Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High for the changeable story throughout the next few days.

Sunrise: Sunset:
Sunrise: Sunset:
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.

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

A dry and bright morning. Showers then moving in throughout the afternoon and evening.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Sunny intervals Sunny intervals Heavy rain showers Heavy rain showers Heavy rain showers Light rain showers (night)
Chance of
precipitation
(at 800m)
Chance of precipitation
20%
20%
40%
60%
60%
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 W 24mph knots
W
24mph
W 26mph knots
W
26mph
W 30mph knots
W
30mph
W 31mph knots
W
31mph
W 33mph knots
W
33mph
NW 36mph knots
NW
36mph
600m
600m SW 14mph knots
SW
14mph
W 19mph knots
W
19mph
W 21mph knots
W
21mph
W 23mph knots
W
23mph
W 21mph knots
W
21mph
NW 22mph knots
NW
22mph
300m
300m SW 7mph knots
SW
7mph
W 13mph knots
W
13mph
W 15mph knots
W
15mph
W 17mph knots
W
17mph
W 14mph knots
W
14mph
NW 14mph knots
NW
14mph
Valley
Valley SW 7mph knots
SW
7mph
W 13mph knots
W
13mph
W 15mph knots
W
15mph
W 17mph knots
W
17mph
W 14mph knots
W
14mph
NW 14mph knots
NW
14mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 28mph 31mph 36mph 39mph 40mph 43mph
600m
600m 18mph 23mph 26mph 29mph 27mph 28mph
300m
300m 17mph 21mph 24mph 28mph 25mph 26mph
Valley
Valley 17mph 21mph 24mph 28mph 25mph 26mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 1 degrees Celsius 0 degrees Celsius 1 degrees Celsius 2 degrees Celsius 2 degrees Celsius 0 degrees Celsius
600m
600m 6 degrees Celsius 5 degrees Celsius 5 degrees Celsius 6 degrees Celsius 6 degrees Celsius 5 degrees Celsius
300m
300m 10 degrees Celsius 9 degrees Celsius 9 degrees Celsius 10 degrees Celsius 10 degrees Celsius 9 degrees Celsius
Valley
Valley 11 degrees Celsius 11 degrees Celsius 11 degrees Celsius 12 degrees Celsius 11 degrees Celsius 10 degrees Celsius
Freezing Level Freezing Level
1600m
1600m
2000m
1800m
1800m
1700m

Additional weather information

Meteorologist's view

Moderate levels of UV are expected although some extra layers maybe required at height as it will be feeling rather cold in the wind. Waterproofs necessary later.

Weather

Tuesday morning will start on a largely dry and bright note although some low cloud may linger in places for a time. A scattering of showers then developing from lunchtime being blown in on a brisk westerly to northwesterly wind, some of these may be heavy

Chance of cloud-free hill tops

70%.

Low cloud and visibility

Patchy cloud bases around 800-1000m through the day, otherwise above most summits. Moderate to poor visibility in any or showers, and very poor in low cloud across the peaks, but otherwise excellent.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast