryri / Snowdonia
Confidence
High for overall change to more unsettled weather but low for location and intensity of rainfall throughout.
-
This eveningSunrise:Sunset:
-
Tue 25 AugSunrise:Sunset:
-
Wed 26 AugSunrise:Sunset:
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Further outlook
This evening forecast
Plenty of dry and bright weather to come for the evening with a moderate easterly breeze.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Thunderstorms
Mountain weather forecast
Generally dry and bright with some showers possible later.
|
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 |
10%
|
10%
|
10%
|
10%
|
10%
|
20%
|
30%
|
60%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | E 31mph knots
E
31mph |
E 29mph knots
E
29mph |
E 32mph knots
E
32mph |
E 26mph knots
E
26mph |
E 20mph knots
E
20mph |
SE 18mph knots
SE
18mph |
E 22mph knots
E
22mph |
E 33mph knots
E
33mph |
|
600m
|
600m | E 16mph knots
E
16mph |
E 16mph knots
E
16mph |
E 16mph knots
E
16mph |
E 19mph knots
E
19mph |
E 15mph knots
E
15mph |
SE 13mph knots
SE
13mph |
E 13mph knots
E
13mph |
E 19mph knots
E
19mph |
|
300m
|
300m | E 14mph knots
E
14mph |
E 13mph knots
E
13mph |
E 13mph knots
E
13mph |
E 17mph knots
E
17mph |
E 12mph knots
E
12mph |
SE 10mph knots
SE
10mph |
E 9mph knots
E
9mph |
E 15mph knots
E
15mph |
|
Valley
|
Valley | E 13mph knots
E
13mph |
SE 12mph knots
SE
12mph |
SE 12mph knots
SE
12mph |
E 17mph knots
E
17mph |
E 12mph knots
E
12mph |
SE 10mph knots
SE
10mph |
E 9mph knots
E
9mph |
E 14mph knots
E
14mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 41mph | 38mph | 39mph | 33mph | 27mph | 23mph | 28mph | 43mph |
|
600m
|
600m | 29mph | 28mph | 28mph | 28mph | 21mph | 19mph | 19mph | 30mph |
|
300m
|
300m | 28mph | 26mph | 25mph | 28mph | 20mph | 18mph | 18mph | 29mph |
|
Valley
|
Valley | 27mph | 25mph | 24mph | 28mph | 20mph | 18mph | 18mph | 27mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||||
|
600m
|
600m | ||||||||
|
300m
|
300m | ||||||||
|
Valley
|
Valley | ||||||||
| Freezing Level | Freezing Level |
2100m
|
2000m
|
2000m
|
2500m
|
2900m
|
3000m
|
3100m
|
3100m
|
Additional weather information
Meteorologist's view
A fine day for any outdoor activities in the park, UV levels remaining high so sun protection advisable. There is a risk of showers through the afternoon with a low risk of some heavier bursts so waterproof may be recommended.
Weather
Some patchy cloud around the park at first but this is expected to lift and break to leave a generally dry and bight day ahead with sunshine turning hazy at times through the day. There is a risk of some isolated showers through the late afternoon, which may have the odd heavier burst and a very low risk of the odd rumble of thunder.
Chance of cloud-free hill tops
30% quickly rising to >95%.
Low cloud and visibility
Some patchy cloud, bases above 500-600 m. This is expected to quickly lift and break with all bases soon rising above summits. Visibilities many be moderate or poor initially in cloud but very good visibilities expected outside this. Visibilities may drop to moderate in passing showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
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 and showers clear to the east.
Chance of cloud-free hill tops
40% from dawn gradually rising to >95% by the late-afternoon.
Maximum wind speed expected
Southeasterly 15-20 mph.
Temperature
- At 800m plus 8 Celsius, rising to plus 13 Celsius.
- Valley plus 16 Celsius, rising to plus 22 Celsius.
- Freezing level above summits.
Low cloud and visibility
Cloud bases initially above summits but patchy lower cloud is then expected to spread in from the southwest with bases above 400-500m. Through the afternoon low cloud is expected to clear away leaving all bases above summits. Good or very good visibilities are expected but visibilities may become moderate or poor in patchy lower cloud through the morning. Visibilities may also drop to moderate or potentially poor in passing showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 27 Aug
Showers or longer spells of heavy rain, once again potentially thundery at times. Potentially turning quite windy but confidence on the details are low at this stage.
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.
Sat 29 Aug
A drier and brighter start to the day, with a band of cloud and rain spreading in from the west through the afternoon.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations