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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for poor conditions at times Tuesday onwards, but lower for rainfall detail.

  • This evening
  • Monday
  • Tuesday
  • Further outlook

Sunday 25 June 2017

Sunset: 21:47
Moon phase: New

Dry and partly cloudy.

Monday 26 June 2017

Weather hazards

Strong sunlight Medium likelihood Show less detail

Strong sunlight has a heightened effect at altitude with a higher risk of sunburn and eye damage. High temperatures, especially when combined with high humidity, may lead to heat stroke or heat exhaustion. Snow-covered terrain will increase the effect of harmful UV rays, especially on the eyes. It is advisable to wear sun block and good quality eye-protection even on overcast days.

Learn more about strong sunlight

Forecast

Mostly dry and bright. Rain developing through the evening.

Weather

0000 0300 0600 0900 1200 1500 1800 2100
Weather at 800m Partly cloudy night Partly cloudy night Sunny intervals Cloudy Cloudy Cloudy Light rain Light rain
Chance of precipitation at 800m 00% 00% 00% 00% 00% 10% 50% 90%

Wind speed and direction

0000 0300 0600 0900 1200 1500 1800 2100
Altitude above mean sea level
900m W 11 14 W 8 10 W 7 9 SW 5 7 SW 5 8 SW 9 12 SE 14 17 SE 19 24
600m W 8 10 SW 5 7 NE 4 6 SW 4 7 SW 4 8 SW 7 11 SE 10 13 SE 14 19
300m SW 4 8 S 2 3 NE 1 3 SW 2 5 SW 3 7 SW 4 8 SE 5 10 SE 8 17
Valley W 5 10 W 5 9 W 4 7 S 5 9 SW 8 12 S 9 12 E 8 12 E 7 13

Temperature

0000 0300 0600 0900 1200 1500 1800 2100
Altitude above mean sea level
900m 6 ° 6 ° 6 ° 7 ° 9 ° 10 ° 10 ° 10 °
600m 8 ° 8 ° 8 ° 10 ° 11 ° 12 ° 12 ° 12 °
300m 10 ° 10 ° 11 ° 13 ° 14 ° 14 ° 14 ° 13 °
Valley 11 ° 10 ° 11 ° 14 ° 15 ° 16 ° 15 ° 14 °

Feels like temperature

0000 0300 0600 0900 1200 1500 1800 2100
Altitude above mean sea level
900m 3 ° 3 ° 4 ° 6 ° 7 ° 8 ° 7 ° 6 °
600m 6 ° 7 ° 7 ° 9 ° 10 ° 10 ° 10 ° 9 °
300m 10 ° 10 ° 11 ° 12 ° 13 ° 14 ° 13 ° 12 °
Valley 10 ° 10 ° 11 ° 14 ° 15 ° 15 ° 15 ° 14 °

Freezing level

0000 0300 0600 0900 1200 1500 1800 2100
Freezing level i 1,600 m 1,600 m 1,600 m 1,700 m 3,000 m 3,000 m 3,000 m 3,000 m
Sunrise: 04:51
Sunset: 21:47
Moon phase: New

Weather

A dry morning with some hazy sunshine, becoming cloudier through the afternoon with outbreaks of rain likely to spread from the west into the evening, becoming more persistent later.

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

90% becoming 20% by midnight.

Visibility

Mostly good through daylight hours, but cloud developing above 500 metres later, more especially on southeast facing hills, giving navigational difficulties.

Meteorologist's view

Nothing to add.

Ground conditions

No adverse ground conditions reported on 25 of Jun

Tuesday 27 June 2017

Sunrise: 04:52
Sunset: 21:47
Moon phase: Waxing crescent

Weather

Rain likely to become heavier and persistent for a time through the early hours, and likely to persist across the park for much of the day. Persistent cloud across south and southeast facing hill tops.

Temperature

  • At 800m Plus 9.
  • Valley Plus 12 rising to Plus 18 in leeward shelter.
  • Freezing level Well above summits.

Visibility

Persistent cloud above 500 metres, more especially on south or southeast facing hills, giving navigational difficulties. A few breaks may develop through the day, particularly in the northern lee of hills, but these will be unreliable.

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

10%.

Maximum wind speed expected

South or southeast 20-25 mph, gusts 30 mph.

Wednesday 28 June 2017

Sunrise: 04:52
Sunset: 21:47
Moon phase: Waxing crescent

A further period of heavy and persistent rain is likely, with extensive cloud across the hills. However, currently there is considerable uncertainty regarding detail.

Thursday 29 June 2017

Sunrise: 04:53
Sunset: 21:46
Moon phase: Waxing crescent

Showers or longer spells of rain likely with stronger northwest winds.

Friday 30 June 2017

Sunrise: 04:53
Sunset: 21:46
Moon phase: Waxing crescent

Similar conditions to Thursday, perhaps a little brighter later.

Issued at:

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, Myndd 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.