Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High overall but medium to low confidence from Sunday.

Mountain hazards

Mountain weather hazards

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

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.

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.
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

Some showers possible. Lighter than recent days. Mostly dry by the afternoon.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Fog Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy (night)
Chance of
precipitation
(at 800m)
Chance of precipitation
20%
20%
10%
10%
20%
30%

Wind direction and speed

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m NW 22mph knots
NW
22mph
NW 22mph knots
NW
22mph
N 21mph knots
N
21mph
NW 19mph knots
NW
19mph
NW 18mph knots
NW
18mph
NW 17mph knots
NW
17mph
600m
600m NW 14mph knots
NW
14mph
N 17mph knots
N
17mph
N 17mph knots
N
17mph
N 16mph knots
N
16mph
NW 15mph knots
NW
15mph
NW 9mph knots
NW
9mph
300m
300m NW 10mph knots
NW
10mph
N 13mph knots
N
13mph
N 13mph knots
N
13mph
NW 13mph knots
NW
13mph
NW 11mph knots
NW
11mph
NW 5mph knots
NW
5mph
Valley
Valley NW 10mph knots
NW
10mph
N 13mph knots
N
13mph
NW 13mph knots
NW
13mph
NW 13mph knots
NW
13mph
NW 12mph knots
NW
12mph
NW 6mph knots
NW
6mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 26mph 27mph 27mph 25mph 23mph 20mph
600m
600m 18mph 22mph 23mph 22mph 20mph 13mph
300m
300m 17mph 20mph 21mph 19mph 18mph 12mph
Valley
Valley 17mph 20mph 20mph 20mph 19mph 13mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m -6 degrees Celsius -6 degrees Celsius -5 degrees Celsius -4 degrees Celsius -4 degrees Celsius -5 degrees Celsius
600m
600m -2 degrees Celsius -2 degrees Celsius 0 degrees Celsius 0 degrees Celsius 0 degrees Celsius -1 degrees Celsius
300m
300m 3 degrees Celsius 3 degrees Celsius 4 degrees Celsius 5 degrees Celsius 4 degrees Celsius 3 degrees Celsius
Valley
Valley 4 degrees Celsius 5 degrees Celsius 6 degrees Celsius 7 degrees Celsius 6 degrees Celsius 5 degrees Celsius
Freezing Level Freezing Level
1000m
800m
800m
800m
900m
900m

Additional weather information

Meteorologist's view

UV levels are moderate to high so sun protection is advised.

Weather

A few showers pushing south across the park during the morning. Turning drier and brighter into the afternoon with a chance some isolated showers returning later into the evening. Light to moderate northwesterly winds.

Chance of cloud-free hill tops

70% with a chance of cloud shrouding hill tops during showers.

Low cloud and visibility

Patchy cloud shrouding the summits first thing, lifting by the afternoon, with a chance, in isolated showers during the evening, that cloud could return to summit tops. Generally very good visibility but dropping to moderate in showers.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast