Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for cold conditions and snow showers continuing over the weekend with a cold Arctic air mass over the United Kingdom. Temperatures at low levels are unlikely to rise above zero.
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.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Scattered snow showers and some sunny spells but feeling extremely cold with fresh north-westerly winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
40% | 40% | 40% | 40% | 20% | 20% |
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
39
|
N
41
|
N
40
|
N
35
|
N
34
|
N
30
|
| 600m |
NW
20
|
NW
21
|
N
27
|
N
23
|
N
20
|
N
18
|
| 300m |
NW
12
|
NW
13
|
N
18
|
N
15
|
N
13
|
N
12
|
| Valley |
NW
13
|
NW
13
|
N
19
|
N
16
|
N
14
|
N
12
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 45 | 48 | 47 | 42 | 41 | 36 |
| 600m | 26 | 26 | 34 | 30 | 28 | 25 |
| 300m | 25 | 25 | 31 | 27 | 27 | 23 |
| Valley | 25 | 26 | 31 | 28 | 28 | 24 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-4°
|
-4°
|
-5°
|
-5°
|
| 600m |
-2°
|
-2°
|
-1°
|
-2°
|
-2°
|
-2°
|
| 300m |
0°
|
0°
|
2°
|
1°
|
0°
|
0°
|
| Valley |
1°
|
2°
|
3°
|
2°
|
2°
|
1°
|
| Freezing Level |
0m
|
0m
|
100m
|
0m
|
0m
|
0m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-15°
|
-15°
|
-15°
|
-14°
|
-15°
|
-14°
|
| 600m |
-9°
|
-10°
|
-10°
|
-9°
|
-9°
|
-9°
|
| 300m |
-6°
|
-5°
|
-4°
|
-4°
|
-5°
|
-5°
|
| Valley |
-4°
|
-3°
|
-2°
|
-3°
|
-4°
|
-3°
|
Additional weather information
Meteorologist's view
Very cold conditions with freezing conditions at all levels and ice in places, extra care should be taken for icy conditions. Strong winds at higher levels will enhance the cold feel and it will be hard to stay warm. Gale force gusts likely near the summit of Snowdon at times.
Weather
Scattered snow showers during the day, most frequently affecting the north and west of the Park. Snow falling to all levels, perhaps with some localised hail. Outside of showers there will be good spells of winter sunshine. Feeling extremely cold though with fresh north-westerly winds enhancing the severe wind-chill.
Chance of cloud-free hill tops
60%, best chance in the south and east of the Park.
Low cloud and visibility
Patchy or scattered cloud lowering and thickening with bases around 600-800m around wintry showers especially around northern and western slopes. Visibility generally excellent, but temporarily poor or very poor and disorientating in snow showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Further snow showers are expected with some bright or sunny intervals. Snow perhaps becoming more widespread into the evening. Fresh north-westerly winds will enhance the cold feel and with such cold temperatures ice should be expected on untreated surfaces.
Chance of cloud-free hill tops
60%.
Maximum wind speed expected
Northwest 30-35mph.
Temperature
- At 800m Minus 5 Celsius
- Valley Minus 1 Celsius.
- Freezing level Surface level
Low cloud and visibility
Scattered low cloud forming above 600m in wintry showers with visibility falling poor or very poor in any heavier snow showers passing through. Away from showers it will be very good or excellent visibility. The best chance of brighter conditions is around mountain further south and east.
Mountain weather information
Mon 5 Jan
Sunrise:
Sunset:
Cold conditions continuing with scattered snow showers and sunny spells. Fresh north-westerly winds. Poor visibility is likely in showers and an ice risk is expected in cold temperatures
Tue 6 Jan
Sunrise:
Sunset:
Winds likely to come round to the west with a risk of snow and poor visibility in cloudier conditions, remaining cold with freezing level 400m or less.
Wed 7 Jan
Sunrise:
Sunset:
Details uncertain but remaining cold with more cloud and increasing risk of wintry showers.
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.