Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for a trend away from unsettled and showery conditions to something more benign by the weekend. Low for shower details.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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.
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 Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Mountain weather forecast

Cloudy with rain in the morning, clearing to see some sunshine in the afternoon with a risk of showers.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Fog Fog Cloudy Sunny intervals Sunny intervals Partly cloudy (night)
Chance of precipitation
(at 800m)
50% 40% 20% 20% 10% <05%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m NW
32
NW
31
N
24
N
25
N
27
N
25
600m NW
23
N
23
N
19
N
19
N
19
N
16
300m NW
16
NW
17
NW
15
N
15
N
13
N
11
Valley NW
16
NW
18
NW
14
NW
14
NW
14
NW
11
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m 38 40 32 34 36 33
600m 28 32 27 27 27 23
300m 26 29 25 25 24 21
Valley 26 30 25 25 25 21

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
10°
300m
10°
11°
12°
11°
10°
Valley
10°
11°
12°
13°
13°
11°
Freezing Level
1,800m
1,900m
1,900m
1,900m
1,900m
2,000m

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

Additional weather information

Meteorologist's view

A day for layers, including waterproofs. Brightening conditions in the afternoon may bring moderate UV levels, so consider sun protection. Feeling chilly on the higher summits.

Weather

A rather cloudy start to the day with patchy light rain on northern upslopes gradually clearing during the morning, with some sunny spells developing, mainly in the south of the Park. Perhaps some isolated light showers in the afternoon but easing later in the day. Windy.

Chance of cloud-free hill tops

20% in the morning, becoming 40% in the north by the afternoon and 70% in the south.

Low cloud and visibility

Areas of cloud covering hills above 400-600m in the morning. By the afternoon, cloud bases will lift and break to see some sunny spells with bases lifting to near the higher summits. Perhaps some lower cloud bases grazing the hills above 600m in the north. Mostly very good visibility, becoming moderate or poor in rain and very poor in low cloud covering the hills.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Any mist or low cloud at first lifting and clearing to bring a fine, dry day with plenty of sunshine. The risk of strong sunlight is high.

Chance of cloud-free hill tops

30% at dawn, becoming greater than 95% during the morning.

Maximum wind speed expected

Northerly 15-20 mph gusting 30-35mph.

Temperature

  • At 800m Plus 7 Celsius.
  • Valley Plus 8 Celsius becoming Plus 15 Celsius.
  • Freezing level Above summits.

Low cloud and visibility

Cloud bases down to 300m at first, this clearing during the morning to see small amounts of cloud, with the bases all well above the summits.

Mountain weather information

Sat 1 Jun

Sunrise:
Sunset:

Dry with sunny spells, feeling warm in the sunshine. Freezing levels well above summits. Gentle northerly winds.

Sun 2 Jun

Sunrise:
Sunset:

Another dry day with a good deal of sunny spells. Freezing levels above summits. Gentle northwesterly winds.

Mon 3 Jun

Sunrise:
Sunset:

Staying largely dry, perhaps cloudier than the previous days. Freezing levels well above summits. Light to moderate northwesterly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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