Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Cool conditions continuing on Thursday, turning milder later on Friday with rain and strong winds expected at times over the weekend. Moderate confidence in cloud and precipitation detail on Thursday and Friday.
This evening forecast
A cloudy evening mainly dry but a few snow flurries possible above 200m, southeasterly winds easing through the evening.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
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
Some mist and fog at first, then mostly cloudy but a few brighter spells in the afternoon.
| 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% | 10% | 10% | 10% | 30% | 50% |
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
32
|
E
20
|
E
12
|
E
8
|
NW
10
|
NW
14
|
W
16
|
W
22
|
| 600m |
E
18
|
E
13
|
E
9
|
SE
6
|
N
8
|
NW
11
|
W
9
|
W
12
|
| 300m |
E
14
|
E
9
|
E
6
|
E
3
|
N
5
|
NW
7
|
W
4
|
SW
8
|
| Valley |
E
14
|
E
8
|
E
5
|
E
3
|
N
5
|
NW
7
|
W
3
|
SW
8
|
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 | 43 | 29 | 18 | 11 | 13 | 19 | 20 | 27 |
| 600m | 32 | 23 | 14 | 9 | 11 | 16 | 13 | 18 |
| 300m | 28 | 19 | 11 | 6 | 8 | 11 | 8 | 16 |
| Valley | 27 | 18 | 10 | 5 | 8 | 11 | 8 | 16 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-4°
|
-3°
|
-3°
|
-3°
|
-2°
|
-1°
|
-1°
|
-1°
|
| 600m |
-1°
|
-1°
|
-1°
|
0°
|
0°
|
1°
|
1°
|
2°
|
| 300m |
1°
|
1°
|
1°
|
2°
|
3°
|
4°
|
3°
|
4°
|
| Valley |
2°
|
2°
|
2°
|
3°
|
4°
|
5°
|
5°
|
5°
|
| Freezing Level |
300m
|
300m
|
400m
|
400m
|
500m
|
600m
|
700m
|
900m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-13°
|
-11°
|
-9°
|
-7°
|
-7°
|
-7°
|
-7°
|
-7°
|
| 600m |
-8°
|
-6°
|
-5°
|
-4°
|
-3°
|
-3°
|
-3°
|
-3°
|
| 300m |
-4°
|
-3°
|
-1°
|
0°
|
1°
|
1°
|
2°
|
1°
|
| Valley |
-2°
|
-1°
|
0°
|
1°
|
2°
|
3°
|
3°
|
3°
|
Additional weather information
Meteorologist's view
Strong winds early in the morning will ease with winds veering to the southwest later in the day. Note the gradual lift in freezing level during the day as milder air moves in from the west.
Weather
A largely cloudy day but mostly dry, with early mist and fog a risk, becoming a bit brighter in the afternoon with a few sunny spells possible, likely to cloud over again into the evening with some light rain or drizzle later.
Chance of cloud-free hill tops
30% improving to 70% in the afternoon.
Low cloud and visibility
Layers of broken or overcast cloud above 400m are expected in the morning, cloud tending to lift and break during the morning becoming scattered above 600m in the afternoon. Visibility will be moderate at times in the morning but improving good later in the day. Conditions likely to deteriorate later in the evening with cloud thickening and lowering again.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy and wet start, falling as rain at all levels, perhaps sleet at first on the highest summits. A drier afternoon with a few bright spells developing. The chance of a few heavy showers later in the afternoon, these may be heavy for a time but moving through quite quickly, perhaps some gusty winds near showers.
Chance of cloud-free hill tops
40% improving to 70% in the afternoon.
Maximum wind speed expected
Southwesterly 25 mph gusts 35mph.
Temperature
- At 800m Plus 2 rising to 5 Celsius.
- Valley Plus 3 rising to 10 Celsius.
- Freezing level 1000m rising above all summits.
Low cloud and visibility
Layers of broken cloud can be expected above 400m during the morning, becoming scattered above 600m in the afternoon, best chance of less cloud around northern fells. Visibility will be moderate or poor in the morning but becoming good in the afternoon, perhaps dipping moderate in showers at times.
Mountain weather information
Sat 21 Feb
Sunrise:
Sunset:
A cloudy and wet start, some heavier spells in the rain at times, feeling milder despite strong westerly winds, risk of summit gales.
Sun 22 Feb
Sunrise:
Sunset:
A dry day with a few brighter spells, risk of a shower during the day, blustery westerly winds and feeling cooler than Saturday.
Mon 23 Feb
Sunrise:
Sunset:
Some mist and fog to start the day, likely to be some showers and turning colder, strong westerly winds, risk of summit gales.
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.