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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High becoming medium to low for the detail in timings of the worst of the conditions from Saturday, with various lows and troughs crossing the country from the west.

  • This evening
  • Thursday
  • Friday
  • Further outlook

Wednesday 12 December 2018

Sunset: 15:59
Moon phase: Waxing crescent

Chance of a few light showers across western ranges but most routes staying dry. Feeling cold with severe gales bringing a significant chill effect at height. Best of clear spells in the east, with cloud building across western ranges towards midnight.

Thursday 13 December 2018

Weather hazards

Gales High likelihood Hide detail

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.

Learn more about gales

Storm force winds Medium likelihood Show detail

Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.

Learn more about storm force winds

Severe chill effect Medium likelihood Show detail

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.

Learn more about severe chill effect

Poor visibility Low likelihood Show detail

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.

Learn more about poor visibility

Headline

Dry with winter sunshine increasing, particularly in west. Feeling very cold in the wind chill.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Cloudy Cloudy Cloudy Cloudy Sunny intervals Sunny intervals Cloudy Cloudy
Chance of precipitation at 800m 10% 10% 10% <05% 00% 00% 00% 00%

Wind speed and direction

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m SE 42 53 SE 46 58 SE 46 58 SE 42 54 SE 36 48 SE 37 47 SE 37 48 SE 32 42
600m SE 33 43 SE 35 47 SE 35 47 SE 30 40 SE 30 41 SE 25 35 SE 26 38 SE 22 34
300m SE 20 40 SE 22 46 SE 21 45 SE 17 38 SE 19 41 SE 14 34 SE 15 35 SE 13 31
Valley SE 20 41 SE 22 46 SE 21 45 SE 18 38 SE 19 41 SE 14 33 SE 15 34 SE 13 30

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m -3 ° -4 ° -4 ° -4 ° -4 ° -4 ° -4 ° -4 °
600m 0 ° -1 ° -2 ° -2 ° -1 ° -2 ° -2 ° -2 °
300m 2 ° 1 ° 1 ° 1 ° 1 ° 1 ° 1 ° 1 °
Valley 4 ° 3 ° 2 ° 2 ° 3 ° 3 ° 2 ° 2 °

Feels like temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m -13 ° -15 ° -15 ° -15 ° -14 ° -14 ° -14 ° -14 °
600m -9 ° -10 ° -11 ° -10 ° -10 ° -9 ° -10 ° -9 °
300m -4 ° -5 ° -5 ° -5 ° -4 ° -4 ° -5 ° -5 °
Valley -2 ° -3 ° -4 ° -3 ° -2 ° -2 ° -3 ° -3 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 400 m 300 m 300 m 300 m 300 m 200 m 200 m 200 m
Sunrise: 08:22
Sunset: 15:59
Moon phase: Waxing crescent

Weather

Rather cloudy through the night and at first during the morning with a chance of some light showers across western most ranges of the park, but most staying dry through the day with the cloud lifting and thining to bring occasional weak winter sunshine for the afternoon. However feeling very cold in the severe summit gales, which may touch storm force at times through the morning.

Chance of cloud-free mountain/hill tops at 800m

40% at first with a relatively extensive layer of cloud between 500 and 900m, which gradually breaks and thins with the chance increasing 75% for the afternoon.

Visibility

Good or very good.

Meteorologist's view

Severe wind chill most particularly marked through the morning.

Ground conditions

Area - Snowdon Date - 10 December 2018 Time - 11.00am Snow Above - Report By - Snowdon Warden Route Taken PYG Conditions No adverse ground conditions observed by the National Park Wardens. No snow or ice present. Kit Advice The following is a list of additional kit required based on the current conditions. Wear sturdy walking boots. Take waterproofs, hat, gloves and spare warm layers.

Friday 14 December 2018

Sunrise: 08:23
Sunset: 15:59
Moon phase: First quarter

Weather

Staying dry with the best of the plentiful winter sunshine developing across northern and western ranges. Still a degree of wind chill but not as marked as Thursday. Higher cloud spreading from the west during the late evening, but remaining dry.

Maximum wind speed expected

Southeasterly mean 20-25mph with gusts reaching 35mph over exposed ridges and summits.

Chance of cloud-free mountain/hill tops at 800m

95% with only patchy cloud around the summits, this largely confined south and east of Rhobell Fawr.

Temperature

  • At 800m Minus 3-5C
  • Valley Plus 1C lifting 7C for the afternoon
  • Freezing level Around 300m

Visibility

Good or very good out with the cloud.

Saturday 15 December 2018

Sunrise: 08:23
Sunset: 15:59
Moon phase: First quarter

Confidence limited for detail but very difficult wintry conditions expected as some point. Current thoughts have cloud building from west bringing patchy light snow during the morning, then perhaps dry with some brighter spells around mid-day, before a more organised area of snow, sleet, rain and freezing rain crosses from the west during the afternoon and evening, with extensive hill fog and severe chill effect in the gale force winds.

Sunday 16 December 2018

Sunrise: 08:24
Sunset: 15:59
Moon phase: First quarter

Rather cloudy with showers, which may merge to longer periods of rain and summit snow at times. Winds still brisk. Freezing level lifting to around 600m.

Monday 17 December 2018

Sunrise: 08:25
Sunset: 15:59
Moon phase: First quarter

Low confidence. Generally dry and bright, but band of rain and summit snow crossing from the west at some point.

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The Snowdonia mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Snowdon, standing at 1,085 metres.

The region can be divided into four areas with the northernmost area the most popular, including peaks such as Moel Hebog, Mynydd Mawr and the Nantlle Ridge. Many hikers tend to concentrate on Snowdon itself regarding it as a fine mountain. However it can become quite crowded, with the peak welcoming around half a million visitors every year, of which four fifths scale the peak on foot, while the remainder choose to take the train instead.

One of Snowdon’s main attractions is the sheer number and variety of paths that reach the peak. This means that everyone from mountaineering novices to climbing experts should find a way up the mountain that will suit their abilities or provide them with a sufficient test. The easiest is the Llanberis path which, being the longest, has the most shallow ascent. In contrast, the Watkin Path is widely seen as being the most demanding ascent, despite also being considered the prettiest.

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