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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for Wednesday to Friday. Low for the weekend.

  • This evening
  • Wednesday
  • Thursday
  • Further outlook

Tuesday 14 August 2018

Sunset: 20:46
Moon phase: Waxing crescent

A mostly cloudy evening with occasional hill fog. Mostly dry with just a few spots of light drizzle. Fresh southerly winds, strong over the summits.

Wednesday 15 August 2018

Weather hazards

Poor visibility High likelihood Hide 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 Medium 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

Heavy persistent rain Medium likelihood Show detail

Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Learn more about heavy persistent rain

Headline

Patchy drizzle in the morning, heavier rain in the afternoon. Gales across the summits.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Cloudy Mist Cloudy Drizzle Light rain Heavy rain Heavy rain Heavy rain
Chance of precipitation at 800m 30% 30% 20% 40% 70% 80% >95% 80%

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 SW 26 32 SW 28 35 SW 29 37 SW 33 43 SW 37 48 SW 39 51 SW 39 52 SW 37 49
600m SW 19 24 SW 19 26 SW 21 28 SW 23 32 SW 27 37 SW 29 40 SW 29 41 SW 27 38
300m SW 10 20 SW 9 23 SW 12 26 SW 13 27 SW 15 33 SW 15 34 SW 15 34 SW 14 35
Valley SW 10 20 SW 9 23 SW 12 26 SW 14 28 SW 16 34 SW 16 35 SW 16 34 SW 15 34

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 12 ° 10 ° 10 ° 12 ° 12 ° 12 ° 12 ° 11 °
600m 13 ° 12 ° 12 ° 13 ° 14 ° 14 ° 14 ° 13 °
300m 15 ° 14 ° 14 ° 15 ° 16 ° 16 ° 15 ° 15 °
Valley 16 ° 15 ° 16 ° 16 ° 17 ° 17 ° 16 ° 16 °

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 8 ° 6 ° 6 ° 7 ° 7 ° 7 ° 7 ° 6 °
600m 10 ° 9 ° 9 ° 10 ° 9 ° 9 ° 9 ° 9 °
300m 13 ° 13 ° 13 ° 13 ° 13 ° 13 ° 13 ° 13 °
Valley 14 ° 14 ° 14 ° 14 ° 15 ° 14 ° 14 ° 14 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 3,100 m 3,200 m 3,300 m 3,100 m 3,400 m 3,500 m 3,400 m 2,700 m
Sunrise: 05:56
Sunset: 20:44
Moon phase: Waxing crescent

Weather

Low cloud with a little patchy drizzle through the early hours. Brightening up briefly around dawn, but further low cloud from mid morning with rain or drizzle most persistent over western hills. Rain turns heavier through the afternoon and evening, then eases overnight. Breezy with summit gales.

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

30%, cloud persistent above 400m across western hills for much of the day, more broken above 500-600m further east.

Visibility

Generally poor at height in low cloud. Often moderate or poor at low levels in drizzle.

Meteorologist's view

Winds increasing through the day with gales likely across the summits in the afternoon. Strong winds and rain will give a notable wind chill.

Ground conditions

No recent ground conditions report available. For archived reports see - http://www.snowdonia.gov.wales/visiting/walking/ground-conditions

Thursday 16 August 2018

Sunrise: 05:58
Sunset: 20:42
Moon phase: Waxing crescent

Weather

Rain soon clearing in the early hours with cloud breaking up around dawn to give good sunny spells through the day. A few scattered showers breaking out in the afternoon. Largely clear skies in the evening and overnight.

Maximum wind speed expected

West 20 gusting 30 mph.

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

95%, some patchy cloud on the higher summits before dawn, otherwise summits cloud free.

Temperature

  • At 800m Plus 7 Celsius.
  • Valley Plus 9 Celsius rising to 19 Celsius.
  • Freezing level Above the summits.

Visibility

Very good or excellent.

Friday 17 August 2018

Sunrise: 06:00
Sunset: 20:40
Moon phase: Waxing crescent

Turning increasingly cloudy with outbreaks of rain. Strong westerly winds with a risk of gales across the summits.

Saturday 18 August 2018

Sunrise: 06:02
Sunset: 20:38
Moon phase: First quarter

Most likely staying dry with strong westerly winds easing. Some bright or sunny spells possible. However, confidence is low, especially later in the day with a risk of rain and strengthening winds.

Sunday 19 August 2018

Sunrise: 06:03
Sunset: 20:36
Moon phase: First quarter

A cloudy, windy day with outbreaks of rain and summit gales likely. Low confidence for details.

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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