Mountain weather
Eryri / Snowdonia
Confidence
Generally high for the overall evolution, but medium for the detail regards to rainfall and cloud on Sunday.
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This eveningSunrise:Sunset:
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Sun 13 SepSunrise:Sunset:
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Mon 14 SepSunrise:Sunset:
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Further outlook
This evening forecast
Overcast with outbreaks of heavy rain across the park.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Severe Chill Effect
Heavy Persistent Rain
Mountain weather forecast
Outbreaks of rain easing during the afternoon.
|
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 |
70%
|
60%
|
50%
|
40%
|
<5%
|
20%
|
20%
|
20%
|
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 20mph knots
SW
20mph |
SW 22mph knots
SW
22mph |
SW 21mph knots
SW
21mph |
SW 23mph knots
SW
23mph |
SW 27mph knots
SW
27mph |
SW 29mph knots
SW
29mph |
SW 28mph knots
SW
28mph |
SW 30mph knots
SW
30mph |
|
600m
|
600m | SW 14mph knots
SW
14mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 18mph knots
SW
18mph |
SW 20mph knots
SW
20mph |
SW 20mph knots
SW
20mph |
SW 21mph knots
SW
21mph |
SW 22mph knots
SW
22mph |
|
300m
|
300m | S 9mph knots
S
9mph |
SW 9mph knots
SW
9mph |
SW 10mph knots
SW
10mph |
SW 12mph knots
SW
12mph |
SW 16mph knots
SW
16mph |
SW 16mph knots
SW
16mph |
SW 18mph knots
SW
18mph |
SW 19mph knots
SW
19mph |
|
Valley
|
Valley | S 9mph knots
S
9mph |
SW 8mph knots
SW
8mph |
SW 8mph knots
SW
8mph |
SW 11mph knots
SW
11mph |
SW 15mph knots
SW
15mph |
SW 15mph knots
SW
15mph |
SW 17mph knots
SW
17mph |
SW 16mph knots
SW
16mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 25mph | 28mph | 29mph | 32mph | 38mph | 41mph | 43mph | 46mph |
|
600m
|
600m | 19mph | 21mph | 23mph | 27mph | 31mph | 32mph | 36mph | 38mph |
|
300m
|
300m | 17mph | 17mph | 18mph | 22mph | 27mph | 29mph | 33mph | 35mph |
|
Valley
|
Valley | 16mph | 16mph | 15mph | 20mph | 25mph | 28mph | 31mph | 30mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C |
|
600m
|
600m | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 17 degrees Celsius 17°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C | 18 degrees Celsius 18°C |
| Freezing Level | Freezing Level |
2800m
|
3800m
|
3300m
|
3200m
|
3700m
|
3400m
|
3400m
|
3300m
|
|
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 | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C |
|
600m
|
600m | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
|
300m
|
300m | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 16 degrees Celsius 16°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C |
| Freezing Level | Freezing Level |
2800m
|
3800m
|
3300m
|
3200m
|
3700m
|
3400m
|
3400m
|
3300m
|
Additional weather information
Meteorologist's view
Low cloud and poor visibilities make navigation challenging, combined with wet surfaces and rain, suitable clothing is a necessity.
Weather
A wet start with outbreaks of heavy rain. This becoming patchier and lighter through the morning and into the afternoon but remaining largely cloudy through the day. Perhaps with some brighter spells developing later in the day. Winds also easing.
Chance of cloud-free hill tops
20% throughout the day.
Low cloud and visibility
Extensive low cloud around 500-600 m but cloud bases lowering towards 400 m in the heaviest rain. Generally poor to very poor visibility in rain and low cloud, but good outside of low cloud.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Often cloudy with showery outbreaks of rain affecting the park throughout the day. Skies breaking a little with some bright or sunny spells developing.
Chance of cloud-free hill tops
20% rising to 40% during the afternoon
Maximum wind speed expected
Southwesterly 15-20mph, gusting 25 mph..
Temperature
- At 800m Plus 14 Celsius rising to plus 16 Celsius
- Valley Plus 19 Celsius rising to plus 23 Celsius
- Freezing level Above summits
Low cloud and visibility
Extensive low bases around 300-400 meters during the morning, however this lifting to 500-600 meters. Generally poor to very poor visibility in rain and low cloud, but good outside of low cloud.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Tue 15 Sep
Rain clearing to leave sunny spells. Feeling fresher. Fresh northwesterly.
Wed 16 Sep
Largely dry with sunny intervals. Moderate to fresh westerly.
Thu 17 Sep
Unsettled with a fresh northwesterly leading to sunny spells and showers, these locally heavy.
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.