Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for Friday. Low for extent of any showers over the weekend and early next week.
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
Early wintry showers, otherwise dry and cold.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
30% | 20% | 10% | 10% | 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 |
S
27
|
S
29
|
S
30
|
S
30
|
SE
33
|
SE
31
|
| 600m |
S
18
|
S
20
|
S
22
|
S
22
|
SE
22
|
SE
22
|
| 300m |
S
11
|
S
13
|
S
15
|
S
15
|
SE
14
|
SE
14
|
| Valley |
S
11
|
S
13
|
S
15
|
SE
14
|
SE
15
|
SE
14
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 32 | 34 | 36 | 37 | 40 | 38 |
| 600m | 23 | 27 | 28 | 29 | 30 | 30 |
| 300m | 21 | 25 | 26 | 25 | 27 | 27 |
| Valley | 21 | 25 | 26 | 25 | 27 | 27 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
1°
|
1°
|
1°
|
0°
|
| 600m |
2°
|
2°
|
3°
|
4°
|
3°
|
3°
|
| 300m |
4°
|
4°
|
5°
|
6°
|
5°
|
5°
|
| Valley |
5°
|
5°
|
7°
|
8°
|
6°
|
6°
|
| Freezing Level |
900m
|
900m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-7°
|
-8°
|
-7°
|
-6°
|
-7°
|
-7°
|
| 600m |
-4°
|
-4°
|
-3°
|
-2°
|
-3°
|
-3°
|
| 300m |
0°
|
0°
|
1°
|
2°
|
1°
|
0°
|
| Valley |
1°
|
1°
|
3°
|
4°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
Strengthening summit winds developing from late afternoon onwards.
Weather
Misty with valley fog in east at first. Frost most probable in west. Clouding over with showers until mid-morning, these falling as sleet and wet snow above 800 metres. Then the rest of the day will be mostly dry with variable cloud cover, and some bright or sunny spells.
Chance of cloud-free hill tops
60%.
Low cloud and visibility
Scattered bases 700 metres as showers pass by, otherwise only small amounts of summit cloud with good visibility.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Rather cloudy at times with passing showers, these most likely first thing in the morning with snow above 900 metres. More in the way of brighter skies and fewer showers in the afternoon.
Chance of cloud-free hill tops
50%, best chance in the afternoon across the north of the Park.
Maximum wind speed expected
South-easterly with summit gusts reaching 30-35mph.
Temperature
- At 800m Plus 1 Celsius.
- Valley Plus 3 rising to 7 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Poor in areas of cloud down to 700 metres as showers pass by, otherwise good visibility with patchy cloud above 800 metres.
Mountain weather information
Sun 18 Jan
Sunrise:
Sunset:
Mainly dry with variable amounts of cloud.
Mon 19 Jan
Sunrise:
Sunset:
Some drier spells of weather and a chance of showers, wintry on the higher tops.
Tue 20 Jan
Sunrise:
Sunset:
Little change, still a chance of showers but spells of dry weather too.
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.