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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for east to southeasterly flow persisting and for wintry precipitation being confined to highest peaks. Medium for the extent and timing of the showers within the flow and low for cloud amounts in the weekend.

  • This evening
  • Thursday
  • Friday
  • Further outlook

Wednesday 21 November 2018

Sunset: 16:13
Moon phase: Waxing gibbous

Rather cloudy start to the evening with a few light showers across the Park, but most staying dry with clear spells increasing for the late evening. Feeling cold with strong winds bringing a significant chill effect.

Thursday 22 November 2018

Weather hazards

Severe chill effect Medium likelihood Hide 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 Medium 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

Gales Low likelihood Show 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

Headline

A dry bright start, then turning cloudier for the afternoon as showers spread from the east.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Clear night Clear night Clear night Sunny intervals Light snow shower day Light snow shower day Cloudy Cloudy
Chance of precipitation at 800m 00% 00% 00% 00% 30% 30% 20% 10%

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 31 37 E 21 25 E 23 29 E 27 34 E 28 34 E 23 28 E 26 32 E 28 35
600m SE 21 28 E 15 20 E 18 26 E 20 30 E 18 26 E 13 17 E 16 24 E 18 27
300m SE 15 28 SE 10 20 E 13 25 E 14 28 E 11 23 E 6 14 E 9 19 E 12 24
Valley SE 15 28 SE 10 20 SE 13 25 E 14 27 E 11 23 E 6 13 E 9 19 SE 12 24

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m -1 ° 0 ° -1 ° -2 ° -1 ° -1 ° -1 ° -1 °
600m 2 ° 2 ° 1 ° 1 ° 1 ° 1 ° 1 ° 1 °
300m 4 ° 3 ° 2 ° 2 ° 4 ° 4 ° 3 ° 3 °
Valley 5 ° 4 ° 3 ° 3 ° 5 ° 5 ° 4 ° 4 °

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 -9 ° -7 ° -8 ° -10 ° -9 ° -8 ° -9 ° -9 °
600m -5 ° -3 ° -5 ° -6 ° -5 ° -4 ° -5 ° -4 °
300m -1 ° 0 ° -2 ° -3 ° 0 ° 2 ° -1 ° -1 °
Valley 0 ° 1 ° -1 ° -2 ° 2 ° 3 ° 1 ° 0 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 800 m 700 m 400 m 400 m 600 m 800 m 700 m 700 m
Sunrise: 07:52
Sunset: 16:12
Moon phase: Full

Weather

A dry night with clear spells, then bright or sunny periods for the morning. A few light showers across eastern ranges after from around noon, falling as snow above 800m. These dying away towards early evening.

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

90+% at first with well broken cloud cover, becoming from late morning 40% in the east and 70% in the west, with clouds bases lowering 600-800m, always more broken in the west.

Visibility

Good or very good becoming moderate or poor in showers, particularly across eastern hills.

Meteorologist's view

With cloud lowering across many eastern peaks from the afternoon, navigation at height will be difficult at times. This coupled with showers, marked wind chill effect and typical late November temperatures will necessitate appropriate seasonal preparation and equipping.

Ground conditions

No recent ground conditions report available.

Friday 23 November 2018

Sunrise: 07:54
Sunset: 16:11
Moon phase: Full

Weather

Rather cloudy in the east with a few scattered light showers cropping up. Western hills remaining dry and seeing good spells of weak sunshine, particularly widespread through the afternoon.

Maximum wind speed expected

East 15-20mph with gusts reaching 30mph over most exposed ridges and summits.

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

In the east the bases will be typically 550-700m, relatively extensive bringing a 30-40% chance. In the west 80% with bases well broken.

Temperature

  • At 800m Plus 2C
  • Valley Plus 3C increasing 8C during the afternoon
  • Freezing level 900m

Visibility

Good or very good below the cloud cover becoming moderate or poor in showers across eastern hills.

Saturday 24 November 2018

Sunrise: 07:55
Sunset: 16:10
Moon phase: Full

Most staying dry with the weak sunshine more widespread across western hills, but a few isolated light showers may develop in the east, these falling as snow over the highest peaks. Winds light with freezing level around 1000m.

Sunday 25 November 2018

Sunrise: 07:57
Sunset: 16:09
Moon phase: Waning gibbous

Occasional bright or sunny spells. Chance of showers a touch higher than Saturday, again these should be confined to the east of the Park. Summits winds picking up a little. Freezing level lowering a little with showers wintry for the highest peaks.

Monday 26 November 2018

Sunrise: 07:59
Sunset: 16:08
Moon phase: Waning gibbous

Mainly cloudy with some light drizzly showers, these falling as sleet and wet snow across highest peaks.

Issued at:
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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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