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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for general trend. Low for detail of low cloud and poor visibility from Tuesday to Friday.

  • This evening
  • Monday
  • Tuesday
  • Further outlook

Sunday 24 September 2017

Sunset: 19:11
Moon phase: New

Cloudy with periods of heavy rain and poor visibility. By midnight the heaviest and most persistent of the rain will have moved eastwards away from the park.

Monday 25 September 2017

Weather hazards

Poor visibility Medium 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

Forecast

Cloudy with widespread mist and fog

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Fog Fog Fog Mist Sunny intervals Cloudy Cloudy Cloudy
Chance of precipitation at 800m 20% 20% 20% 10% 10% 10% 20% 20%

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 6 7 NW 9 12 N 7 10 N 5 9 N 5 11 N 5 10 N 3 6 E 5 6
600m W 4 6 N 5 8 N 5 8 N 5 8 N 6 12 N 5 11 N 3 6 E 4 5
300m W 2 4 NW 3 6 N 2 5 N 3 8 N 4 11 N 4 10 NW 2 5 E 3 5
Valley W 4 7 NW 4 6 NE 6 8 NE 7 10 NE 7 12 NE 8 13 NE 6 9 N 3 5

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 9 ° 8 ° 8 ° 9 ° 9 ° 10 ° 9 ° 9 °
600m 11 ° 10 ° 9 ° 10 ° 12 ° 12 ° 11 ° 10 °
300m 12 ° 11 ° 11 ° 12 ° 14 ° 15 ° 12 ° 11 °
Valley 12 ° 11 ° 10 ° 13 ° 16 ° 16 ° 13 ° 10 °

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 ° 8 ° 9 ° 8 ° 8 °
600m 10 ° 9 ° 8 ° 9 ° 10 ° 11 ° 10 ° 10 °
300m 11 ° 11 ° 10 ° 12 ° 14 ° 14 ° 12 ° 10 °
Valley 12 ° 11 ° 9 ° 13 ° 16 ° 16 ° 13 ° 10 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,400 m 2,300 m 2,300 m 2,300 m 2,300 m 2,300 m 2,200 m 2,200 m
Sunrise: 07:07
Sunset: 19:09
Moon phase: Waxing crescent

Weather

Cloudy with extensive mist and fog and occasional light rain. During the morning the cloud base will lift improving conditions at lower levels but higher peaks are expected to remain shrouded in cloud all day. Most of the park will become dry during the morning, though further showery bursts of mainly light rain are possible.

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

10%.

Visibility

Generally poor but improving to moderate at times during the morning at lower elevations.

Meteorologist's view

Nothing to add.

Ground conditions

No adverse ground conditions reported on 24 of Sep

Tuesday 26 September 2017

Sunrise: 07:08
Sunset: 19:06
Moon phase: Waxing crescent

Weather

After a dull start with areas of mist and fog conditions will steadily improve during the morning with some bright or sunny spells likely in the afternoon. A dry day with light winds across the park.

Temperature

  • At 800m Plus 8 becoming Plus 11 Celsius.
  • Valley Plus 5 becoming Plus 15 Celsius.
  • Freezing level Above summits.

Visibility

Poor during the morning improving to moderate, perhaps good in places, during the afternoon.

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

20% becoming 70% during the afternoon.

Maximum wind speed expected

Southerly 10 mph

Wednesday 27 September 2017

Sunrise: 07:10
Sunset: 19:04
Moon phase: Waxing crescent

Starting dry and largely fine on Wednesday with a moderate south easterly breeze. Winds will slowly increase through the day as a band of rain and associated hill fog moves in from the west during the afternoon. The rain may turn heavy and persistent towards midnight with winds reaching gale strength.

Thursday 28 September 2017

Sunrise: 07:12
Sunset: 19:01
Moon phase: First quarter

A cloudy start with a little rain or drizzle but soon becoming drier and brighter from the west with winds much lighter.

Friday 29 September 2017

Sunrise: 07:13
Sunset: 18:59
Moon phase: First quarter

Cloudy with heavy rain and strong winds during the early hours. However, during the morning the rain will clear eastwards and cloud will break allowing some drier brighter spells to develop. Further showers are also possible.

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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