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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for a fine day Thursday but lower with regard to timings of rain on Friday and cloud amounts thereafter.

  • Thursday
  • Friday
  • Further outlook

Thursday 19 July 2018

Weather hazards

Strong sunlight High likelihood Hide detail

Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Learn more about strong sunlight

Headline

Dry with long clear or sunny spells. Light winds

Weather

06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Sunny day Sunny day Cloudy Sunny intervals Sunny day Partly cloudy night
Chance of precipitation at 800m <05% <05% <05% <05% <05% <05%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m NW 5 6 W 7 10 W 8 12 W 10 14 W 9 13 W 9 11
600m S 4 5 W 5 8 W 7 11 W 8 13 W 7 11 SW 6 8
300m SE 3 3 W 4 7 W 6 11 W 7 12 W 5 9 SW 2 6
Valley SE 3 4 W 4 7 W 7 11 NW 7 12 NW 5 8 S 2 6

Temperature

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

Feels like temperature

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

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,800 m 2,700 m 2,600 m 2,600 m 2,300 m 2,100 m
Sunrise: 05:13
Sunset: 21:31
Moon phase: First quarter

Weather

Dry with long clear spells overnight, perhaps a few low level mist patches. Then a dry day with long spells of sunshine.

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

90% or more with only patchy cloud expected to develop above 750m.

Visibility

Around a kilometre in any early low level mist patches, otherwise very good or excellent with panoramic views of surrounding hills.

Meteorologist's view

Valley temperatures rising to 23 Celsius in places. Long spells of strong sunshine bring a significant risk of sunburn and dehydration.

Ground conditions

No recent ground conditions report available.

Friday 20 July 2018

Sunrise: 05:15
Sunset: 21:30
Moon phase: First quarter

Weather

Dry through the early hours but cloud above the summits continuing to increase. Cloud continues to thicken after dawn with outbreaks of rain and drizzle soon reaching northern hills. Rain then spreads east through the morning, perhaps turning persistent at times. This likely to gradually ease and clear during the afternoon with some brighter and drier interludes are possible in the east. However feeling noticeably cooler than recent days.

Maximum wind speed expected

Southerly or southwesterly winds increasing by dawn to 15-25mph before easing 10mph or less during the late afternoon.

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

Around 90% at dawn with little cloud below the summits but soon becoming close to zero with persistent cloud around 500m, with patches down to 300m especially in the northwest. Nearer 25% in the east with cloud mainly obscuring tops above 600m, with only patches below.

Temperature

  • At 800m Around plus 11 Celsius
  • Valley Around plus 12 Celsius at dawn rising to plus 19 Celsius in the west, but nearer plus 23 Celsius in any brighter spells in the east.
  • Freezing level Above the summits.

Visibility

Very good falling to several kilometres in rain, and perhaps a kilometre in drizzle, especially over western hills.

Saturday 21 July 2018

Sunrise: 05:16
Sunset: 21:28
Moon phase: First quarter

Rather cloudy over western hills with a little rain or drizzle at times but generally dry with some warm sunny spells in the east. Light southerly or southwesterly winds.

Sunday 22 July 2018

Sunrise: 05:18
Sunset: 21:27
Moon phase: First quarter

Similar to Saturday, rather cloudy with some rain, especially in the west with the best of any brighter or sunnier spells in the east. Mainly light southwesterly winds. Turning rather humid.

Monday 23 July 2018

Sunrise: 05:19
Sunset: 21:26
Moon phase: Waxing gibbous

Mainly dry with some good spells of very warm sunshine, especially in the east. Mainly light southwesterly 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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