Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for changeable weather to continue over the weekend and into next week. Low confidence for detail of rainfall on a daily basis.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard 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.

hazard 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

Cold and mainly dry.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Cloudy Sunny intervals Sunny intervals Sunny day Partly cloudy (night) Partly cloudy (night)
Chance of precipitation
(at 800m)
20% 10% <05% <05% <05% <05%

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
21
SE
20
SE
20
SE
22
SE
21
600m SE
17
SE
16
SE
15
SE
15
SE
14
SE
15
300m SE
10
SE
10
SE
10
SE
9
SE
9
SE
9
Valley SE
10
SE
10
SE
10
SE
10
SE
9
SE
10
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m 28 26 25 25 26 25
600m 22 21 20 19 20 19
300m 20 20 17 17 17 18
Valley 20 20 17 17 18 19

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
Valley
Freezing Level
1,000m
1,000m
1,000m
1,000m
1,000m
1,000m

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
900m
-6°
-6°
-5°
-5°
-6°
-6°
600m
-2°
-2°
-1°
-1°
-1°
-1°
300m
Valley

Additional weather information

Meteorologist's view

Strong winds over the highest summits will lead to slow progress and a significant wind chill.

Weather

Largely dry with variable cloud cover, although there is a small chance of an isolated shower, mainly this morning.

Chance of cloud-free hill tops

40% increasing 70%

Low cloud and visibility

Generally very good visibility with some areas of cloud around 500-600 metres at first this morning, becoming patchy cloud around 700 metres.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Dry overnight with increasing amounts of cloud, some of this low level cloud spreading in from the east. From late morning and through the rest of the day there is a chance of outbreaks of rain arriving at times, with summit sleet or snow, these most likely across eastern areas. Cold southeasterly summit winds.

Chance of cloud-free hill tops

Possibly decreasing 30% across eastern areas at times, otherwise 70%.

Maximum wind speed expected

Southeasterly 20 mph gusting 30mph.

Temperature

  • At 800m Plus 1 to 3 Celsius
  • Valley Minus 1 rising to 7 Celsius
  • Freezing level Above summits

Low cloud and visibility

Poor in areas of cloud between 200 and 500 metres, mainly across eastern areas, this tending to clear through the morning. Cloud may become more extensive down to 600 metres should rain arrive from the east through the day, again most likely across eastern areas.

Mountain weather information

Mon 19 Jan

Sunrise:
Sunset:

Currently a largely dry day is expected but this may change with rain potentially arriving from the west at times. Light winds.

Tue 20 Jan

Sunrise:
Sunset:

Currently a largely dry morning is expected, but with spells of rain likely to spread east through the afternoon and evening. Strengthening southeast winds, with strong winds or gales probably developing.

Wed 21 Jan

Sunrise:
Sunset:

Remaining windy with the chance of further spells of rain.

Updated at:

Summit specific forecast

Mountain summit forecast map

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