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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for mainly dry conditions on Monday then for it to turn more unsettled on Tuesday. Lower confidence for the amounts of precipitation from Tuesday onwards.

  • Monday
  • Tuesday
  • Further outlook

Monday 19 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

Storm force winds Low 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

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

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

Cold and very windy on the tops. Mainly dry with bright or sunny spells.

Weather

06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Drizzle Cloudy Sunny intervals Sunny intervals Cloudy Light shower night
Chance of precipitation at 800m 60% 30% 30% 30% 40% 60%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m E 45 53 E 50 61 E 36 45 E 32 40 E 36 45 E 32 40
600m E 31 42 E 33 46 E 22 30 NE 19 26 E 25 33 NE 23 31
300m E 20 37 E 21 41 E 10 22 NE 10 21 E 15 30 NE 13 26
Valley E 20 36 E 21 40 E 10 21 NE 10 21 E 16 30 E 14 25

Temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 0 ° 0 ° 1 ° 1 ° 0 ° 0 °
600m 3 ° 3 ° 3 ° 4 ° 3 ° 2 °
300m 5 ° 5 ° 6 ° 6 ° 5 ° 5 °
Valley 6 ° 7 ° 8 ° 8 ° 7 ° 6 °

Feels like temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m -9 ° -9 ° -8 ° -7 ° -8 ° -9 °
600m -5 ° -5 ° -3 ° -2 ° -4 ° -4 °
300m 0 ° 0 ° 3 ° 3 ° 1 ° 1 °
Valley 2 ° 2 ° 5 ° 5 ° 3 ° 2 °

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 1,600 m 800 m 900 m 1,000 m 900 m 900 m
Sunrise: 07:47
Sunset: 16:16
Moon phase: Waxing gibbous

Weather

A cloudy start with perhaps the odd spot of drizzle. Cloud breaking up through the morning to allow some bright or sunny spells, although a few isolated light showers are possible in the afternoon and evening, these wintry above about 800m.

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

70%. Patchy cloud on low slopes in the morning will lift then some patches will occasionally affect tops above 800m during the day, lowering to 600m through the evening.

Visibility

Generally excellent air clarity away from any low cloud with extensive views. Temporary reductions to a few km in any showers in the afternoon and evening.

Meteorologist's view

Easterly winds across high exposed ridges and summits may suddenly gust 50-60mph at times during the afternoon. Feeling notably colder than recent days with a significant wind chill.

Ground conditions

No recent ground conditions report available.

Tuesday 20 November 2018

Sunrise: 07:49
Sunset: 16:15
Moon phase: Waxing gibbous

Weather

Showers overnight will die out for a time with sunny spells at first. Clouding over with showers arriving by midday, falling as sleet or snow above about 600m, then turning heavier and more frequent through the afternoon. Feeling bitterly cold on the tops with a severe wind chill.

Maximum wind speed expected

Mainly Easterly 30-40mph gusts 50mph, but sudden gusts of 60mph are possible over summits and high ridges exposed to the easterly winds.

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

70% in the morning with patchy cloud cover above 600m but becoming 20% in the afternoon as cloud becomes more extensive with patches coming down to lower slopes in showers.

Temperature

  • At 800m Zero or Plus 1 Celsius.
  • Valley Plus 6 rising to 7 or 8 Celsius.
  • Freezing level 600m.

Visibility

Away from any low cloud the air clarity will be good in the morning. Reducing to a few km or less in showers, perhaps briefly down to a few hundred metres in wintry showers.

Wednesday 21 November 2018

Sunrise: 07:50
Sunset: 16:13
Moon phase: Waxing gibbous

Cloudy in the early hours with outbreaks of rain and summit snow. Mainly dry by dawn with sunny spells and scattered wintry showers. Strong easterly winds on the tops. Freezing level 500m.

Thursday 22 November 2018

Sunrise: 07:52
Sunset: 16:12
Moon phase: Full

Mainly dry with bright intervals and isolated wintry showers. Strong easterly winds slowly easing. Freezing level rising to around 1000m.

Friday 23 November 2018

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

Plenty of uncertainty by this stage but it is expected to be mainly dry and cold with easterly winds continuing to ease.

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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