Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue over the weekend and into next week. Low confidence for detail of rainfall on a daily basis.
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
Cold and mainly dry.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 10% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SE
24
|
SE
21
|
SE
20
|
SE
20
|
SE
22
|
SE
21
|
| 600m |
SE
17
|
SE
16
|
SE
15
|
SE
15
|
SE
14
|
SE
15
|
| 300m |
SE
10
|
SE
10
|
SE
10
|
SE
9
|
SE
9
|
SE
9
|
| Valley |
SE
10
|
SE
10
|
SE
10
|
SE
10
|
SE
9
|
SE
10
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 28 | 26 | 25 | 25 | 26 | 25 |
| 600m | 22 | 21 | 20 | 19 | 20 | 19 |
| 300m | 20 | 20 | 17 | 17 | 17 | 18 |
| Valley | 20 | 20 | 17 | 17 | 18 | 19 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
1°
|
1°
|
1°
|
1°
|
| 600m |
3°
|
3°
|
4°
|
4°
|
3°
|
3°
|
| 300m |
5°
|
4°
|
6°
|
6°
|
5°
|
4°
|
| Valley |
6°
|
5°
|
7°
|
8°
|
6°
|
5°
|
| Freezing Level |
1,000m
|
1,000m
|
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 |
-6°
|
-6°
|
-5°
|
-5°
|
-6°
|
-6°
|
| 600m |
-2°
|
-2°
|
-1°
|
-1°
|
-1°
|
-1°
|
| 300m |
1°
|
1°
|
3°
|
4°
|
2°
|
1°
|
| Valley |
2°
|
2°
|
4°
|
5°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Strong winds over the highest summits will lead to slow progress and a significant wind chill.
Weather
Largely dry with variable cloud cover, although there is a small chance of an isolated shower, mainly this morning.
Chance of cloud-free hill tops
40% increasing 70%
Low cloud and visibility
Generally very good visibility with some areas of cloud around 500-600 metres at first this morning, becoming patchy cloud around 700 metres.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry overnight with increasing amounts of cloud, some of this low level cloud spreading in from the east. From late morning and through the rest of the day there is a chance of outbreaks of rain arriving at times, with summit sleet or snow, these most likely across eastern areas. Cold southeasterly summit winds.
Chance of cloud-free hill tops
Possibly decreasing 30% across eastern areas at times, otherwise 70%.
Maximum wind speed expected
Southeasterly 20 mph gusting 30mph.
Temperature
- At 800m Plus 1 to 3 Celsius
- Valley Minus 1 rising to 7 Celsius
- Freezing level Above summits
Low cloud and visibility
Poor in areas of cloud between 200 and 500 metres, mainly across eastern areas, this tending to clear through the morning. Cloud may become more extensive down to 600 metres should rain arrive from the east through the day, again most likely across eastern areas.
Mountain weather information
Mon 19 Jan
Sunrise:
Sunset:
Currently a largely dry day is expected but this may change with rain potentially arriving from the west at times. Light winds.
Tue 20 Jan
Sunrise:
Sunset:
Currently a largely dry morning is expected, but with spells of rain likely to spread east through the afternoon and evening. Strengthening southeast winds, with strong winds or gales probably developing.
Wed 21 Jan
Sunrise:
Sunset:
Remaining windy with the chance of further spells of rain.
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.