Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for unsettled weather with rain at times to continue for the next few day, although lower for rainfall details. High for a change to colder weather during Friday.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
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.
Mountain weather forecast
Cloudy and wet.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
80% | 80% | 80% | 80% | 80% | 60% |
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
26
|
SE
25
|
SE
16
|
SE
18
|
S
18
|
| 600m |
SE
16
|
SE
14
|
SE
19
|
SE
12
|
SE
13
|
S
13
|
| 300m |
SE
12
|
SE
9
|
SE
12
|
SE
7
|
SE
9
|
SE
8
|
| Valley |
SE
12
|
SE
9
|
SE
12
|
SE
7
|
SE
9
|
S
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 28 | 31 | 30 | 20 | 22 | 21 |
| 600m | 22 | 19 | 24 | 16 | 18 | 17 |
| 300m | 22 | 17 | 20 | 13 | 17 | 15 |
| Valley | 22 | 17 | 20 | 13 | 17 | 15 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
3°
|
3°
|
4°
|
4°
|
4°
|
| 600m |
5°
|
5°
|
5°
|
6°
|
6°
|
6°
|
| 300m |
6°
|
6°
|
7°
|
8°
|
8°
|
8°
|
| Valley |
7°
|
8°
|
9°
|
9°
|
9°
|
9°
|
| Freezing Level |
1,600m
|
1,500m
|
1,500m
|
1,600m
|
1,700m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-3°
|
-1°
|
-1°
|
-1°
|
| 600m |
0°
|
0°
|
0°
|
2°
|
2°
|
2°
|
| 300m |
3°
|
4°
|
4°
|
6°
|
5°
|
5°
|
| Valley |
4°
|
5°
|
6°
|
7°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
The combination of low cloud and the risk of some persistent rain and drizzle will bring a significantly colder feel at height despite the generally mild temperatures and moderate winds. Periods of poor visibility likely at height through the day, care needed with navigation.
Weather
A cloudy, grey day with outbreaks of rain on and off throughout. Initial light rain and drizzle will become persistent and heavy for a time into the late afternoon, before this generally clears to leave some drier spells into the evening.
Chance of cloud-free hill tops
10%, best chance across the far west
Low cloud and visibility
Widely poor in extensive cloud down to 300 to 600 metres, although this locally more broken up across the far west of the Park in the lee of some of the higher ground.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Some persistent rain at first. Then the rest of the day will be mostly cloudy with a few showers, but some drier spells of weather in the afternoon, especially across the east of the region.
Chance of cloud-free hill tops
30%.
Maximum wind speed expected
Southwesterly average speeds of 30 mph with gusts to 50 mph on the higher tops in the morning.
Temperature
- At 800m Plus 4 Celsius
- Valley Plus 4 rising to 9 Celsius
- Freezing level Above the summits
Low cloud and visibility
Poor in areas of cloud down to 600 to 900 metres, lowest bases across the west of the Park.
Mountain weather information
Thu 12 Feb
Sunrise:
Sunset:
Remaining unsettled with further showery rain, this may turn to snow on the higher tops later in the day but low confidence in this aspect.
Fri 13 Feb
Sunrise:
Sunset:
Cloudy with rain, this likely to fall as sleet and snow on the hills before it clears from the north during the day. Cold, strong northeasterly winds.
Sat 14 Feb
Sunrise:
Sunset:
A ridge of high pressure will bring a cold, dry and bright day with light winds.
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.