This website uses cookies. Read about how we use cookies.

Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

  • This evening
  • Sunday
  • Monday
  • Further outlook

Saturday 24 June 2017

Sunset: 21:47
Moon phase: New

Becoming dry this evening with some late sunshine. Breezy across the peaks.

Sunday 25 June 2017

Weather hazards

Poor visibility Medium likelihood Show less 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

Strong sunlight Medium likelihood Show more details

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

Heavy persistent rain Low likelihood Show more details

Prolonged exposure to heavy rain can result in drenched clothing and a risk of hypothermia if not wearing good quality waterproofs. Terrain may turn increasingly boggy underfoot, while mountain streams will rapidly rise into spate and may 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

Forecast

Cloudy with rain or drizzle through the morning. Gradually turning brighter later.

Weather

0000 0300 0600 0900 1200 1500 1800 2100
Weather at 800m Cloudy Light rain Light rain Light rain Cloudy Cloudy Sunny intervals Partly cloudy night
Chance of precipitation at 800m 50% 70% 80% 70% 50% 20% 10% 00%

Wind speed and direction

0000 0300 0600 0900 1200 1500 1800 2100
Altitude above mean sea level
900m W 24 29 W 22 28 W 22 27 W 18 24 W 21 28 W 20 27 W 17 23 SW 13 16
600m W 16 21 W 16 21 W 16 21 W 14 19 W 16 22 W 15 23 W 12 18 SW 10 13
300m W 9 19 W 9 18 W 9 16 W 8 16 W 9 20 W 9 21 W 7 15 SW 5 9
Valley W 15 27 W 15 26 W 14 24 W 14 22 W 16 27 W 17 29 W 14 24 SW 9 15

Temperature

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

Feels like temperature

0000 0300 0600 0900 1200 1500 1800 2100
Altitude above mean sea level
900m 1 ° 1 ° 2 ° 3 ° 2 ° 3 ° 3 ° 3 °
600m 5 ° 4 ° 5 ° 6 ° 6 ° 6 ° 7 ° 6 °
300m 10 ° 9 ° 9 ° 9 ° 10 ° 11 ° 11 ° 10 °
Valley 11 ° 10 ° 10 ° 11 ° 11 ° 13 ° 13 ° 12 °

Freezing level

0000 0300 0600 0900 1200 1500 1800 2100
Freezing level i 2,500 m 2,400 m 2,300 m 2,100 m 1,900 m 1,700 m 1,600 m 2,000 m
Sunrise: 04:51
Sunset: 21:47
Moon phase: New

Weather

Thickening cloud will bring outbreaks of rain and drizzle across the park through the early hours of Sunday. This may be heavy at times on some western facing slopes while in the east some brief drier interludes are possible. The cloudy, damp conditions are likely to continue through the morning. By afternoon it should begin to turn drier and eventually brighter from the north. Cloud bases should lift and break, allowing some sunny intervals. The evening should be fine and dry with patchy cloud and clear spells.

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

10% or less through the morning. Becoming 70 to 80% through the afternoon.

Visibility

Rain and drizzle will reduce visibility to a few kilometres. Through the morning persistent cloud above 500 meters with patches as low as 300 meters in the west leading to navigational difficulties.

Meteorologist's view

Gusts to 35 mph possible across the highest tops.

Ground conditions

No adverse ground conditions reported on 24 of Jun

Monday 26 June 2017

Sunrise: 04:51
Sunset: 21:47
Moon phase: New

Weather

Probably starting fine and dry. However cloud likely to increase through the morning, with the chance of some rain at times, although this will mainly be light and patchy in nature.

Temperature

  • At 800m Plus 7C.
  • Valley Plus 7 rising to Plus 15 C.
  • Freezing level Above the summits.

Visibility

Visibility should be good for much of the day.

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

70% at first, 40 to 50% by evening.

Maximum wind speed expected

SW 35 mph late in the day.

Tuesday 27 June 2017

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

Rain, persistent and at times heavy for much of the day. Perhaps drier later. Extensive cloud affecting hills.

Wednesday 28 June 2017

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

Some drier interludes but also the risk of some heavy rain or showers.

Thursday 29 June 2017

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

Brighter and fresher with sunny periods and a few light showers.

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.