Mountain weather
Eryri / Snowdonia
Confidence
Some uncertainty regarding shower details on Tuesday, notably regarding intensity and any associated thunder risk. Some uncertainty with regards timing and extent of rain moving through the area Wednesday night. Otherwise confidence fairly high, and also regarding the likelihood of temperatures starting to climb again from this weekend.
-
Tue 30 JunSunrise:Sunset:
-
Wed 1 JulSunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Thunderstorms
Heavy Persistent Rain
Mountain weather forecast
Mist and patchy rain giving way to heavy showers, with possible thunder. A drier evening with cloud shrouding summits.
|
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 |
40%
|
70%
|
90%
|
50%
|
30%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | S 26mph knots
S
26mph |
S 29mph knots
S
29mph |
SW 27mph knots
SW
27mph |
SW 23mph knots
SW
23mph |
SW 16mph knots
SW
16mph |
W 14mph knots
W
14mph |
|
600m
|
600m | S 20mph knots
S
20mph |
S 21mph knots
S
21mph |
SW 21mph knots
SW
21mph |
SW 18mph knots
SW
18mph |
SW 13mph knots
SW
13mph |
SW 10mph knots
SW
10mph |
|
300m
|
300m | S 13mph knots
S
13mph |
S 16mph knots
S
16mph |
S 14mph knots
S
14mph |
SW 13mph knots
SW
13mph |
SW 9mph knots
SW
9mph |
SW 6mph knots
SW
6mph |
|
Valley
|
Valley | S 13mph knots
S
13mph |
S 16mph knots
S
16mph |
S 14mph knots
S
14mph |
SW 12mph knots
SW
12mph |
SW 9mph knots
SW
9mph |
SW 6mph knots
SW
6mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 30mph | 36mph | 35mph | 30mph | 22mph | 18mph |
|
600m
|
600m | 25mph | 27mph | 28mph | 25mph | 18mph | 14mph |
|
300m
|
300m | 22mph | 27mph | 25mph | 22mph | 16mph | 13mph |
|
Valley
|
Valley | 22mph | 26mph | 24mph | 21mph | 16mph | 13mph |
|
Time
|
Time |
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 | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
300m
|
300m | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 17 degrees Celsius 17°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2500m
|
2600m
|
2500m
|
2500m
|
2600m
|
2600m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C |
|
600m
|
600m | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2500m
|
2600m
|
2500m
|
2500m
|
2600m
|
2600m
|
Additional weather information
Meteorologist's view
Misty conditions at first, and fog patches during the evening are likely to give some difficult navigating conditions. There is a small risk of thunder and briefly gusty winds, accompanying the daytime showers. If the sun comes out in the afternoon UV levels are likely to be high.
Weather
Mostly cloudy with some drizzle and mist patches at first. Showery rain developing from the west during the morning. Some heavy bursts possible around the middle of the day, with the chance of thunder. Showers easing from mid-afternoon with some brighter breaks, then mostly dry in the evening with clear intervals, though some mist and fog patches also forming. Brisk south to southwesterly winds until the evening near the summits and heavy showers could give some brief gusty conditions elsewhere too during the day.
Chance of cloud-free hill tops
30% at first and as heavy showers develop during the morning/early afternoon. Increasing to around 70% mid to late afternoon, then dropping to 30% or less in the evening as cloud shrouds most summits.
Low cloud and visibility
Broken cloud bases around 600m with mist and drizzle giving some poor visibility at first especially near the summits. Moderate to poor visibility in heavy showers during the day, then improving moderate in brighter breaks later. Poor or very poor visibility in summit cloud during the evening.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Low cloud covering summits and some drizzle at first. Cloud lifting and breaking during the morning to give some bright or sunny spells, and dry throughout the afternoon. Rain arriving overnight, accompanied by cloud covering summits. Breezy near the summits, and winds generally strengthening overnight.
Chance of cloud-free hill tops
20% or less at first, increasing to 70% or more for a time in the afternoon, then lowering to 30% or less in the evening.
Maximum wind speed expected
West to northwest 15 to 20mph, gusts 20 to 25mph, turning south to southwest during the afternoon and for the evening and increasing to 35, occasionally 40mph, with gusts to around 45mph.
Temperature
- At 800m Plus 9 degrees Celsius rising to plus 12 degrees Celsius.
- Valley Plus 13 degrees Celsius rising to plus 20 degrees Celsius
- Freezing level Well-above summits throughout.
Low cloud and visibility
Low cloud giving fog patches and very poor visibility at first, especially on hills above about 400 metres. Visibility improving to moderate or good in afternoon sunshine, then deteriorating to poor in the evening, especially above 300 or 400 metres.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 2 Jul
Rain and brisk winds at first clearing to leave a mostly fine, but still breezy day with plenty of sunshine. Freezing levels above summits throughout.
Fri 3 Jul
Dry with early low cloud clearing to leave some sunshine. Breezy near the summits. Freezing levels above the summits throughout.
Sat 4 Jul
Mostly dry but fairly cloudy, and breezy near the summits. Freezing levels above the summits throughout.
Mountain weather information
Thu 2 Jul
Rain and brisk winds at first clearing to leave a mostly fine, but still breezy day with plenty of sunshine. Freezing levels above summits throughout.
Fri 3 Jul
Dry with early low cloud clearing to leave some sunshine. Breezy near the summits. Freezing levels above the summits throughout.
Sat 4 Jul
Mostly dry but fairly cloudy, and breezy near the summits. Freezing levels above the summits throughout.
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.