Mountain weather
Eryri / Snowdonia
Confidence
High overall then uncertainty in frontal progression from Saturday night.
-
This eveningSunrise:Sunset:
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Sat 16 MaySunrise:Sunset:
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Sun 17 MaySunrise:Sunset:
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Further outlook
This evening forecast
The odd light shower remaining but largely turning dry this evening with skies clearing. Chilly with some patchy frost.
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
A dry and bright start but clouding over with rain later.
|
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 |
20%
|
20%
|
20%
|
20%
|
70%
|
80%
|
90%
|
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 | W 12mph knots
W
12mph |
W 10mph knots
W
10mph |
SW 10mph knots
SW
10mph |
SW 12mph knots
SW
12mph |
SW 13mph knots
SW
13mph |
SW 16mph knots
SW
16mph |
SW 20mph knots
SW
20mph |
W 20mph knots
W
20mph |
|
600m
|
600m | SW 7mph knots
SW
7mph |
SW 7mph knots
SW
7mph |
SW 8mph knots
SW
8mph |
SW 10mph knots
SW
10mph |
SW 12mph knots
SW
12mph |
SW 14mph knots
SW
14mph |
SW 15mph knots
SW
15mph |
W 12mph knots
W
12mph |
|
300m
|
300m | W 2mph knots
W
2mph |
SW 3mph knots
SW
3mph |
S 3mph knots
S
3mph |
SW 7mph knots
SW
7mph |
SW 8mph knots
SW
8mph |
SW 9mph knots
SW
9mph |
SW 10mph knots
SW
10mph |
W 7mph knots
W
7mph |
|
Valley
|
Valley | W 2mph knots
W
2mph |
SW 3mph knots
SW
3mph |
S 3mph knots
S
3mph |
SW 7mph knots
SW
7mph |
SW 8mph knots
SW
8mph |
SW 8mph knots
SW
8mph |
SW 9mph knots
SW
9mph |
W 7mph knots
W
7mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 14mph | 12mph | 13mph | 16mph | 18mph | 21mph | 26mph | 26mph |
|
600m
|
600m | 9mph | 9mph | 10mph | 13mph | 16mph | 19mph | 20mph | 17mph |
|
300m
|
300m | 5mph | 5mph | 6mph | 11mph | 14mph | 16mph | 18mph | 15mph |
|
Valley
|
Valley | 6mph | 5mph | 7mph | 11mph | 13mph | 14mph | 16mph | 15mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C |
|
600m
|
600m | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1000m
|
1100m
|
1400m
|
1600m
|
1600m
|
1500m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | -4 degrees Celsius -4°C | -4 degrees Celsius -4°C | -3 degrees Celsius -3°C | -3 degrees Celsius -3°C | -1 degrees Celsius -1°C | -1 degrees Celsius -1°C | -1 degrees Celsius -1°C | -2 degrees Celsius -2°C |
|
600m
|
600m | 0 degrees Celsius 0°C | 0 degrees Celsius 0°C | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C | 2 degrees Celsius 2°C |
|
300m
|
300m | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1000m
|
1100m
|
1400m
|
1600m
|
1600m
|
1500m
|
Additional weather information
Meteorologist's view
Rainfall combined with low cloud are expected to reduce visibility on exposed terrain, with saturated surfaces increasing the risk of slips and difficult footing.
Weather
A chilly but bright start. Soon clouding over from the west during the morning with light, patchy outbreaks of rain. Rain may turn heavy during the evening.
Chance of cloud-free hill tops
60% until midday, dropping to 20%
Low cloud and visibility
Cloud tops dropping from midday to around 400-500m alongside patchy rain. Good visibility to start but becoming moderate to poor in low cloud and rain.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rain clearing overnight to a mostly dry morning. Clouding over during the afternoon with scattered. These could turn heavy. Rain becoming more persistent into the evening.
Chance of cloud-free hill tops
80% lowering to 40%
Maximum wind speed expected
Westerly, 15 mph
Temperature
- At 800m Plus 6 Celsius rising to plus 11 Celsius.
- Valley Plus 4 Celsius rising to plus 14 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases lowering through the afternoon as more persistent spells of rain push in from the west. Visibility generally good but dropping to poor in low cloud and spells of rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 18 May
Spells of rain and showers. This heavy at times. Moderate southwesterly winds.
Tue 19 May
Another unsettled day with heavy rain and showers. Strong southwesterly winds.
Wed 20 May
Drier and brighter. Low risk of the odd shower. 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.