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Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for generally fine weather, particularly for Sunday, but Medium from Monday with extent of afternoon showers from Monday onwards.

  • Sunday
  • Monday
  • Further outlook

Sunday 20 May 2018

Weather hazards

Strong sunlight Medium 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

Fine, dry and bright with good visibility and relatively light winds.

Weather

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

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m S 21 26 S 20 25 S 17 23 SW 14 20 SW 12 16 SE 10 13
600m S 16 21 S 15 21 S 15 22 SW 13 19 SW 11 15 S 8 10
300m S 9 17 S 9 18 S 9 20 S 8 17 S 6 12 S 3 5
Valley S 9 18 S 9 17 S 9 19 S 8 16 S 5 11 S 3 5

Temperature

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

Feels like temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 4 ° 5 ° 7 ° 8 ° 8 ° 8 °
600m 6 ° 8 ° 10 ° 10 ° 10 ° 10 °
300m 9 ° 12 ° 14 ° 14 ° 14 ° 12 °
Valley 10 ° 13 ° 15 ° 16 ° 14 ° 12 °

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 1,900 m 1,900 m 1,900 m 1,900 m 2,000 m 2,000 m
Sunrise: 05:11
Sunset: 21:16
Moon phase: Waxing crescent

Weather

Another dry day, but not as sunny as Saturday with higher cloud increasing from the northwest during the morning, lingering throughout the afternoon and evening. However bases will be largely above the summits, and the cloud will be thin enough to afford plenty of hazy sunshine still, bringing a significant sunburn risk.

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

80-90% with only some patchy cloud sporadically across the higher tops.

Visibility

Good or very good

Meteorologist's view

Sunshine bringing significant risk of sunburn and dehydration. Still rather cool on peaks in sometimes strong winds.

Ground conditions

No recent ground conditions report available. For archived reports see - http://www.snowdonia.gov.wales/visiting/walking/ground-conditions

Monday 21 May 2018

Sunrise: 05:09
Sunset: 21:17
Moon phase: First quarter

Weather

Chance of isolated early fog patches around the foothills for a time around dawn. The vast majority will stay dry and enjoy further sunny spells, but the odd afternoon sharp shower may develop later, possibly thundery.

Maximum wind speed expected

North of Northeast 10mph or less.

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

80% with only some patchy cloud sporadically across the higher tops during the afternoon.

Temperature

  • At 800m Plus 8C rising 14C for a time during the afternoon
  • Valley Plus 8C rising 20C during the afternoon, before falling 14C late evening
  • Freezing level 2000m

Visibility

Good or very good.

Tuesday 22 May 2018

Sunrise: 05:08
Sunset: 21:19
Moon phase: First quarter

A sunny day and remaining largely dry. An isolated afternoon shower is just possible. Summit winds light easterly with freezing level well above all peaks.

Wednesday 23 May 2018

Sunrise: 05:07
Sunset: 21:20
Moon phase: First quarter

Another fine, sunny day with most staying dry, but again a chance of the odd afternoon shower. Summit winds light or moderate easterly with freezing level well above peaks.

Thursday 24 May 2018

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

Largely dry and often sunny with sunshine and summit breezes light or moderate easterly. Still rather cool on peaks, warmer in valleys.

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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