Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for cold conditions over the next few days but lower confidence for Wednesday for the location of an area of sleet or snow pushing in from the southwest. High for milder Atlantic air arriving Friday.
This evening forecast
Cloudy with a few wintry showers but becoming drier later with clear spells developing. Strong northwest winds and severe wind chill. Freezing level 800m falling to 300m.
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.
Mountain weather forecast
Dry and mostly cloudy. Strong winds easing. Cold.
| 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) |
20% | 20% | 20% | 00% | 00% | 00% | 00% | 00% |
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 |
NW
32
|
NW
31
|
NW
24
|
N
18
|
NE
10
|
E
9
|
E
19
|
E
31
|
| 600m |
NW
19
|
NW
17
|
NW
13
|
N
8
|
NE
9
|
E
7
|
E
10
|
E
14
|
| 300m |
NW
12
|
NW
10
|
NW
8
|
NW
4
|
NE
7
|
NE
6
|
E
8
|
SE
10
|
| Valley |
NW
12
|
NW
10
|
NW
8
|
NW
4
|
N
7
|
NE
6
|
E
7
|
SE
9
|
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 | 39 | 37 | 29 | 22 | 15 | 13 | 26 | 40 |
| 600m | 26 | 23 | 19 | 11 | 13 | 11 | 19 | 24 |
| 300m | 23 | 20 | 16 | 10 | 12 | 10 | 17 | 20 |
| Valley | 24 | 20 | 16 | 10 | 12 | 10 | 16 | 19 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-3°
|
-3°
|
-3°
|
-3°
|
-2°
|
-3°
|
-4°
|
-4°
|
| 600m |
0°
|
-1°
|
-1°
|
0°
|
0°
|
0°
|
-1°
|
-2°
|
| 300m |
2°
|
1°
|
2°
|
2°
|
3°
|
3°
|
1°
|
0°
|
| Valley |
3°
|
3°
|
3°
|
3°
|
4°
|
4°
|
2°
|
1°
|
| Freezing Level |
300m
|
300m
|
400m
|
400m
|
300m
|
200m
|
100m
|
0m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-12°
|
-12°
|
-11°
|
-10°
|
-8°
|
-8°
|
-12°
|
-14°
|
| 600m |
-7°
|
-7°
|
-6°
|
-4°
|
-4°
|
-4°
|
-6°
|
-8°
|
| 300m |
-3°
|
-3°
|
-2°
|
0°
|
0°
|
0°
|
-3°
|
-4°
|
| Valley |
-1°
|
-1°
|
0°
|
1°
|
2°
|
2°
|
-1°
|
-2°
|
Additional weather information
Meteorologist's view
A severe wind overnight and to start the morning then winds easing. Cold conditions at all levels with frozen surfaces.
Weather
Clear spells overnight with strong northwest winds and the odd wintry shower. A dry day with some sunshine at first and winds easing but some thick high cloud will spread across from the southwest.
Chance of cloud-free hill tops
95%.
Low cloud and visibility
Excellent visibility with no low cloud expected during the day. The odd patch of summit cloud in the early hours.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry and rather cloudy overnight and during the morning. Outbreaks of sleet and snow spread in from the southwest in the afternoon, perhaps turning heavy for a time. There is a lot of uncertainty in how far north that will come. Feeling bitterly cold with severe gales and strong downslope gusts developing.
Chance of cloud-free hill tops
90%, becoming 40% in afternoon.
Maximum wind speed expected
East or Southeast 30 to 40mph gusts 50mph increasing 40 to 50mph gusts 70mph.
Temperature
- At 800m Minus 3C.
- Valley Plus 2 or 3C.
- Freezing level 300 or 400m.
Low cloud and visibility
Mainly good visibility in the morning with cloud above the tops. Cloud becoming extensive above 600m in the afternoon with very poor visibility in snow.
Mountain weather information
Thu 19 Feb
Sunrise:
Sunset:
Dry with bright or sunny spells and remaining cold. Strong southeasterly winds becoming light. Freezing level 200 to 400m.
Fri 20 Feb
Sunrise:
Sunset:
Turning increasing windy and unsettled with outbreaks of rain spreading in from the west, preceded briefly by snow. Southwesterly gales. Freezing level rising above summits.
Sat 21 Feb
Sunrise:
Sunset:
Remaining unsettled with showers or longer spells of rain. Gale force west or southwest winds. Freezing level above summits.
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.