Eryri / Snowdonia Mountain weather forecast table
Confidence
Medium
This evening forecast
Heavy snow and blizzard conditions.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Poor Visibility
Blizzards
Heavy Persistent Snow
Gales
Mountain weather forecast
Mostly cloudy with snow showers.
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
80% | 80% | 70% | 60% | 50% | 50% | 50% | 40% |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
N
38
|
N
36
|
N
35
|
N
31
|
NW
27
|
NW
25
|
NW
24
|
NW
22
|
| 600m |
N
27
|
N
24
|
N
22
|
N
20
|
NW
17
|
NW
15
|
N
15
|
NW
12
|
| 300m |
N
18
|
N
15
|
N
14
|
N
12
|
NW
10
|
NW
9
|
N
9
|
NW
7
|
| Valley |
N
18
|
N
16
|
N
14
|
N
12
|
NW
10
|
NW
9
|
N
10
|
NW
7
|
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m | 46 | 44 | 42 | 38 | 33 | 30 | 30 | 26 |
| 600m | 34 | 30 | 28 | 26 | 22 | 20 | 20 | 16 |
| 300m | 29 | 28 | 26 | 23 | 19 | 17 | 18 | 14 |
| Valley | 29 | 28 | 27 | 24 | 20 | 18 | 18 | 15 |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
| 600m |
0°
|
0°
|
0°
|
0°
|
0°
|
0°
|
0°
|
-1°
|
| 300m |
1°
|
1°
|
2°
|
2°
|
2°
|
2°
|
1°
|
1°
|
| Valley |
2°
|
3°
|
3°
|
3°
|
3°
|
3°
|
2°
|
2°
|
| Freezing Level |
300m
|
500m
|
500m
|
600m
|
600m
|
500m
|
500m
|
500m
|
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-12°
|
-11°
|
-11°
|
-11°
|
-10°
|
-10°
|
-10°
|
-10°
|
| 600m |
-8°
|
-8°
|
-7°
|
-7°
|
-6°
|
-6°
|
-6°
|
-6°
|
| 300m |
-5°
|
-4°
|
-4°
|
-3°
|
-2°
|
-2°
|
-3°
|
-3°
|
| Valley |
-3°
|
-2°
|
-2°
|
-1°
|
-1°
|
-1°
|
-1°
|
-1°
|
Additional weather information
Meteorologist's view
Nothing further to add.
Weather
Heavy snow overnight with blizzard conditions at times. It will be rather cloudy during the day with snow showers, temporary blizzard conditions possible. A few drier and brighter spell developing during the day and the showers often or rain or sleet low down. Cold with severe wind chill.
Chance of cloud-free hill tops
10% becoming 30% in the afternoon.
Low cloud and visibility
Extensive low cloud, base 600m or less, occasionally scattered towards the summits during the afternoon and evening. Visibility moderate to very poor in cloud and snow, occasionally good at times in the afternoon and evening.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Becoming clear and frosty overnight, perhaps a few freezing fog patches in the valleys. Snow showers pushing in from the west later in the night and during the morning, before dying out in the afternoon and turning to rain at lower levels.
Chance of cloud-free hill tops
30% during the morning, later 50%
Maximum wind speed expected
South or Southwest 20mph gusting 30mph with a significant wind chill.
Temperature
- At 800m Minus 1 to Minus 3 Celsius
- Valley Minus 2 rising to Plus 3 during the day.
- Freezing level All levels, rising to around 600m during the day.
Low cloud and visibility
Becoming extensive, base 600m or less during the morning, lifting and breaking towards the summits during the afternoon. Visibility moderate to very poor in cloud, rain and snow, but good at times early and later in the period.
Mountain weather information
Sun 11 Jan
A transition to much milder conditions, although a period of heavy snow possible at height along with blizzard condition before turning to outbreaks of heavy rain at all level. Gale or severe gale force southerly winds at time. Freeing level rising above the summits after a cold start.
Mon 12 Jan
Cloudy or bright with occasional rain. Strong to gale force southwest winds at height.
Tue 13 Jan
Cloudy with outbreaks of rain. Strong to gale force southwest winds at height.
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.