Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Medium confidence in details of the forecast however timing of clearance of mist and fog on Wednesday morning is more uncertain. Storm Éowyn expected on Friday so keep a close eye on the forecast to keep up to date with the latest information.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.
Mountain weather forecast
Early mist and fog clearing, then sunny spells and light winds. Cold.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
30% | 20% | 20% | 20% | 20% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
W
6
|
SW
5
|
SW
7
|
W
9
|
W
9
|
SW
12
|
| 600m |
S
5
|
S
5
|
SW
5
|
W
6
|
SW
6
|
SW
8
|
| 300m |
SE
3
|
SE
3
|
SW
3
|
W
4
|
SW
3
|
SW
4
|
| Valley |
SE
3
|
S
3
|
SW
3
|
W
4
|
SW
3
|
SW
5
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 8 | 7 | 9 | 12 | 12 | 14 |
| 600m | 6 | 7 | 7 | 9 | 8 | 11 |
| 300m | 4 | 5 | 5 | 7 | 5 | 9 |
| Valley | 4 | 6 | 6 | 7 | 5 | 10 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
0°
|
0°
|
-1°
|
-1°
|
| 600m |
2°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
4°
|
3°
|
4°
|
4°
|
3°
|
2°
|
| Valley |
4°
|
3°
|
5°
|
6°
|
4°
|
4°
|
| Freezing Level |
900m
|
900m
|
900m
|
800m
|
800m
|
800m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
-3°
|
-3°
|
-4°
|
-4°
|
-6°
|
-6°
|
| 600m |
0°
|
-1°
|
-1°
|
-1°
|
-2°
|
-3°
|
| 300m |
2°
|
2°
|
3°
|
2°
|
2°
|
0°
|
| Valley |
3°
|
2°
|
4°
|
4°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Cold temperatures today, especially on higher slopes, but light winds mean that severe wind chill is unlikely.
Weather
Any valley fog may take some time to clear this morning. Otherwise, some cloud and rain is possible at first in the southeast of the Park, wintry above around 700m, but a bright day developing for many with some sunny intervals. Possibly isolated showers in the northwest of the Park, again wintry above around 700m. Mist and fog likely to form again during the evening period.
Chance of cloud-free hill tops
60%.
Low cloud and visibility
Scattered or broken low cloud above 400m at the start of the day, mainly in the southeast at first, this will slowly lift and clear but periods of low cloud developing above 500-600m around northwestern hills. Clear summits and views are more likely in the afternoon for the south and eastern mountains. Visibility will be poor or very poor initially in fog and low cloud, but becoming good away from cloud for the main part of the day.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A dry start but with fog and low cloud re-developing overnight. Precipitation spreading east over the Park during Thursday morning, falling as sleet or snow on the higher summits. Precipitation clearing during the afternoon with showers following, wintry above 500m, then some clear spells developing later. Becoming windy.
Chance of cloud-free hill tops
60% becoming 20% during the morning, improving to 80% later.
Maximum wind speed expected
South or southwest 30-40 mph with gusts 45-55 mph from late morning.
Temperature
- At 800m Zero Celsius becoming Minus 1 Celsius later.
- Valley Zero Celsius rising to Plus 4 Celsius.
- Freezing level 800-1000m, decreasing 500m later.
Low cloud and visibility
Layers of broken cloud above 400m thickening during the morning. Visibility moderate to poor at times in rainfall at lower levels and very poor in fog and cloud or sleet and snow on the higher tops, accompanied by strong winds so blizzard conditions are a possibility on the highest tops. Visibility becoming mostly good as rain clears in the afternoon.
Mountain weather information
Fri 24 Jan
Sunrise:
Sunset:
Storm Éowyn will cross Wales with heavy rain at first. Severe gales expected, with storms likely on higher summits. A few brighter spells in the afternoon but gales only slowly easing. Freezing level briefly rising above summits, lowering to 500m later.
Sat 25 Jan
Sunrise:
Sunset:
Feeling cold but a bright day with some sunny spells, mixed with wintry showers. Southwesterly winds easing, then southerly winds strengthening again later. Freezing level around 600m.
Sun 26 Jan
Sunrise:
Sunset:
Early wintry showers easing, but another spell of heavy rain arriving. Southeasterly wind increasing to become severe gale force again, perhaps near storm force on higher summits. Freezing level rising above summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
Key
Mountain summits
Other points of interest
Cluster of multiple stations
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.