Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for overall settled conditions with prolonged sunshine by day. Moderate for exact timing of cloud clearance each morning. Low confidence in the timing and distribution of showers over the weekend.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Strong Sunlight
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.

hazard Poor Visibility
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.

Mountain weather forecast

Early cloud clearing once again to widespread sunshine.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Cloudy Sunny intervals Sunny day Sunny day Sunny day Clear night
Chance of precipitation
(at 800m)
10% <05% 00% 00% 00% 00%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m E
18
E
18
E
17
E
18
E
19
E
22
600m E
16
E
16
E
13
E
13
E
13
E
14
300m E
13
E
13
E
11
E
11
E
10
E
11
Valley E
13
E
13
E
11
E
11
E
10
E
11
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m 24 23 22 23 25 31
600m 22 21 18 18 21 25
300m 21 19 17 18 19 23
Valley 21 19 18 18 18 23

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
11°
12°
600m
12°
14°
14°
12°
300m
12°
15°
17°
17°
14°
Valley
13°
16°
18°
18°
14°
Freezing Level
2,000m
1,900m
1,900m
1,900m
2,000m
2,000m

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
-3°
600m
11°
12°
300m
13°
15°
15°
12°
Valley
10°
14°
16°
16°
12°

Additional weather information

Meteorologist's view

High UV levels likely, with sun protection essential. Care should also be taken if heading out onto the hills early, with temperatures at height feeling cold in the fresh easterly winds, adequate layers recommended.

Weather

A cloudy start to the day but the cloud will soon thin and break, followed by periods of sunshine developing by mid-morning. Warm and dry with lots of very strong sunshine during the afternoon. Holding onto clear skies for the first part of the night, with some late evening sunshine but low cloud likely to return from the east later overnight.

Chance of cloud-free hill tops

40% in the east of the park to start, 80% in the west. Becoming 95% for all parts into the afternoon.

Low cloud and visibility

Generally good but mediocre or poor in cloud, with bases as low as 600-700m, covering tops in the east of the park around dawn. Visibility soon becoming very good all around, with good panoramic views, including at height.

Ground conditions

Please see - https://snowdonia.gov.wales/visit/snowdon/yr-wyddfa-ground-conditions-reports/

Sunrise:
Sunset:

Mountain weather information

Weather

Staying dry, with again some early cloud in the east clearing and breaking to give widespread sunshine into the afternoon, tempered by a fresh easterly breeze.

Chance of cloud-free hill tops

60% in the east to start, becoming 95% for all into the afternoon.

Maximum wind speed expected

Easterly 15-20mph gusting 25-30mph.

Temperature

  • At 800m 5 deg C becoming 13 deg C.
  • Valley 8 deg C becoming 20 deg C.
  • Freezing level Above summits.

Low cloud and visibility

Cloud bases of around 600-700m once again covering some higher tops in the east of the park to start. Cloud increasingly breaking through the morning to leave largely clear skies by the afternoon. Visibility generally good outside of any early cloud at height.

Mountain weather information

Fri 9 Jun

Sunrise:
Sunset:

Similar to previous days, with patchy overnight cloud soon clearing to leave another dry sunny day. Brisk easterly winds persisting.

Sat 10 Jun

Sunrise:
Sunset:

A dry start likely but forecast confidence lowers as conditions turn more unsettled into the afternoon, with an increasing risk of some heavy and thundery showers. Becoming warmer with winds easing.

Sun 11 Jun

Sunrise:
Sunset:

Forecast confidence remains lower but a generally cloudier day likely with a risk of showers. Staying warm with light winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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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 Yr Wyddfa (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 Yr Wyddfa's (Snowdon) 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.