Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Turning very cold towards the New Year, mainly dry until the 1st or the 2nd January when some wintry showers are expected with some snow accumulations likely. There will be strong north or northwesterly winds at times with a significant wind chill expected, full winter walking kit may be required.
This evening forecast
A dry and cold evening ahead with mist and fog forming in places, staying dry with light northeasterly winds.
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.
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
A dry and cold day, mist and fog in places in the morning but some sunshine developing, feeling very cold higher on the mountains in light northerly winds.
| 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) |
10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
E
16
|
E
15
|
E
21
|
E
20
|
E
16
|
E
19
|
E
27
|
E
33
|
| 600m |
E
13
|
E
12
|
E
17
|
E
13
|
E
13
|
E
13
|
E
14
|
E
14
|
| 300m |
E
8
|
E
6
|
E
11
|
E
10
|
E
9
|
E
8
|
E
6
|
E
5
|
| Valley |
E
8
|
E
6
|
E
11
|
E
9
|
E
9
|
E
8
|
E
6
|
E
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m | 21 | 21 | 28 | 26 | 20 | 24 | 35 | 42 |
| 600m | 17 | 17 | 25 | 21 | 18 | 19 | 21 | 20 |
| 300m | 16 | 13 | 21 | 19 | 16 | 16 | 14 | 12 |
| Valley | 16 | 12 | 21 | 18 | 15 | 15 | 14 | 11 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-1°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
0°
|
| 600m |
1°
|
0°
|
0°
|
0°
|
1°
|
1°
|
0°
|
1°
|
| 300m |
2°
|
2°
|
2°
|
2°
|
4°
|
3°
|
2°
|
3°
|
| Valley |
3°
|
3°
|
3°
|
3°
|
5°
|
4°
|
3°
|
4°
|
| Freezing Level |
500m
|
500m
|
500m
|
500m
|
600m
|
600m
|
500m
|
700m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-8°
|
-8°
|
-9°
|
-9°
|
-8°
|
-9°
|
-11°
|
-9°
|
| 600m |
-4°
|
-4°
|
-6°
|
-5°
|
-4°
|
-5°
|
-6°
|
-4°
|
| 300m |
-2°
|
-1°
|
-2°
|
-2°
|
0°
|
0°
|
-1°
|
1°
|
| Valley |
-1°
|
0°
|
-1°
|
0°
|
2°
|
2°
|
1°
|
2°
|
Additional weather information
Meteorologist's view
Feeling very chilly out walking on the mountains with a chill that will be enhanced by cold northeasterly winds.
Weather
Mist and fog forming overnight in prone spots and a frost developing too. Monday will start misty with some fog patches but low cloud will clear during the morning with sunny spells developing. Patchy cloud at times, leading in to a dry evening with mist and fog forming again.
Chance of cloud-free hill tops
80%, patchy or scattered amounts of cloud forming around the hills.
Low cloud and visibility
Generally all summits will be clear at times on Monday but patchy or scattered amounts of low cloud may affect the hill tops at times especially in the morning and the evening and this will be more likely in the east. Visibility will be moderate or poor in mist and very poor in any fog patches but away from these the visibility will be good with far reaching views available.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another very cold day with fresh northeasterly winds enhancing the cold feel. A dry and bright day with plenty of weak sunshine.
Chance of cloud-free hill tops
95%
Maximum wind speed expected
Northeasterly 15mph
Temperature
- At 800m Zero Celsius
- Valley Minus 1 rising to Plus 3 Celsius.
- Freezing level around 400m
Low cloud and visibility
Most cloud expected to be above the summits with very good visibility and great far reaching views.
Mountain weather information
Wed 31 Dec
Sunrise:
Sunset:
Another cold but dry and bright day to finish the year, strong northerly winds will make it feel bitterly cold, perhaps more cloud later in the day.
Thu 1 Jan
Sunrise:
Sunset:
Wintry showers are a possibility for the new year with more cloud than recent days and strong northwesterly winds expected, poor visibility in wintry showers and full winter conditions expected on the mountains.
Fri 2 Jan
Sunrise:
Sunset:
A continuation of the cold conditions that start the new year with fresh or strong north or northwesterly winds, some bright weather but risk of some 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.