Mountain weather
Eryri / Snowdonia
Confidence
High for a mostly settled Sunday. Moderate for details of rain or showers next week.
-
Sun 16 AugSunrise:Sunset:
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Mon 17 AugSunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Mountain weather forecast
Another generally dry and bright day with variable cloud and sunny spells.
|
Time
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Time |
06:00
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09:00
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12:00
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15:00
|
18:00
|
21:00
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|---|---|---|---|---|---|---|---|
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Weather
(at 800m)
|
Weather symbols |  |
|
 |
|
 |
|
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
20%
|
20%
|
10%
|
10%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | NW 5mph knots
NW
5mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
W 11mph knots
W
11mph |
SW 12mph knots
SW
12mph |
SW 16mph knots
SW
16mph |
|
600m
|
600m | SW 4mph knots
SW
4mph |
NW 5mph knots
NW
5mph |
W 8mph knots
W
8mph |
W 10mph knots
W
10mph |
SW 11mph knots
SW
11mph |
S 14mph knots
S
14mph |
|
300m
|
300m | SW 1mph knots
SW
1mph |
NW 3mph knots
NW
3mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
SW 6mph knots
SW
6mph |
S 8mph knots
S
8mph |
|
Valley
|
Valley | SW 1mph knots
SW
1mph |
NW 3mph knots
NW
3mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
SW 6mph knots
SW
6mph |
S 7mph knots
S
7mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 6mph | 8mph | 11mph | 15mph | 16mph | 20mph |
|
600m
|
600m | 5mph | 6mph | 11mph | 14mph | 14mph | 18mph |
|
300m
|
300m | 2mph | 4mph | 9mph | 12mph | 11mph | 15mph |
|
Valley
|
Valley | 2mph | 4mph | 9mph | 11mph | 10mph | 14mph |
|
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 |
3300m
|
3300m
|
3400m
|
3300m
|
3200m
|
3100m
|
Additional weather information
Meteorologist's view
An excellent day for any outdoor activities in the national park. Feeling a little cooler than recent days, but still warm in the sunshine and out of the breeze. Sun protection advisable especially during the afternoon.
Weather
A generally dry day, however the odd spot of light rain cannot be ruled out through the morning under thicker cloud. Skies turning brighter through the afternoon with some sunny spells developing.
Chance of cloud-free hill tops
70% quickly rising to 90% through the morning.
Low cloud and visibility
Same patchy cloud with bases above 800-900 meters initially may briefly shroud highest peak. Through the afternoon all summits are expected to be free of cloud. Very good or excellent visibilities are expected with views of distant peaks possible but locally very poor in cloud and hill fog.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A rather cloudy start to Monday with low cloud and hill fog likely, the odd shower is also possible through the morning. Turning brighter through the afternoon, albeit with some cloud lingering to the west of the park. Lower cloud then becomes more widespread once again after dusk.
Chance of cloud-free hill tops
10% gradually rising to 90% by the afternoon.
Maximum wind speed expected
Westerly 15-20 mph.
Temperature
- At 800m plus 8 Celsius rising to plus 11 Celsius.
- Valley plus 16 Celsius rising to plus 19 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Extensive low cloud with bases above 400-500m, with patchy cloud above 300m, will initially shroud highest peak. By the afternoon all cloud bases are expected to lift above summits. Locally poor visibility in hill fog at first, but otherwise very good visibility with distant views of landmarks and mountains.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Tue 18 Aug
Cloud with extensive hill fog through much of the morning. Outbreaks of rain likely with potential heavy bursts at times. Cloud and rain gradually clearing south allowing for a drier and brighter afternoon. Light to moderate westerly winds.
Wed 19 Aug
A drier and brighter day with isolated showers and sunny spells. Light to moderate westerly winds.
Thu 20 Aug
Another bright day with sunny spells, showers turning more frequent with potential heavier bursts. Light to moderate southwesterly winds.
Mountain weather information
Tue 18 Aug
Cloud with extensive hill fog through much of the morning. Outbreaks of rain likely with potential heavy bursts at times. Cloud and rain gradually clearing south allowing for a drier and brighter afternoon. Light to moderate westerly winds.
Wed 19 Aug
A drier and brighter day with isolated showers and sunny spells. Light to moderate westerly winds.
Thu 20 Aug
Another bright day with sunny spells, showers turning more frequent with potential heavier bursts. Light to moderate southwesterly winds.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations