Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for gradually becoming more settled through Friday and a largely fine day Saturday but confidence falling over timing of arrival of snow Sunday and then very low from Monday due to uncertainties over the track of a low, currently expected to move east across northern England.
This evening forecast
Cloudy with snow, perhaps occasionally heavy and falling initially as rain below about 750m. Freshening easterly winds with a severe chill effect.
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.
Blizzards
Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.
Heavy Persistent Snow
Heavy snow can lead to rapid changes in underfoot conditions and paths may become treacherous or hidden. It also brings very poor visibility and often makes navigation much more challenging. When deep snow accumulates progress is often time consuming and strenuous, significantly affecting the distance one can travel on foot. Deep drifts can develop if snow is combined with strong winds. A heightened avalanche risk is possible and avalanche reports should be consulted where available.
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.
Mountain weather forecast
Cloudy with occasionally heavy snow. Strong easterly winds. Very 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) |
80% | 80% | 70% | 70% | 70% | 50% | 30% | 10% |
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
17
|
E
21
|
E
31
|
NE
34
|
NE
32
|
NE
29
|
NE
27
|
NE
22
|
| 600m |
E
13
|
E
14
|
E
18
|
NE
20
|
NE
22
|
NE
21
|
NE
18
|
NE
13
|
| 300m |
E
11
|
E
12
|
E
14
|
NE
14
|
NE
16
|
NE
16
|
NE
13
|
NE
9
|
| Valley |
E
11
|
E
12
|
E
14
|
NE
14
|
NE
15
|
NE
15
|
NE
12
|
NE
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 | 23 | 31 | 43 | 46 | 45 | 41 | 36 | 29 |
| 600m | 21 | 25 | 32 | 32 | 34 | 32 | 28 | 21 |
| 300m | 20 | 23 | 29 | 28 | 31 | 30 | 26 | 19 |
| Valley | 20 | 23 | 28 | 28 | 29 | 29 | 25 | 17 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-1°
|
-2°
|
-3°
|
-4°
|
-4°
|
-4°
|
-4°
|
-4°
|
| 600m |
1°
|
0°
|
-1°
|
-1°
|
-2°
|
-1°
|
-2°
|
-2°
|
| 300m |
3°
|
2°
|
1°
|
1°
|
1°
|
1°
|
1°
|
0°
|
| Valley |
4°
|
3°
|
2°
|
2°
|
2°
|
3°
|
3°
|
2°
|
| Freezing Level |
800m
|
600m
|
400m
|
400m
|
400m
|
300m
|
400m
|
300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-8°
|
-10°
|
-12°
|
-13°
|
-13°
|
-13°
|
-13°
|
-12°
|
| 600m |
-4°
|
-6°
|
-8°
|
-9°
|
-9°
|
-9°
|
-8°
|
-8°
|
| 300m |
-1°
|
-2°
|
-4°
|
-5°
|
-5°
|
-4°
|
-4°
|
-4°
|
| Valley |
0°
|
-1°
|
-3°
|
-3°
|
-3°
|
-2°
|
-2°
|
-1°
|
Additional weather information
Meteorologist's view
Feeling bitterly cold with gusts around 55mph over ridges and summits.
Weather
Cloudy through the early hours with outbreaks of occasionally heavy snow. Then a cloudy morning with outbreaks of occasionally heavy snow through the morning and into the early afternoon, with blizzards possible, the snow gradually easing from the north through the afternoon and evening with clear spells developing. Lying snow, especially above about 700m, will increasingly drift in the strong winds
Chance of cloud-free hill tops
Little chance through daylight hours, but chances improve through the evening.
Low cloud and visibility
Periods of cloud above 450-600m, with patches below, until late afternoon then gradually becoming more occasional above 600-750m. Away from cloud visibility good, falling to a few kilometres in snow and near zero in heavier snow and drifting or blowing snow.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Largely clear and dry overnight. Then a dry and sunny day, although the sunshine will turn hazy through the afternoon as cloud above the summits increases. Cloud thickens through the evening but it should remain dry.
Chance of cloud-free hill tops
100% through daylight hours, but falling through the evening.
Maximum wind speed expected
Northerly becoming Variable 10mph or less, then Southerly 20 to 25mph through the afternoon, then increasing 30-40mph through the evening, with gusts around 60mph over ridges and summits.
Temperature
- At 800m Around minus 5 Celsius rising to minus 2 Celsius
- Valley Around minus 3 or 4 Celsius at dawn rising to plus 3 or 4 Celsius through the day
- Freezing level All levels rising to 300m
Low cloud and visibility
Very good or excellent with good panoramic views of surrounding mountains.
Mountain weather information
Sun 15 Feb
Sunrise:
Sunset:
Cloudy with occasionally heavy snow, turning increasingly to rain below about 900m, spreading east in morning clearing to wintry showers in afternoon. Strong to gale force southerly winds veering southwesterly and easing. Freezing level rising to 1000m, falling to 750m later.
Mon 16 Feb
Sunrise:
Sunset:
Mostly cloudy with showers or longer spells of occasionally heavy rain and, mainly above about 600m, snow. Fresh southwesterly winds turning northerly and strengthening. Freezing level 750m-1000m.
Tue 17 Feb
Sunrise:
Sunset:
Mainly dry with sunny spells. Strong northerly winds easing, freshening easterly winds later. Freezing level 750m falling to 600m.
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.