Eryri / Snowdonia Mountain weather forecast table
Confidence
High for mainly dry weather with limited showers Tuesday, then generally more unsettled from Wednesday, but lowering for detail of intensity and timing of worst of the weather.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Mountain weather forecast
Any early rain clearing to sunny spells and isolated showers.
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
Weather (at 800m) |
||||||
Chance of precipitation (at 800m) |
30% | 10% | 10% | 20% | 30% | 60% |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
W
24
|
W
16
|
W
15
|
SW
11
|
S
10
|
SE
11
|
600m |
W
18
|
W
13
|
W
13
|
SW
9
|
S
7
|
SE
7
|
300m |
SW
11
|
SW
9
|
W
9
|
SW
6
|
S
4
|
SE
4
|
Valley |
W
11
|
SW
9
|
W
9
|
W
6
|
SE
4
|
SE
4
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m | 29 | 21 | 21 | 15 | 13 | 13 |
600m | 22 | 17 | 19 | 13 | 11 | 10 |
300m | 20 | 14 | 15 | 11 | 9 | 8 |
Valley | 20 | 15 | 15 | 10 | 8 | 8 |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
5°
|
4°
|
5°
|
4°
|
4°
|
4°
|
600m |
7°
|
6°
|
7°
|
7°
|
6°
|
6°
|
300m |
8°
|
8°
|
10°
|
10°
|
9°
|
8°
|
Valley |
10°
|
10°
|
11°
|
11°
|
10°
|
10°
|
Freezing Level |
1,500m
|
1,400m
|
1,400m
|
1,400m
|
1,300m
|
1,400m
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
-1°
|
-1°
|
0°
|
1°
|
1°
|
1°
|
600m |
2°
|
3°
|
4°
|
4°
|
4°
|
4°
|
300m |
6°
|
6°
|
8°
|
8°
|
8°
|
7°
|
Valley |
7°
|
8°
|
9°
|
10°
|
9°
|
9°
|
Additional weather information
Meteorologist's view
A largely fine day, once early cloud lifts, but always the risk of the odd shower. Despite mild temperatures at lower levels and relatively light winds, still feeling chilly on the tops.
Weather
Any early rain soon clearing. A day of isolated light showers and limited brighter spells then follows. Any sunshine turning rather hazy due to high cloud, however. Low cloud building through evening with rain reaching from the south before midnight.
Chance of cloud-free hill tops
40% at first, rising to 70% by the afternoon, falling to 20% after dark.
Low cloud and visibility
Cloud obscuring hills from above 600m during the morning, but lifting and breaking to be patchy above 900m by the afternoon. Low cloud returning from the southwest after dark, obscuring the odd hill above 600m, with some patches down to 400m. Outside of cloud mostly good visibility through the day, but becoming moderate during rain.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Overcast start to the day with rain at times, along with some heavier outbreaks. Erratically turning drier from the west from late morning and through the afternoon with the chance of some late brighter spells appearing.
Chance of cloud-free hill tops
10% becoming 30% by late afternoon
Maximum wind speed expected
Variable 15mph or less
Temperature
- At 800m Plus 4 Celsius
- Valley Plus 5 Celsius increasing to Plus 15 Celsius
- Freezing level Above summits
Low cloud and visibility
Extensive low cloud will obscure routes above 500m for much of the day. The odd patch possible down to 300m in the west during the morning. Perhaps the odd break across eastern hills by the afternoon. Outside of cloud, visibility moderate to poor in the early rain, but improving to be good as drier weather moves in.
Mountain weather information
Thu 21 Mar
Cloudy and windy, but mostly dry. Rain spreading south later in the day, turning persistent from across western hills, with southwesterly gales on summits. Freezing level above all peaks.
Fri 22 Mar
Sunshine and showers with blustery winds. Showers frequent and heavy at times, with a risk of hail, and also increasingly turning to snow above 700m. Freezing level lowering to 800m.
Sat 23 Mar
Another day of sunshine and showers, with strong blustery winds, and snow on summits. Freezing level initially around 600m, but rising to 1000m as showers merge to give more frequent rain around midday
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.