Mountain weather
Eryri / Snowdonia
Confidence
High for overall story, moderate for variable cloud detail and low for valley fog. Moderate for rain and cloud through the weekend.
-
This eveningSunrise:Sunset:
-
Sat 25 JulSunrise:Sunset:
-
Sun 26 JulSunrise:Sunset:
-
Further outlook
This evening forecast
A dry and bright end to the day with patchy cloud and some evening sunshine and light to moderate westerly winds.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Mountain weather forecast
A dry and bright start with cloud and rain arriving from the north through the day.
|
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%
|
10%
|
10%
|
30%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | W 17mph knots
W
17mph |
W 19mph knots
W
19mph |
W 23mph knots
W
23mph |
W 28mph knots
W
28mph |
SW 27mph knots
SW
27mph |
W 22mph knots
W
22mph |
W 21mph knots
W
21mph |
W 19mph knots
W
19mph |
|
600m
|
600m | SW 9mph knots
SW
9mph |
SW 10mph knots
SW
10mph |
SW 13mph knots
SW
13mph |
W 19mph knots
W
19mph |
SW 19mph knots
SW
19mph |
SW 16mph knots
SW
16mph |
W 14mph knots
W
14mph |
W 11mph knots
W
11mph |
|
300m
|
300m | SW 3mph knots
SW
3mph |
SW 4mph knots
SW
4mph |
SW 4mph knots
SW
4mph |
W 13mph knots
W
13mph |
SW 13mph knots
SW
13mph |
SW 11mph knots
SW
11mph |
W 9mph knots
W
9mph |
W 5mph knots
W
5mph |
|
Valley
|
Valley | SW 3mph knots
SW
3mph |
SW 4mph knots
SW
4mph |
SW 5mph knots
SW
5mph |
W 13mph knots
W
13mph |
SW 13mph knots
SW
13mph |
W 11mph knots
W
11mph |
W 10mph knots
W
10mph |
W 5mph knots
W
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 20mph | 22mph | 27mph | 36mph | 34mph | 29mph | 27mph | 24mph |
|
600m
|
600m | 12mph | 13mph | 17mph | 26mph | 26mph | 22mph | 20mph | 15mph |
|
300m
|
300m | 8mph | 9mph | 12mph | 21mph | 24mph | 19mph | 16mph | 12mph |
|
Valley
|
Valley | 9mph | 10mph | 12mph | 22mph | 24mph | 20mph | 17mph | 12mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C |
|
600m
|
600m | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C |
|
300m
|
300m | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 18 degrees Celsius 18°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 16 degrees Celsius 16°C |
| Freezing Level | Freezing Level |
2900m
|
3000m
|
3400m
|
3300m
|
3500m
|
3200m
|
3400m
|
3300m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C |
|
300m
|
300m | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C |
|
Valley
|
Valley | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C |
| Freezing Level | Freezing Level |
2900m
|
3000m
|
3400m
|
3300m
|
3500m
|
3200m
|
3400m
|
3300m
|
Additional weather information
Meteorologist's view
A great day to be in the national park early in the day with moderate winds and plenty of dry and bright weather. Although UV levels will be high once again so sun protection is advised. As cloud arrives through the morning, highest peaks will become obscured making navigation more difficult with rain making some surfaces somewhat slippery.
Weather
After a bright start turning increasingly cloudy with a chance of occasional light showers. More persistent spells of rain are likely to arrive later in the day, with cloud also descending onto the slopes to obscure many higher routes, with winds also strengthening.
Chance of cloud-free hill tops
90% dropping to 30% through the afternoon.
Low cloud and visibility
Limited cloud initially with any cloud above summits and very good or excellent visibilities expected. Through the morning cloud will lower to obscure hills above 600m, with some patches possible as low as 400-500m, limiting views above this level. Any rain will also lead to visibilities falling to moderate.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy, obscuring some higher routes, especially in the west. Early rain clearing to light showers, before dying away later in the day. Some sunny intervals also likely with moderate westerly winds.
Chance of cloud-free hill tops
40% gradually rising to 70%
Maximum wind speed expected
Westerly 25-30 mph.
Temperature
- At 800m plus 8 Celsius rising to plus 11 Celsius.
- Valley plus 14 Celsius rising to plus 17 Celsius.
- Freezing level above summits.
Low cloud and visibility
Cloud bases initially obscuring hills above 500-600m, with some patches possible as low as 300-400m, limiting views above this level. Any showers will also lead to visibilities falling to moderate. Cloud bases lifting through the morning above most summits, with highest peaks still possibly obscured, leaving good or very good visibilities. Potentially dropping to moderate in showers through early afternoon.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 27 Jul
A mainly dry day with some brighter or sunny intervals, but also some patchy cloud, mainly through the morning. This perhaps thickening overnight.
Tue 28 Jul
Any early cloud gradually clearing, possibly lingering over highest peaks to the west, to leave a largely dry and fine day with good spells of sunshine. Turning warm again.
Wed 29 Jul
Another dry and fine day ahead with patchy cloud developing through the afternoon. In places this may be thick enough to create a very isolated light shower.
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.