Eryri / Snowdonia Mountain weather forecast table
Confidence
High for an unsettled couple of days. Moderate for a transition to more settled conditions over the weekend.
This evening forecast
Largely cloudy this evening, especially in the east of the park. Any early showers clearing, becoming dry.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Poor Visibility
Mountain weather forecast
Cloudy with outbreaks of heavy showery rain.
00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
||||||||
Chance of precipitation (at 800m) |
<05% | <05% | <05% | 20% | 40% | 60% | 60% | 40% |
00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|---|---|
900m |
E
12
|
E
10
|
E
8
|
NE
6
|
N
8
|
N
11
|
NW
8
|
NW
9
|
600m |
SE
9
|
SE
8
|
E
6
|
N
7
|
N
8
|
N
10
|
NW
7
|
NW
5
|
300m |
SE
7
|
SE
5
|
E
4
|
N
5
|
N
7
|
N
8
|
NW
4
|
NW
3
|
Valley |
SE
7
|
SE
6
|
SE
4
|
N
5
|
N
8
|
N
7
|
NW
4
|
W
4
|
00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|---|---|
900m | 14 | 12 | 11 | 9 | 12 | 16 | 11 | 13 |
600m | 12 | 10 | 8 | 10 | 13 | 14 | 10 | 8 |
300m | 11 | 9 | 6 | 9 | 11 | 13 | 8 | 7 |
Valley | 11 | 10 | 7 | 9 | 13 | 12 | 7 | 6 |
00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|---|---|
900m |
9°
|
8°
|
9°
|
10°
|
11°
|
11°
|
9°
|
9°
|
600m |
11°
|
10°
|
11°
|
12°
|
13°
|
13°
|
11°
|
10°
|
300m |
12°
|
12°
|
13°
|
15°
|
15°
|
15°
|
13°
|
12°
|
Valley |
13°
|
13°
|
14°
|
16°
|
16°
|
16°
|
14°
|
13°
|
Freezing Level |
2,000m
|
1,900m
|
1,900m
|
2,000m
|
2,100m
|
2,200m
|
2,300m
|
2,400m
|
00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|---|---|
900m |
6°
|
6°
|
7°
|
9°
|
10°
|
8°
|
7°
|
6°
|
600m |
9°
|
9°
|
10°
|
11°
|
12°
|
11°
|
10°
|
9°
|
300m |
11°
|
11°
|
12°
|
14°
|
14°
|
14°
|
13°
|
12°
|
Valley |
12°
|
12°
|
13°
|
15°
|
15°
|
15°
|
14°
|
12°
|
Additional weather information
Meteorologist's view
A good start to the day, sun protection advised. Waterproofs recommended in the afternoon.
Weather
A dry and clear early morning period. Sunny through the morning, gradually becoming cloudier. A chance of showers early afternoon, these perhaps heavy with a small risk of thunder. Becoming increasingly cloudy from the east later in the afternoon and evening with rain, which may turn heavy for a time. Cloud lowering again into the evening.
Chance of cloud-free hill tops
80% through the morning and afternoon, 40% later.
Low cloud and visibility
Some low cloud to the west of the park initially but soon clearing. Bases generally above summits by day, lowering from late afternoon associated with rainfall to 600-700m. Good visibility with clear views of distant hills, moderate in rain or showers, poor in cloud at elevation later.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy and murky start on Friday with low cloud covering hill tops and outbreaks of rain. Cloud lifting and breaking through the day, some brief brighter spells in the afternoon and the risk of an isolated heavy perhaps thundery shower.
Chance of cloud-free hill tops
20% initially, becoming 80% by mid-morning.
Maximum wind speed expected
Northerly 17 mph.
Temperature
- At 800m Plus 10 Celsius.
- Valley Plus 12 Celsius becoming 18 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud down to 300-400m initially, lifting and breaking through the morning, rising above summits. Visibility poor in cloud initially, becoming generally good at all elevations later with clear views of distant hills. Perhaps briefly moderate in isolated showers.
Mountain weather information
Sat 18 May
A brighter day but once again with a chance of heavy thundery showers. Freezing level above summits.
Sun 19 May
Partly cloudy, with sunny intervals, mostly dry. Freezing level above summits.
Mon 20 May
Bright initially, a chance of heavy thundery showers. Freezing level above summits.
Summit specific forecast
Mountain summit forecast map
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.