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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for the general themes. Medium for cloud amounts from Thursday.

  • Wednesday
  • Thursday
  • Further outlook

Wednesday 26 September 2018

Weather hazards

Gales Medium 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

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

Headline

Overcast with patchy rain or drizzle, though improving through the day.

Weather

06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Overcast Overcast Cloudy Sunny intervals Sunny day Clear night
Chance of precipitation at 800m 80% 60% 30% 20% 10% <05%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m SW 36 43 SW 33 39 SW 24 31 SW 21 27 S 18 23 S 17 21
600m SW 28 34 SW 23 29 SW 19 26 S 16 22 S 14 19 S 14 18
300m S 18 30 SW 15 25 SW 11 20 S 9 17 S 7 15 S 7 15
Valley S 18 31 SW 15 26 SW 11 21 S 9 18 S 8 16 S 8 15

Temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 8 ° 9 ° 9 ° 10 ° 10 ° 10 °
600m 10 ° 11 ° 11 ° 11 ° 11 ° 11 °
300m 11 ° 12 ° 13 ° 13 ° 12 ° 12 °
Valley 12 ° 14 ° 14 ° 15 ° 13 ° 13 °

Feels like temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 3 ° 5 ° 5 ° 6 ° 7 ° 7 °
600m 5 ° 7 ° 7 ° 8 ° 8 ° 8 °
300m 8 ° 10 ° 11 ° 12 ° 11 ° 11 °
Valley 9 ° 11 ° 13 ° 13 ° 12 ° 12 °

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 3,500 m 3,500 m 3,500 m 3,300 m 3,200 m 3,100 m
Sunrise: 07:08
Sunset: 19:06
Moon phase: Full

Weather

A cloudy start with occasional light rain or drizzle, mainly over western slopes, though improving through the day, the rain becoming more sporadic during the morning. Generally brighter and dry in the afternoon, with sunny spells dominating later.

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

20 to 40% during the morning, occasional or extensive cloud with base 300 to 600m. Becoming 60 to 90% in the afternoon as the cloud lifts and breaks.

Visibility

Poor to very poor at first, becoming mainly good or very good in the afternoon.

Meteorologist's view

Navigational difficulties possible at times due to hill fog.

Ground conditions

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

Thursday 27 September 2018

Sunrise: 07:10
Sunset: 19:04
Moon phase: Full

Weather

Low cloud and patchy mist and drizzle overnight. Mainly dry and skies brightening during the day as the cloud lifts and breaks, some sunny spells expected. Thicken cloud and patchy rain in the evening.

Maximum wind speed expected

West or Southwest 20 to 25mph gusting 35mph.

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

30 to 50% overnight, occasional or patchy cloud, bases 300 to 600m. Becoming 80% during daylight hours, mainly patches around the summits by the afternoon.

Temperature

  • At 800m Plus 8 Celsius
  • Valley Plus 12 Celsius rising to 18 Celsius.
  • Freezing level Above the summits.

Visibility

Mostly good or very good, but poor at times overnight. Very poor at first over the tops.

Friday 28 September 2018

Sunrise: 07:12
Sunset: 19:01
Moon phase: Waning gibbous

Cloudy with patchy rain during the early hours. Dry and bright during the day, good sunny spells expected. Light north or northwest winds at height.

Saturday 29 September 2018

Sunrise: 07:13
Sunset: 18:59
Moon phase: Waning gibbous

Dry and bright. Variable cloud cover, but any cloudy mostly above the summits. Moderate or fresh west or southwest winds over the tops.

Sunday 30 September 2018

Sunrise: 07:15
Sunset: 18:57
Moon phase: Waning gibbous

Bright spells and the chance of some showery rain. Moderate or fresh north or northwest winds.

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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