Mountain weather
Eryri / Snowdonia
Confidence
High for a change to much cooler and windier weather by Wednesday. Low for the details of showers and possible thunderstorms over the next 24 hours.
-
Tue 4 AugSunrise:Sunset:
-
Wed 5 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
Poor Visibility
Thunderstorms
Heavy Persistent Rain
Mountain weather forecast
Breezy with a chance of rain or showers, possibly heavy in places.
|
Time
|
Time |
06:00
|
09:00
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12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
60%
|
60%
|
50%
|
40%
|
30%
|
60%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | S 35mph knots
S
35mph |
SW 25mph knots
SW
25mph |
SW 26mph knots
SW
26mph |
SW 30mph knots
SW
30mph |
SW 33mph knots
SW
33mph |
SW 29mph knots
SW
29mph |
|
600m
|
600m | S 21mph knots
S
21mph |
S 19mph knots
S
19mph |
SW 19mph knots
SW
19mph |
SW 22mph knots
SW
22mph |
SW 23mph knots
SW
23mph |
SW 21mph knots
SW
21mph |
|
300m
|
300m | S 12mph knots
S
12mph |
S 12mph knots
S
12mph |
S 13mph knots
S
13mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 14mph knots
SW
14mph |
|
Valley
|
Valley | S 13mph knots
S
13mph |
S 12mph knots
S
12mph |
S 13mph knots
S
13mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 13mph knots
SW
13mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 40mph | 31mph | 32mph | 38mph | 42mph | 36mph |
|
600m
|
600m | 26mph | 24mph | 26mph | 29mph | 30mph | 28mph |
|
300m
|
300m | 23mph | 22mph | 23mph | 26mph | 27mph | 25mph |
|
Valley
|
Valley | 23mph | 21mph | 22mph | 25mph | 26mph | 24mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 13 degrees Celsius 13°C | 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 |
|
600m
|
600m | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
|
300m
|
300m | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C |
|
Valley
|
Valley | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 19 degrees Celsius 19°C | 19 degrees Celsius 19°C | 18 degrees Celsius 18°C | 17 degrees Celsius 17°C |
| Freezing Level | Freezing Level |
3400m
|
3100m
|
3200m
|
3000m
|
2300m
|
2700m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 8 degrees Celsius 8°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 |
|
600m
|
600m | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
3400m
|
3100m
|
3200m
|
3000m
|
2300m
|
2700m
|
Additional weather information
Meteorologist's view
There's some uncertainty regarding when on Tuesday the chance of showers is highest, however be aware of what to do if caught in a thunderstorm, despite the risk being low.
Weather
Cloudier during Tuesday compared to Monday with a chance of showers. These could be heavy with a risk of thunder but many places will probably stay dry. Feeling humid and in any sunshine very warm.
Chance of cloud-free hill tops
30% west but 70% in the north and east.
Low cloud and visibility
Periods of cloud above 400-700m at times, lowest in the west, mainly associated with showers. Clearing some higher summits in the north at times. Poor or very poor visibility in the cloud with hill fog at times and temporarily poor in the rain/showers/thunderstorms, otherwise mainly good.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Often cloudy and rather windy with the possibility of the odd shower, though these likely brief and light. Bright at times with occasional glimmers of sunshine, especially during the afternoon. Feeling considerably cooler.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
Westerly 30 mph gusting 40 mph.
Temperature
- At 800m Plus 10 Celsius.
- Valley Plus 13 Celsius rising to plus 18 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Occasional patches of cloud may be close to higher summits, but most summits will see prolonged periods without any cloud. Poor or very poor visibility in summit cloud but generally excellent visibility.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 6 Aug
A generally dry day with variable cloud and bright spells. A few showers are possible. Light to moderate north-westerly winds.
Fri 7 Aug
Another day of variable cloud and scattered showers with light to moderate westerly winds.
Sat 8 Aug
Similar to Friday with a slightly higher chance of showers, perhaps longer spells of rain later. Moderate southwesterly winds.
Mountain weather information
Thu 6 Aug
A generally dry day with variable cloud and bright spells. A few showers are possible. Light to moderate north-westerly winds.
Fri 7 Aug
Another day of variable cloud and scattered showers with light to moderate westerly winds.
Sat 8 Aug
Similar to Friday with a slightly higher chance of showers, perhaps longer spells of rain later. Moderate southwesterly winds.
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.