Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Cloudy conditions on Tuesday but uncertainty over the chance of cloud breaks developing. A stormy period of weather likely towards the end of the week, keep an eye on latest forecasts.
This evening forecast
A dull, damp evening with a lot of cloud shrouding the mountains and mist and fog forming in the valleys, fresh southwesterly winds.
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.
Blizzards
Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
Mountain weather forecast
Mostly cloudy with outbreaks of rain which will turn to sleet on the higher mountains, perhaps brighter and drier in the south and east.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
70% | 70% | 80% | 80% | 70% | 80% | 80% | 70% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
SW
23
|
SW
24
|
S
23
|
S
24
|
SW
23
|
SW
14
|
S
9
|
SE
6
|
| 600m |
S
16
|
S
16
|
S
16
|
S
16
|
S
15
|
S
12
|
S
8
|
S
6
|
| 300m |
S
10
|
S
11
|
S
11
|
S
11
|
S
10
|
S
8
|
S
5
|
S
4
|
| Valley |
S
11
|
S
12
|
S
12
|
S
12
|
S
11
|
S
9
|
S
6
|
S
4
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m | 28 | 29 | 28 | 29 | 28 | 19 | 11 | 8 |
| 600m | 20 | 21 | 20 | 21 | 21 | 16 | 11 | 8 |
| 300m | 17 | 18 | 18 | 19 | 18 | 14 | 9 | 6 |
| Valley | 18 | 20 | 20 | 20 | 19 | 15 | 10 | 7 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
1°
|
0°
|
0°
|
0°
|
0°
|
-1°
|
| 600m |
3°
|
3°
|
2°
|
2°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
5°
|
5°
|
4°
|
4°
|
4°
|
4°
|
3°
|
3°
|
| Valley |
6°
|
6°
|
6°
|
5°
|
5°
|
5°
|
5°
|
4°
|
| Freezing Level |
1,300m
|
1,300m
|
1,300m
|
1,200m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
-5°
|
-5°
|
-6°
|
-7°
|
-7°
|
-6°
|
-5°
|
-4°
|
| 600m |
-2°
|
-2°
|
-3°
|
-3°
|
-3°
|
-3°
|
-2°
|
-2°
|
| 300m |
1°
|
1°
|
1°
|
0°
|
0°
|
1°
|
1°
|
1°
|
| Valley |
3°
|
2°
|
2°
|
2°
|
2°
|
2°
|
2°
|
3°
|
Additional weather information
Meteorologist's view
Mostly fresh or strong south or southwesterly winds. Freezing level lowering later in the day so precipitation may turn wintry on higher mountains.
Weather
Mist and fog slow to clear in places. Outbreaks of drizzly rain and overcast cloud for much of the morning, tending to brighten a little further south and east where there could be a few brighter spells in the afternoon. Mountains further north and west will see the worst conditions.
Chance of cloud-free hill tops
20% most likely around southern hills in the afternoon.
Low cloud and visibility
Layers of overcast cloud above 300m for much of the day, further south and east cloud will be more scattered above 400m with some breaks possible further south in the afternoon. Prepare for cloudy conditions on the summits. Visibility below the cloud will be good but turning moderate in drizzly rain. Visibility will be very poor on the summits for much of the day and in fog early in the day.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy but some bright or sunny spells developing, risk of a few afternoon showers otherwise mainly dry, feeling chilly but light winds.
Chance of cloud-free hill tops
40% improving to 70% for a time.
Maximum wind speed expected
Southwesterly 10 mph
Temperature
- At 800m Zero Celsius
- Valley Zero Celsius rising to plus 6 Celsius.
- Freezing level 800m
Low cloud and visibility
Broken cloud layers above 500m will thin and lift for a time during the day, especially around northern fells, cloud patches lingers further south. Visibility will generally be good or very good, although perhaps moderate later.
Mountain weather information
Thu 23 Jan
Sunrise:
Sunset:
Feeling cold with freezing level around 800m some showers will turn wintry on the higher tops, some brighter spells away from showers but strong southwesterly winds in the afternoon.
Fri 24 Jan
Sunrise:
Sunset:
Wet conditions with gales likely, some sunny spells possible later in the day, Freezing level lifting above all summits.
Sat 25 Jan
Sunrise:
Sunset:
Southwesterly wind remaining fresh or strong but a lot of brighter weather, tuning colder again with a significant windchill likely.
Updated at:
Summit specific forecast
Mountain summit forecast map
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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.