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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High on Saturday, then Medium for details on Sunday. Remaining Medium for early next week.

  • This evening
  • Saturday
  • Sunday
  • Further outlook

Friday 17 November 2017

Sunset: 16:19
Moon phase: Waning crescent

Mainly dry with patchy cloud cover. Windy over the tops.

Saturday 18 November 2017

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

Forecast

Rather cloudy with occasional rain. Windy with a significant wind chill over the tops.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Cloudy Cloudy Light rain Light rain Overcast Sleet shower Sleet shower Overcast
Chance of precipitation at 800m 20% 30% 50% 60% 30% 50% 60% 30%

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 W 27 32 W 29 35 W 27 33 NW 21 26 NW 20 25 NW 22 27 NW 22 27 NW 22 28
600m W 16 22 W 18 25 W 19 25 W 14 18 NW 14 19 NW 15 19 NW 14 18 NW 13 18
300m W 8 19 W 9 22 W 11 21 NW 7 15 NW 8 16 NW 8 17 NW 7 16 NW 6 15
Valley W 16 29 W 14 28 W 16 29 W 10 19 NW 12 21 NW 12 23 NW 11 19 W 8 12

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 1 ° 1 ° 2 ° 2 ° 2 ° 1 ° 1 ° 1 °
600m 4 ° 4 ° 4 ° 4 ° 4 ° 4 ° 3 ° 3 °
300m 6 ° 6 ° 6 ° 6 ° 7 ° 6 ° 5 ° 5 °
Valley 6 ° 6 ° 7 ° 7 ° 8 ° 7 ° 6 ° 6 °

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 -6 ° -6 ° -4 ° -4 ° -4 ° -6 ° -6 ° -6 °
600m -1 ° -1 ° -1 ° 0 ° 0 ° -1 ° -2 ° -1 °
300m 3 ° 3 ° 3 ° 4 ° 5 ° 4 ° 3 ° 3 °
Valley 3 ° 3 ° 4 ° 5 ° 6 ° 5 ° 4 ° 4 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 1,000 m 1,000 m 1,300 m 1,200 m 1,100 m 1,000 m 900 m 900 m
Sunrise: 07:45
Sunset: 16:17
Moon phase: New

Weather

Mostly cloudy with patchy light rain, turning wintry at times over the tops. It will be windy over the tops with a significant wind chill.

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

20 to 40%, the cloud often extensive with bases 600 to 900m, perhaps 300m at times during the morning.

Visibility

Moderate or good, but poor or very poor at times at height.

Meteorologist's view

Any significant gusts in the valleys will be isolated.

Ground conditions

No adverse ground conditions reported on 17 of Nov

Sunday 19 November 2017

Sunrise: 07:47
Sunset: 16:16
Moon phase: New

Weather

Mainly dry overnight with the odd clear spells. Mostly cloudy during daylight hours, the cloud tending to thicken and lower during the day. Outbreaks of rain, sleet and snow at times, snow initially above 800m but turning to rain at all levels by the end of the day.

Temperature

  • At 800m Around Zero Celsius, rising to plus 4 Celsius.
  • Valley Plus 2 Celsius rising to 9 Celsius
  • Freezing level 600 to 800m, rising 1800m

Visibility

Mainly very good at first, becoming but moderate or poor during the day, very poor at height.

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

30 to 50% overnight and early morning, becoming Nil through the afternoon as the cloud thickens and lowers.

Maximum wind speed expected

West or Northwest 5 to 15mph, later Southwest 25 gusts 35mph.

Monday 20 November 2017

Sunrise: 07:49
Sunset: 16:15
Moon phase: New

Cloudy with rain, drizzle and mist. The rain occasionally heavy. Hill fog. Westerly winds strong to gale force at times.

Tuesday 21 November 2017

Sunrise: 07:50
Sunset: 16:13
Moon phase: New

Cloudy with outbreaks of rain, heavy at times. Hill fog. Southwest winds, strong to gale force at times.

Wednesday 22 November 2017

Sunrise: 07:52
Sunset: 16:12
Moon phase: Waxing crescent

Cloudy with outbreaks of rain, heavy at times. Hill fog. Gale or severe gale force southwest winds.

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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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