Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for overall unsettled weather over the next number of days. Lower on the detail surrounding the rain through the afternoon.
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.
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.
Mountain weather forecast
A generally dry but cloudy day ahead with some light outbreaks of rain or sleet possible later. Light southerly winds gradually increasing throughout.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
<05% | <05% | 10% | 30% | 10% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
W
10
|
S
14
|
S
22
|
S
29
|
S
37
|
S
45
|
| 600m |
S
5
|
S
14
|
S
20
|
S
24
|
S
26
|
S
31
|
| 300m |
SE
2
|
S
9
|
S
15
|
S
18
|
SE
17
|
S
21
|
| Valley |
S
2
|
S
9
|
S
15
|
S
18
|
SE
17
|
S
21
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 12 | 18 | 28 | 37 | 45 | 55 |
| 600m | 6 | 18 | 27 | 32 | 34 | 41 |
| 300m | 4 | 14 | 24 | 30 | 29 | 37 |
| Valley | 4 | 14 | 23 | 29 | 29 | 37 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-2°
|
-1°
|
0°
|
2°
|
2°
|
2°
|
| 600m |
0°
|
1°
|
3°
|
4°
|
4°
|
4°
|
| 300m |
3°
|
4°
|
6°
|
7°
|
7°
|
6°
|
| Valley |
4°
|
6°
|
7°
|
9°
|
8°
|
8°
|
| Freezing Level |
500m
|
500m
|
600m
|
800m
|
1,000m
|
900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-7°
|
-7°
|
-7°
|
-6°
|
-6°
|
-7°
|
| 600m |
-2°
|
-4°
|
-3°
|
-2°
|
-2°
|
-3°
|
| 300m |
2°
|
1°
|
2°
|
3°
|
3°
|
2°
|
| Valley |
3°
|
3°
|
4°
|
5°
|
5°
|
4°
|
Additional weather information
Meteorologist's view
A reasonable day for hill walking with generally dry conditions. However with temperatures dropping it is likely to feel rather cold near summits with multiple layers advised. With the potential for some patchy rain or sleet waterproof clothing would also be advised. Winds increasing through the evening which may make walking more challenging in exposed locations.
Weather
A dry but cloudy start to the day as a band of cloud and rain makes a gradual approach from the west. This will see a lowering of cloud through the afternoon with the potential for the odd spot of light patchy rain, this may have a wintry component to it over the highest summits.
Chance of cloud-free hill tops
90% dropping to 60% for a time through the afternoon.
Low cloud and visibility
Cloud generally above summits with potential for patchy cloud around 700-900m from mid-afternoon onwards. Visibility generally very good outside any patchy rain or cloud, which could drop visibilities to poor.
Mountain weather information
Weather
Any lingering overnight rain or sleet should quickly clear eastwards after dawn with patchy lower cloud moving away with it. Skies will then turn brighter with sunny spells and blustery scattered showers expected for the remainder of the day. These showers have the potential to be heavy at times and turning wintry with the risk of hail.
Chance of cloud-free hill tops
40% rising 70% through the morning.
Maximum wind speed expected
Southerly or southeasterly 30-40mph gusting 40-50mph.
Temperature
- At 800m Minus 2 Celsius rising to Plus 1 Celsius.
- Valley Plus 5 Celsius rising to Plus 7 Celsius.
- Freezing level 600m rising to 1000m.
Low cloud and visibility
Patchy low cloud around 600-800m through the morning which should gradually clear eastwards. Cloud bases should then generally be above summits with the odd patch of cloud between 600-900m, generally in association with showers. Visibilities moderate to poor or perhaps very poor at first quickly becoming very good to excellent outside of any patchy cloud or showers, through the afternoon, which could drop visibilities temporarily to poor or very poor.
Mountain weather information
Sun 12 Apr
Sunrise:
Sunset:
A chilly start with a continuation of sunny spells and scattered showers. Showers once again have the potential to be heavy at times, with a low risk of them falling as hail, the odd rumble of thunder is also possible. Freezing level above summits.
Mon 13 Apr
Sunrise:
Sunset:
Another cold start. Further sunny spells and scattered showers although showers more isolated than previous day. Winds easing becoming light to moderate. Freezing level above summits.
Tue 14 Apr
Sunrise:
Sunset:
A drier day ahead with a reasonable amount of sunshine throughout the day. This may turn rather hazy at times. Light to moderate winds once again with freezing levels 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.