Mountain weather
Eryri / Snowdonia
Confidence
High for continued changeable conditions. Low with respect to shower distribution and intensity.
-
This eveningSunrise:Sunset:
-
Wed 16 SepSunrise:Sunset:
-
Thu 17 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Feeling fresher with a few showers.
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
Sunshine and showers in the morning. Rain arriving by evening.
|
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 |
30%
|
30%
|
60%
|
60%
|
60%
|
50%
|
70%
|
70%
|
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 32mph knots
SW
32mph |
W 30mph knots
W
30mph |
W 25mph knots
W
25mph |
W 23mph knots
W
23mph |
W 24mph knots
W
24mph |
W 23mph knots
W
23mph |
W 20mph knots
W
20mph |
W 21mph knots
W
21mph |
|
600m
|
600m | SW 22mph knots
SW
22mph |
W 22mph knots
W
22mph |
W 16mph knots
W
16mph |
W 18mph knots
W
18mph |
W 19mph knots
W
19mph |
W 18mph knots
W
18mph |
W 14mph knots
W
14mph |
W 15mph knots
W
15mph |
|
300m
|
300m | SW 14mph knots
SW
14mph |
W 15mph knots
W
15mph |
W 10mph knots
W
10mph |
W 14mph knots
W
14mph |
W 16mph knots
W
16mph |
W 16mph knots
W
16mph |
W 13mph knots
W
13mph |
W 13mph knots
W
13mph |
|
Valley
|
Valley | SW 13mph knots
SW
13mph |
W 14mph knots
W
14mph |
W 10mph knots
W
10mph |
W 14mph knots
W
14mph |
W 16mph knots
W
16mph |
W 16mph knots
W
16mph |
W 13mph knots
W
13mph |
W 13mph knots
W
13mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 41mph | 39mph | 32mph | 32mph | 35mph | 36mph | 31mph | 31mph |
|
600m
|
600m | 30mph | 30mph | 23mph | 26mph | 30mph | 31mph | 25mph | 25mph |
|
300m
|
300m | 28mph | 28mph | 21mph | 25mph | 29mph | 29mph | 23mph | 23mph |
|
Valley
|
Valley | 26mph | 27mph | 21mph | 24mph | 28mph | 28mph | 23mph | 23mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
600m
|
600m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
|
300m
|
300m | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 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 |
| Freezing Level | Freezing Level |
2800m
|
2100m
|
1600m
|
1700m
|
1800m
|
1800m
|
1800m
|
1700m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C |
|
600m
|
600m | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
2800m
|
2100m
|
1600m
|
1700m
|
1800m
|
1800m
|
1800m
|
1700m
|
Additional weather information
Meteorologist's view
Showers in the morning with brief drops in visibility. Drier by the afternoon and feeling less humid compared to recent days. UV levels moderate to high still.
Weather
Showers, mostly through the morning before easing with variable cloud by the afternoon and the odd shower. Sunshine turning hazier from the west with outbreaks of rain arriving into the evening and through the night.
Chance of cloud-free hill tops
80% rising to 95% by mid-afternoon.
Low cloud and visibility
Patchy cloud initially between 600-800m, this will temporarily shroud the highest peaks temporarily. Generally, very good or excellent visibilities but may drop to poor or very poor temporarily in patchy low cloud. Moderate visibilities in any passing showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Damp through the early hours with rain clearing by mid-morning. Sunny spells following behind with the odd shower possible. Clear skies into the night.
Chance of cloud-free hill tops
40% soon rising to 90% by mid-morning.
Maximum wind speed expected
Westerly 15-20 mph gusting 25 mph.
Temperature
- At 800m Plus 5 Celsius rising to plus 7 Celsius.
- Valley Plus 13 Celsius rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low cloud initially with bases around 400-600 m but soon clearing to leave cloud largely above summits. Poor visibilities then rising to excellent in clear airmass.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 18 Sep
Fresh start with sunny spells. Cloud increasing with outbreaks of rain arriving later. Moderate fo brisk southwesterly winds.
Sat 19 Sep
Low cloud and sporadic rain. Moderate westerly winds.
Sun 20 Sep
Staying dull with patchy rain and drizzle. Lighter 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.