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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for overall evolution, but lower for low cloud and visibility detail Tuesday and Wedneday, and also timings of rain bands later this week.

  • This evening
  • Tuesday
  • Wednesday
  • Further outlook

Monday 25 September 2017

Sunset: 19:09
Moon phase: Waxing crescent

Rather cloudy towards the east of the park, but clearer towards the west.

Tuesday 26 September 2017

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

Forecast

Poor visibilities and low cloud at first, improving by afternoon.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Partly cloudy night Cloudy Fog Fog Cloudy Cloudy Cloudy Partly cloudy night
Chance of precipitation at 800m 10% 10% 10% 00% 10% 10% 00% 00%

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 SE 9 11 SE 8 10 SE 10 12 SE 11 15 SE 13 18 S 13 18 SE 13 17 SE 19 25
600m SE 7 9 SE 7 9 SE 7 10 SE 9 13 S 10 15 S 10 15 SE 8 13 SE 13 19
300m SE 4 8 SE 4 7 SE 4 8 SE 5 10 SE 6 14 S 6 14 SE 5 12 SE 7 17
Valley SW 4 6 S 3 6 NW 4 6 SE 7 12 S 11 19 S 9 17 SE 7 13 SE 7 14

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 8 ° 8 ° 8 ° 9 ° 10 ° 11 ° 10 ° 9 °
600m 10 ° 10 ° 10 ° 11 ° 13 ° 13 ° 12 ° 11 °
300m 12 ° 12 ° 12 ° 13 ° 15 ° 16 ° 14 ° 13 °
Valley 12 ° 12 ° 12 ° 14 ° 16 ° 17 ° 15 ° 14 °

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 6 ° 6 ° 6 ° 7 ° 8 ° 8 ° 7 ° 6 °
600m 9 ° 9 ° 8 ° 9 ° 11 ° 11 ° 10 ° 9 °
300m 11 ° 11 ° 11 ° 13 ° 15 ° 15 ° 13 ° 12 °
Valley 13 ° 12 ° 12 ° 14 ° 16 ° 16 ° 15 ° 13 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,100 m 2,100 m 2,000 m 2,100 m 2,000 m 2,100 m 2,200 m 2,100 m
Sunrise: 07:08
Sunset: 19:06
Moon phase: Waxing crescent

Weather

A dull start with areas of low cloud giving occasional hill fog conditions and perhaps still the odd spot of drizzle. However, cloud bases lifting during the morning and visibilities improving to give some bright or sunny spells by the afternoon. An isolated light afternoon shower is possible, but most places should be dry with light winds across the park.

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

20% becoming 90%.

Visibility

Poor at first but improving to moderate to good by the afternoon.

Meteorologist's view

Nothing to add.

Ground conditions

No adverse ground conditions reported on 25 of Sep

Wednesday 27 September 2017

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

Weather

Early hill and valley fog patches will readily disperse through the morning as the south-easterly breeze increases. Morning brightness will be replaced by thickening cloud through the afternoon, with rain arriving into the evening, turning heavy at times.

Temperature

  • At 800m Plus 10 Celsius.
  • Valley Plus 11 Celsius rising to Plus 17 Celsius.
  • Freezing level Above summits.

Visibility

Poor at first in the morning, soon improving to good by the afternoon, but deteriorating again moderate to poor into the evening.

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

20% early and late in the day, but an improvement to 90% from late morning through until evening.

Maximum wind speed expected

Southeast 30mph gust 40mph.

Thursday 28 September 2017

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

Overnight cloud and rain quickly clearing to leave a fine and dry day with very good visibilities and largely cloud free hill tops. Light to moderate winds.

Friday 29 September 2017

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

A further band of cloud, rain and strong winds crossing the park around the middle of the day with improving conditions again later.

Saturday 30 September 2017

Sunrise: 07:15
Sunset: 18:57
Moon phase: First quarter

Sunny intervals and occasional showers, with moderate to fresh southwesterly winds. Cloud probably thickening from the west later with strengthening winds and outbreaks of rain arriving by midnight.

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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