Mountain weather
Eryri / Snowdonia
Confidence
Very high for the very warm and settled period to last until at least mid-week.
-
This eveningSunrise:Sunset:
-
Sun 24 MaySunrise:Sunset:
-
Mon 25 MaySunrise:Sunset:
-
Further outlook
This evening forecast
A fine evening with plenty of hazy sunshine but some patchy cloud near to the summits
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Mountain weather forecast
Hazy at first, then strong sunshine and blue skies and becoming very warm.
|
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%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | SW 15mph knots
SW
15mph |
SW 11mph knots
SW
11mph |
S 7mph knots
S
7mph |
SW 8mph knots
SW
8mph |
SW 10mph knots
SW
10mph |
SW 10mph knots
SW
10mph |
SW 9mph knots
SW
9mph |
S 12mph knots
S
12mph |
|
600m
|
600m | S 13mph knots
S
13mph |
S 11mph knots
S
11mph |
S 10mph knots
S
10mph |
SW 8mph knots
SW
8mph |
SW 9mph knots
SW
9mph |
SW 10mph knots
SW
10mph |
SW 8mph knots
SW
8mph |
S 9mph knots
S
9mph |
|
300m
|
300m | S 7mph knots
S
7mph |
S 7mph knots
S
7mph |
S 6mph knots
S
6mph |
SW 5mph knots
SW
5mph |
SW 6mph knots
SW
6mph |
SW 6mph knots
SW
6mph |
SW 4mph knots
SW
4mph |
SE 4mph knots
SE
4mph |
|
Valley
|
Valley | S 7mph knots
S
7mph |
S 7mph knots
S
7mph |
S 7mph knots
S
7mph |
S 5mph knots
S
5mph |
W 6mph knots
W
6mph |
W 6mph knots
W
6mph |
SW 4mph knots
SW
4mph |
S 4mph knots
S
4mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 19mph | 14mph | 9mph | 11mph | 14mph | 14mph | 12mph | 14mph |
|
600m
|
600m | 17mph | 14mph | 13mph | 11mph | 13mph | 13mph | 11mph | 11mph |
|
300m
|
300m | 14mph | 12mph | 10mph | 8mph | 10mph | 10mph | 8mph | 6mph |
|
Valley
|
Valley | 15mph | 13mph | 11mph | 8mph | 10mph | 9mph | 8mph | 6mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 15 degrees Celsius 15°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 15 degrees Celsius 15°C | 18 degrees Celsius 18°C | 19 degrees Celsius 19°C | 18 degrees Celsius 18°C | 16 degrees Celsius 16°C |
|
Valley
|
Valley | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 16 degrees Celsius 16°C | 18 degrees Celsius 18°C | 19 degrees Celsius 19°C | 19 degrees Celsius 19°C | 16 degrees Celsius 16°C |
| Freezing Level | Freezing Level |
3400m
|
3400m
|
3400m
|
2800m
|
2300m
|
2700m
|
3000m
|
3200m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
|
600m
|
600m | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C |
|
300m
|
300m | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 15 degrees Celsius 15°C |
|
Valley
|
Valley | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 16 degrees Celsius 16°C |
| Freezing Level | Freezing Level |
3400m
|
3400m
|
3400m
|
2800m
|
2300m
|
2700m
|
3000m
|
3200m
|
Additional weather information
Meteorologist's view
South and east facing slopes will quickly warm up in the strong sunshine and it will feel hot for walking by late morning. UV levels will become high and perhaps briefly very high near the summits so sun protection and staying hydrated is recommended.
Weather
Early high cloud may make the sunshine a little hazy first thing, but otherwise blue skies for most of the day with strong sunshine and high or very high UV levels.
Chance of cloud-free hill tops
Greater than 95%.
Low cloud and visibility
Banks or ribbons of cloud are possible on lower to middle slopes in the west, above 150-200m with the top of the cloud no higher than 400-500m, this rapidly clearing to leave little if any cloud from mid-morning. Visibility generally good but locally poor in cloud first thing. Distant hills are likely to remain quite hazy.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Any valley mist rapidly clearing after dawn to leave another sunny and unseasonably hot day.
Chance of cloud-free hill tops
100%.
Maximum wind speed expected
Southerly 20-25 mph.
Temperature
- At 800m Plus 13 Celsius rising to plus 23 Celsius.
- Valley Plus 12 Celsius rising to plus 29 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
A few fair weather clouds may form well above the summits around the middle of the day but otherwise little if any cloud is expected. Generally good visibilities but nearby hills and landmarks will appear hazy and distant hills will be faint or obscured by haze. Reduced air quality is likely.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Tue 26 May
Very warm and sunny with a light northeasterly breeze and high or very high UV levels. Moderate pollen levels.
Wed 27 May
Another sunny and very warm day but not feeling quite as hot due to a moderate to fresh easterly breeze. High or very high UV levels. Moderate pollen levels. A small chance of a shower overnight.
Thu 28 May
Probably staying generally dry and very warm with sunny periods but perhaps somewhat cloudier with a possibility of isolated showers or thunderstorms. Light to moderate winds, mostly southerly.
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.