Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Good confidence initially as colder spell continues. A potential for further snow accumulation on hills. Strong winds persist causing enhanced wind chill, but becoming slightly milder into the weekend. Lower confidence in details of the milder air arriving by the weekend. Keep an eye on the most up to date forecasts.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Heavy Persistent Snow
Heavy snow can lead to rapid changes in underfoot conditions and paths may become treacherous or hidden. It also brings very poor visibility and often makes navigation much more challenging. When deep snow accumulates progress is often time consuming and strenuous, significantly affecting the distance one can travel on foot. Deep drifts can develop if snow is combined with strong winds. A heightened avalanche risk is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Cold with occasionally wintry showers, but plenty of sunny spells.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | 10% | 30% | 30% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
N
31
|
N
31
|
N
28
|
N
31
|
N
30
|
N
29
|
| 600m |
N
20
|
N
19
|
N
20
|
N
20
|
N
19
|
N
18
|
| 300m |
N
13
|
N
12
|
N
14
|
N
15
|
N
12
|
N
13
|
| Valley |
N
13
|
N
13
|
N
15
|
N
16
|
N
12
|
N
13
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 37 | 37 | 34 | 38 | 38 | 36 |
| 600m | 25 | 25 | 27 | 27 | 26 | 27 |
| 300m | 22 | 23 | 24 | 27 | 23 | 25 |
| Valley | 22 | 24 | 25 | 27 | 23 | 25 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-4°
|
-3°
|
-2°
|
-3°
|
-3°
|
-2°
|
| 600m |
-1°
|
0°
|
0°
|
0°
|
0°
|
0°
|
| 300m |
1°
|
2°
|
3°
|
3°
|
2°
|
2°
|
| Valley |
2°
|
3°
|
5°
|
4°
|
4°
|
4°
|
| Freezing Level |
300m
|
200m
|
300m
|
400m
|
400m
|
400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-13°
|
-12°
|
-11°
|
-12°
|
-11°
|
-11°
|
| 600m |
-8°
|
-7°
|
-6°
|
-6°
|
-7°
|
-6°
|
| 300m |
-4°
|
-3°
|
-2°
|
-2°
|
-2°
|
-2°
|
| Valley |
-3°
|
-1°
|
0°
|
0°
|
0°
|
0°
|
Additional weather information
Meteorologist's view
A very cold day expected on the hills despite the sunshine, with a significant wind-chill factor at height. Caution to be taken as slopes may remain slippery for a time after wintry showers, or in ice.
Weather
A largely dry and sunny day, although occasional wintry showers remain possible, contributing further to snow accumulation on hills. Frost and ice developing under clear skies overnight as temperatures drop below zero. Temperatures remaining in the low single figures through the day, as a fresh northerly wind cause it to feel colder.
Chance of cloud-free hill tops
80%, with patchy cloud lowering in occasional wintry showers.
Low cloud and visibility
Generally very good or excellent visibility expected, but cloud may reducing 400-500m at times, with visibility temporarily reducing moderate or poor in snow showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Remaining cold in the northerly airflow, otherwise a dry and bright with plenty of sunny intervals through the day. Though turning increasingly cloudy from the west through the evening, as a band of rain and sleet pushes eastwards overnight.
Chance of cloud-free hill tops
Above 95%.
Maximum wind speed expected
Northerly 10-15mph with gusts 25-30mph, backing southwesterly through the afternoon.
Temperature
- At 800m Minus 4 Celsius rising to Plus 2 Celsius.
- Valley Minus 2 Celsius rising to Plus 4 Celsius.
- Freezing level Generally above 600m, but lifting to 900m through the evening.
Low cloud and visibility
Little cloud cover, with excellent visibility allowing far reaching views.
Mountain weather information
Sat 22 Nov
Sunrise:
Sunset:
Less cold than recently with rain to start the morning but easing into the afternoon with cloud breaks developing for a time. Strong south to southwest winds. Freezing level above the summits.
Sun 23 Nov
Sunrise:
Sunset:
Low cloud and outbreaks of rain overnight soon followed by frequent showers, some heavy. Strong to gale force winds. Freezing level just above summits.
Mon 24 Nov
Sunrise:
Sunset:
Low confidence, but likely remaining unsettled and often cloudy with outbreaks of rain or showers. Perhaps a chance of some summit snow. Freezing level close to summit level.
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.