Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High confidence for a generally unsettled theme over the next few days, but lower confidence in the exact details of cloud and precipitation.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

hazard 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 cloudy day with light rain or showers at times. Dry into the evening.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Cloudy Light rain Cloudy Light rain Cloudy Partly cloudy (night)
Chance of precipitation
(at 800m)
20% 30% 20% 30% 20% <05%

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

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
10°
10°
10°
600m
10°
11°
12°
12°
12°
11°
300m
12°
13°
14°
14°
15°
12°
Valley
13°
15°
16°
16°
16°
14°
Freezing Level
2,300m
2,400m
2,400m
2,500m
2,400m
2,400m

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

Additional weather information

Meteorologist's view

Generally a dull day, but some brighter spells later in the afternoon along with moderate UV levels, mean hikers should still pack adequate sun protection.

Weather

Generally cloudy, with cloud increasing through the morning, bringing with it the threat of some light rain or showers. These dying away through the mid-afternoon to give a dry but cloudy evening, with the best of any clearer spells developing around this time.

Chance of cloud-free hill tops

20% gradually becoming 90% during the day.

Low cloud and visibility

Cloud shrouding some higher peaks for a time in the few hours after dawn before lifting (bases around 800m). Staying overcast through the day, although there does remain the chance for some higher peaks to become briefly covered in cloud at times, usually associated with any rain or showers. Visibility will generally be good, dropping to poor in low cloud and precipitation.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Clear spells overnight may see some mist and fog in the valleys, although this soon lifting and breaking. A bright start through the morning, before an area of rain and showers pushes up from the south during the afternoon, bringing with it the risk of heavy bursts, hail and thunder at times.

Chance of cloud-free hill tops

90%

Maximum wind speed expected

Southeasterly 12-17mph, gusting to 25mph in showers.

Temperature

  • At 800m Plus 7 degrees Celsius, rising to 11 degrees Celsius.
  • Valley Plus 12 degrees Celsius, rising to 18 degrees Celsius.
  • Freezing level Above summits.

Low cloud and visibility

Any early valley fog will quickly lift and break, with high cloud through the morning giving plenty of bright spells. Some lower cloud likely through the afternoon in association with heavy showers, likely leading to some higher peaks being shrouded at times. Visibility good to very good through the morning, but likely deteriorating quickly in heavier showers.

Mountain weather information

Tue 16 Jul

Sunrise:
Sunset:

Showers and sunny spells on Tuesday, possibly heavy and thunder at times. Fresh northwesterly winds.

Wed 17 Jul

Sunrise:
Sunset:

After a dry and bright start a band of cloud and occasionally heavy rain will move in from the west. Strengthening southerly winds.

Thu 18 Jul

Sunrise:
Sunset:

Generally a drier day but staying cloudy. Strong southwesterly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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