Mountain weather
Eryri / Snowdonia
Confidence
High for overall story, moderate for showers Monday evening and for low, patchy cloud feeding in on Monday.
-
Mon 27 JulSunrise:Sunset:
-
Tue 28 JulSunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Poor Visibility
Mountain weather forecast
A generally dry day with variable cloud and some bright or sunny spells.
|
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 |
20%
|
10%
|
10%
|
10%
|
20%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | W 20mph knots
W
20mph |
W 20mph knots
W
20mph |
SW 19mph knots
SW
19mph |
SW 21mph knots
SW
21mph |
SW 22mph knots
SW
22mph |
SW 20mph knots
SW
20mph |
|
600m
|
600m | W 13mph knots
W
13mph |
W 16mph knots
W
16mph |
SW 17mph knots
SW
17mph |
SW 18mph knots
SW
18mph |
SW 15mph knots
SW
15mph |
S 14mph knots
S
14mph |
|
300m
|
300m | W 8mph knots
W
8mph |
W 11mph knots
W
11mph |
SW 12mph knots
SW
12mph |
SW 12mph knots
SW
12mph |
SW 10mph knots
SW
10mph |
S 9mph knots
S
9mph |
|
Valley
|
Valley | W 8mph knots
W
8mph |
W 11mph knots
W
11mph |
SW 12mph knots
SW
12mph |
SW 12mph knots
SW
12mph |
SW 10mph knots
SW
10mph |
S 9mph knots
S
9mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 24mph | 25mph | 25mph | 28mph | 28mph | 25mph |
|
600m
|
600m | 16mph | 21mph | 22mph | 24mph | 20mph | 19mph |
|
300m
|
300m | 13mph | 17mph | 19mph | 20mph | 18mph | 16mph |
|
Valley
|
Valley | 13mph | 17mph | 19mph | 20mph | 18mph | 16mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||
|
600m
|
600m | ||||||
|
300m
|
300m | ||||||
|
Valley
|
Valley | ||||||
| Freezing Level | Freezing Level |
3200m
|
3400m
|
3500m
|
3500m
|
3500m
|
3600m
|
Additional weather information
Meteorologist's view
Navigation will be challenging on exposed routes with low cloud covering peaks. Conditions improve around midday as cloud lifts and breaks, offering the best chance of good visibility and distant views. Conditions, particularly over higher routes, deteriorating once again through the afternoon.
Weather
Cloudy to start Tuesday which may lead to some cloud covering higher peaks. This should lift and break during Monday morning before a band of thicker and lower cloud arrives from the west through Monday afternoon, obscuring some higher routes. Best of sunshine probably near coasts. The odd bit of patchy rain possible late afternoon and into the evening.
Chance of cloud-free hill tops
30% rising to 80% for the early afternoon period, dropping to 30% once more through the late afternoon.
Low cloud and visibility
Cloud bases initially above 600-700m, this will gradually lift and break as the morning progresses rising above summits. Poor or very poor visibility in any cloud or hill fog, good visibility outside cloud. Very good or excellent visibilities through the afternoon with views of distant peaks possible. Through the afternoon and into the evening lower cloud is expected to push in from the west, cloud bases between 500-700m, shrouding the highest peaks at times leading to poor visibilities.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy to start Tuesday much of this cloud low enough to shroud highest peaks. Cloud will gradually lift and clear to leave a dry afternoon with some brighter spells. Cloud potentially lingering over highest peaks through much of the day.
Chance of cloud-free hill tops
20% gradually rising to 40%.
Maximum wind speed expected
Southwesterly 25mph.
Temperature
- At 800m plus 11 Celsius rising to plus 14 Celsius.
- Valley plus 16 Celsius rising to plus 20 Celsius.
- Freezing level above summits.
Low cloud and visibility
Cloud bases initially above 500-700m with some patchy cloud above 400m. This will gradually lift and break as the morning progresses but likely to linger between 700-900m. Poor or very poor visibility in any cloud or hill fog, good visibility outside cloud. Very good or excellent visibilities below 700m through the afternoon with views of distant peaks possible.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 29 Jul
A dry and bright day with plenty of length sunshine. Some patchy cloud arriving from the west later.
Thu 30 Jul
Another day of variable cloud and bright spells, with the risk of some showers through the early morning. Sunshine increasing through the afternoon.
Fri 31 Jul
Another dry and bright day ahead with plenty of lengthy sunshine, some patch cloud around at times.
Mountain weather information
Wed 29 Jul
A dry and bright day with plenty of length sunshine. Some patchy cloud arriving from the west later.
Thu 30 Jul
Another day of variable cloud and bright spells, with the risk of some showers through the early morning. Sunshine increasing through the afternoon.
Fri 31 Jul
Another dry and bright day ahead with plenty of lengthy sunshine, some patch cloud around at times.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations