Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for the general situation, but moderate for cloud details on Tuesday.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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.

Mountain weather forecast

Cloudy with rain initially, improving later.

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

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m N
13
N
10
NW
9
NW
10
NW
6
W
6
600m N
6
N
8
N
9
NW
9
NW
6
W
4
300m N
5
NW
6
N
8
NW
8
NW
4
W
2
Valley N
5
NW
6
NW
8
NW
8
NW
5
W
3
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m 16 13 13 14 9 7
600m 10 12 14 14 8 6
300m 11 9 12 13 7 4
Valley 11 10 13 14 8 4

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
10°
10°
11°
12°
11°
11°
600m
12°
12°
14°
14°
14°
12°
300m
14°
14°
16°
17°
16°
14°
Valley
15°
15°
17°
17°
17°
14°
Freezing Level
2,700m
2,600m
2,500m
2,500m
2,400m
2,400m

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
10°
10°
10°
600m
11°
11°
12°
12°
13°
12°
300m
13°
14°
15°
16°
16°
14°
Valley
14°
15°
16°
16°
17°
14°

Additional weather information

Meteorologist's view

Improving conditions through the day with the best of any weather through the afternoon, though sun protection advised for later in the day.

Weather

Extensive low cloud with outbreaks of rain or showers at first. Cloud breaking up during the morning, becoming dry into the afternoon with some sunny spells developing.

Chance of cloud-free hill tops

30% becoming 90% by midday.

Low cloud and visibility

Widespread cloud base 300-400m at first, this lifting and breaking mostly above the summits by midday. Visibility moderate to very poor in rain and low cloud at first, becoming good or very good in the afternoon.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Bright or sunny spells to start the day, turning increasingly cloudy from the west through the morning. Chance of a little rain during the afternoon but dry for the most part. A chance of some light rain or drizzle in the evening.

Chance of cloud-free hill tops

90% becoming 60% through the morning.

Maximum wind speed expected

Light variable winds becoming southerly 10-15 mph later.

Temperature

  • At 800m Plus 7 Celsius, rising to 12 Celsius.
  • Valley Plus 12 Celsius, rising to 18 Celsius.
  • Freezing level Above summits.

Low cloud and visibility

Cloud developing and moving east, with bases lowering to 700-800m during the morning. Visibility generally good, temporary reductions in rain.

Mountain weather information

Thu 25 Jul

Sunrise:
Sunset:

Outbreaks of rain pushing eastwards, turning heavy for a time before clearing later. Moderate south to southwesterly winds.

Fri 26 Jul

Sunrise:
Sunset:

A mix of sunshine and showers on Friday. Moderate west to southwesterly winds.

Sat 27 Jul

Sunrise:
Sunset:

Further showers or longer spells of rain on Saturday. Moderate to strong westerly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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