Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High.

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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.

Mountain weather forecast

Another dry and settled day with sunny spells.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Cloudy Cloudy Sunny Sunny Sunny Clear night
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 NW 7mph knots
NW
7mph
NW 7mph knots
NW
7mph
N 9mph knots
N
9mph
N 11mph knots
N
11mph
N 9mph knots
N
9mph
N 8mph knots
N
8mph
600m
600m N 7mph knots
N
7mph
N 7mph knots
N
7mph
N 10mph knots
N
10mph
N 11mph knots
N
11mph
N 9mph knots
N
9mph
N 6mph knots
N
6mph
300m
300m NW 5mph knots
NW
5mph
NW 5mph knots
NW
5mph
N 9mph knots
N
9mph
N 10mph knots
N
10mph
N 8mph knots
N
8mph
NW 4mph knots
NW
4mph
Valley
Valley NW 5mph knots
NW
5mph
NW 5mph knots
NW
5mph
N 9mph knots
N
9mph
N 10mph knots
N
10mph
N 8mph knots
N
8mph
NW 4mph knots
NW
4mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 9mph 8mph 12mph 15mph 13mph 11mph
600m
600m 9mph 9mph 14mph 15mph 12mph 8mph
300m
300m 7mph 7mph 12mph 14mph 12mph 6mph
Valley
Valley 7mph 7mph 12mph 14mph 12mph 6mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 6 degrees Celsius 8 degrees Celsius 11 degrees Celsius 11 degrees Celsius 11 degrees Celsius 10 degrees Celsius
600m
600m 8 degrees Celsius 10 degrees Celsius 13 degrees Celsius 13 degrees Celsius 13 degrees Celsius 13 degrees Celsius
300m
300m 11 degrees Celsius 13 degrees Celsius 16 degrees Celsius 16 degrees Celsius 16 degrees Celsius 14 degrees Celsius
Valley
Valley 12 degrees Celsius 14 degrees Celsius 17 degrees Celsius 17 degrees Celsius 17 degrees Celsius 15 degrees Celsius
Freezing Level Freezing Level
2600m
2900m
3000m
2800m
2600m
2700m

Additional weather information

Meteorologist's view

A great day to enjoy the National Park, with plenty of dry weather and sunny spells expected. UV levels will be high, so appropriate sun protection is recommended. Temperatures will also be warm, and visitors should ensure they stay well hydrated throughout the day.

Weather

Another dry and sunny day, skies turning a little hazy at times. Generally light winds.

Chance of cloud-free hill tops

>95%

Low cloud and visibility

Some mist and fog in prone valleys overnight. This clearing quickly around dawn. Otherwise little to no low cloud and excellent visibilities across the park.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast