Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High for a settled weekend with winds gradually easing. Moderate to low in terms of rain and shower details next week.

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.

Mountain weather forecast

Dry but rather cloudy and breezy. Warm.

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

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 32mph knots
W
32mph
W 27mph knots
W
27mph
W 25mph knots
W
25mph
W 25mph knots
W
25mph
W 20mph knots
W
20mph
W 21mph knots
W
21mph
600m
600m W 23mph knots
W
23mph
W 21mph knots
W
21mph
W 20mph knots
W
20mph
W 20mph knots
W
20mph
W 16mph knots
W
16mph
W 11mph knots
W
11mph
300m
300m W 16mph knots
W
16mph
W 16mph knots
W
16mph
W 16mph knots
W
16mph
W 14mph knots
W
14mph
W 10mph knots
W
10mph
W 5mph knots
W
5mph
Valley
Valley W 16mph knots
W
16mph
W 16mph knots
W
16mph
W 16mph knots
W
16mph
W 15mph knots
W
15mph
W 10mph knots
W
10mph
W 6mph knots
W
6mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 38mph 33mph 32mph 32mph 26mph 25mph
600m
600m 28mph 27mph 27mph 27mph 21mph 15mph
300m
300m 25mph 25mph 24mph 23mph 16mph 11mph
Valley
Valley 25mph 25mph 24mph 23mph 16mph 12mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m -2 degrees Celsius -1 degrees Celsius 1 degrees Celsius 2 degrees Celsius 3 degrees Celsius 2 degrees Celsius
600m
600m 2 degrees Celsius 3 degrees Celsius 5 degrees Celsius 6 degrees Celsius 7 degrees Celsius 6 degrees Celsius
300m
300m 7 degrees Celsius 7 degrees Celsius 9 degrees Celsius 10 degrees Celsius 11 degrees Celsius 10 degrees Celsius
Valley
Valley 8 degrees Celsius 9 degrees Celsius 10 degrees Celsius 11 degrees Celsius 12 degrees Celsius 11 degrees Celsius
Freezing Level Freezing Level
1500m
1700m
1800m
1700m
1700m
1900m

Additional weather information

Meteorologist's view

Expect mean winds and gusts to be around 10 mph stronger than those in the table above on some ridges and over the highest summits. These winds will give considerable buffeting and making walking difficult at times. Despite it feeling quite chilly on the highest summits, very high UV levels are expected through the middle of the day, so sun protection should be considered.

Weather

A dry but rather cloudy start to the weekend. Cloud will become more extensive through the morning and persist for much of the day, though tending to lift into brighter layers. Breezy at lower levels, but windy over summits.

Chance of cloud-free hill tops

80% rapidly becoming 100%..

Low cloud and visibility

Periods of cloud above 750-800m first thing, mainly over and to the west of the Snowdon Range. This lifting and breaking to become patches above 950m from mid-morning with most summits clearing by midday. Generally very good visibility with excellent air clarity and distant views of far-away mountains and landmarks but occasionally very poor in cloud/hill fog.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast