Mountain weather
Eryri / Snowdonia
Confidence
High for an increasingly settled day, lower for shower and rain details through the period.
-
This eveningSunrise:Sunset:
-
Thu 10 SepSunrise:Sunset:
-
Fri 11 SepSunrise:Sunset:
-
Further outlook
This evening forecast
Dry and bright to end the day with pleasant sunny spells.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Heavy Persistent Rain
Strong Sunlight
Mountain weather forecast
Dry to begin with rain and cloud approaching from the west 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 |
10%
|
10%
|
40%
|
60%
|
60%
|
60%
|
70%
|
40%
|
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 20mph knots
W
20mph |
W 17mph knots
W
17mph |
W 15mph knots
W
15mph |
NW 13mph knots
NW
13mph |
W 12mph knots
W
12mph |
W 11mph knots
W
11mph |
W 6mph knots
W
6mph |
SW 7mph knots
SW
7mph |
|
600m
|
600m | W 12mph knots
W
12mph |
W 11mph knots
W
11mph |
W 10mph knots
W
10mph |
NW 10mph knots
NW
10mph |
W 10mph knots
W
10mph |
W 10mph knots
W
10mph |
W 5mph knots
W
5mph |
SW 5mph knots
SW
5mph |
|
300m
|
300m | W 8mph knots
W
8mph |
W 7mph knots
W
7mph |
W 7mph knots
W
7mph |
NW 9mph knots
NW
9mph |
W 9mph knots
W
9mph |
W 9mph knots
W
9mph |
W 4mph knots
W
4mph |
SW 4mph knots
SW
4mph |
|
Valley
|
Valley | W 8mph knots
W
8mph |
W 7mph knots
W
7mph |
W 8mph knots
W
8mph |
NW 9mph knots
NW
9mph |
NW 9mph knots
NW
9mph |
NW 9mph knots
NW
9mph |
W 5mph knots
W
5mph |
S 5mph knots
S
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 26mph | 22mph | 20mph | 20mph | 19mph | 18mph | 10mph | 10mph |
|
600m
|
600m | 18mph | 15mph | 14mph | 16mph | 17mph | 17mph | 9mph | 8mph |
|
300m
|
300m | 17mph | 13mph | 13mph | 15mph | 17mph | 16mph | 8mph | 8mph |
|
Valley
|
Valley | 17mph | 14mph | 14mph | 16mph | 16mph | 17mph | 9mph | 9mph |
|
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 | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 5 degrees Celsius 5°C |
|
600m
|
600m | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 7 degrees Celsius 7°C |
|
300m
|
300m | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
|
Valley
|
Valley | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 15 degrees Celsius 15°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
2500m
|
2300m
|
2200m
|
2000m
|
1800m
|
1700m
|
1900m
|
2000m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 6 degrees Celsius 6°C | 5 degrees Celsius 5°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 | 3 degrees Celsius 3°C |
|
600m
|
600m | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C | 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 | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
2500m
|
2300m
|
2200m
|
2000m
|
1800m
|
1700m
|
1900m
|
2000m
|
Additional weather information
Meteorologist's view
A rather poor day for navigation through the national park as cloud and rain are set to spread in from the west which will make navigation on many routes difficult and also potentially slippery under foot. Waterproofs are also recommended for any outbreaks of rain.
Weather
A dry start but low cloud and outbreaks of rain will soon arrive from the west after dawn. This may turn heavy through the afternoon and into the evening. Moderate southwesterly winds.
Chance of cloud-free hill tops
40% dropping to 10% through early afternoon.
Low cloud and visibility
Cloud bases initially above summits but dropping to bases between 500-600m through the afternoon with patchy areas of cloud with bases between 300-400m. Visibilities initially very good but becoming poor or very poor in hill fog later and may widely dip to moderate or poor in persistent rain through the afternoon.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Patchy cloud around initially but this is expected to lift and break to leave plenty of dry and bright weather around the day. Light to moderate northwesterly winds.
Chance of cloud-free hill tops
60% rising to >95% through the morning.
Maximum wind speed expected
Northwesterly 15-20 mph.
Temperature
- At 800m plus 5 Celsius rising to plus 8 Celsius.
- Valley plus 11 Celsius rising to plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Generally cloud bases are expected to be above the summits. However from dawn and through the early morning some patchy cloud may briefly shroud summits temporarily. Generally very good or excellent visibilities, with views of distant peaks possible. However visibilities may drop to moderate or poor in any patchy cloud initially.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sat 12 Sep
Dry and bright initially with some low cloud and rain quickly arriving from the northwest.
Sun 13 Sep
Cloudy with some light rain or showers initially. But cloud lifting and breaking through the afternoon to leave a drier and brighter end to the day.
Mon 14 Sep
Cloudy with outbreaks of rain possible through out Monday.
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.