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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days


High for general trends, but Medium in exact details from Friday.

  • Thursday
  • Friday
  • Further outlook

Thursday 22 March 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

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 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

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


A cloudy start, but brightening up. Rain later.


06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Fog Fog Cloudy Cloudy Heavy rain Heavy rain
Chance of precipitation at 800m <05% 00% 00% 00% 20% 70%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m SW 27 33 SW 32 40 SW 38 48 SW 43 54 S 46 58 S 49 61
600m SW 18 24 SW 25 33 SW 30 40 S 31 42 S 31 42 S 32 44
300m SW 8 21 SW 14 28 SW 18 36 S 19 39 S 18 38 S 19 40
Valley SW 8 21 SW 14 28 SW 18 36 S 20 39 S 19 38 S 19 40


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

Feels like temperature

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

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 900 m 800 m 800 m 900 m 1,900 m 2,100 m
Sunrise: 06:15
Sunset: 18:33
Moon phase: Waxing crescent


Cloudy with any early drizzle soon clearing and cloud will begin to lift and break. Bright spells in the afternoon, perhaps the odd sunny break. Thickening and lowering cloud with outbreaks of rain in the evening, winds also strengthening.

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

40 to 60% during the afternoon, occasional or patchy cloud, base 600 to 900m. Nil to 30% early and late in the day, cloud extensive with bases around 600m.


Poor or very poor at times over the tops. Mostly good or very good lower down during daylight hours.

Meteorologist's view

Gales over the tops by dusk, perhaps stormy at times later in the evening.

Ground conditions

Area - Snowdon Date - 21 March 2018 Time - 12.00pm Snow Above - 800m Report By - Snowdon Warden Route Taken PyG Conditions Isolated stretches of snow. Streams and wet areas are frozen. Wet surfaces are coated in ice. Heavy frost cover on rocks and vegetation. Kit Advice The following is a list of additional kit required based on the current conditions. Ice axe and crampons recommended. Wear crampon compatible boots. Take waterproofs, hat, gloves and spare warm layers.

Friday 23 March 2018

Sunrise: 06:13
Sunset: 18:34
Moon phase: First quarter


Cloudy with outbreaks of rain overnight. Mostly dry during daylight hours, the cloud lifting and breaking to become bright with occasional sunny spells. However, the odd light shower is possible, these wintry over the summits. Showers or some longer outbreaks or rain, sleet and snow possible in the evening, snow mainly above 600m.

Maximum wind speed expected

West or Southeast 20 to 30mph, but 40mph overnight.

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

40 to 70% during daylight hours, occasional or patchy cloud, bases 600 to 900m. Nil to 30% overnight.


  • At 800m Plus 3 Celsius falling to Zero Celsius
  • Valley Plus 5 rising to 9 Celsius
  • Freezing level Above the summits becoming 800m


Poor or very poor at times over the tops, particularly overnight. Mostly good or very good lower down

Saturday 24 March 2018

Sunrise: 06:10
Sunset: 18:36
Moon phase: First quarter

A cloudy start with outbreaks of rain, sleet and snow, snow mainly above 600m. Becoming drier and brighter later. Light to moderate northeast winds. Freezing level around the summits.

Sunday 25 March 2018

Sunrise: 07:08
Sunset: 19:38
Moon phase: First quarter

Mainly dry and bright with some sunny or clear spells. Light to moderate north or northwesterly winds at height. Isolated showers possible, these wintry over the tops. Freezing level around the summits, although lower early and later in the day.

Monday 26 March 2018

Sunrise: 07:05
Sunset: 19:40
Moon phase: First quarter

Mainly dry and bright during the first part of the day, but becoming wet and windy later. Strengthening southerly winds, gales possible later. Freezing level around the summits, rising later.

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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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