Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High for the general story with a strong south-westerly airstream on Friday then for drier and brighter day on Saturday. Confidence becomes low for details from Monday.

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.

Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Mountain weather forecast

Cloudy with outbreaks of rain. Windy with gales on high slopes and ridges.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Light rain Heavy rain showers Light rain showers Sunny intervals Light rain showers Heavy Rain
Chance of
precipitation
(at 800m)
Chance of precipitation
70%
60%
60%
30%
40%
60%

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 SW 37mph knots
SW
37mph
SW 38mph knots
SW
38mph
SW 43mph knots
SW
43mph
SW 46mph knots
SW
46mph
SW 45mph knots
SW
45mph
SW 42mph knots
SW
42mph
600m
600m S 26mph knots
S
26mph
SW 28mph knots
SW
28mph
S 30mph knots
S
30mph
SW 32mph knots
SW
32mph
SW 31mph knots
SW
31mph
SW 30mph knots
SW
30mph
300m
300m S 12mph knots
S
12mph
S 16mph knots
S
16mph
S 19mph knots
S
19mph
S 20mph knots
S
20mph
SW 19mph knots
SW
19mph
SW 18mph knots
SW
18mph
Valley
Valley S 12mph knots
S
12mph
S 16mph knots
S
16mph
S 18mph knots
S
18mph
S 20mph knots
S
20mph
SW 18mph knots
SW
18mph
SW 17mph knots
SW
17mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 43mph 45mph 52mph 56mph 55mph 52mph
600m
600m 31mph 34mph 39mph 42mph 41mph 39mph
300m
300m 24mph 29mph 34mph 37mph 36mph 34mph
Valley
Valley 24mph 29mph 33mph 36mph 35mph 32mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 5 degrees Celsius 5 degrees Celsius 5 degrees Celsius 5 degrees Celsius 4 degrees Celsius 5 degrees Celsius
600m
600m 8 degrees Celsius 8 degrees Celsius 7 degrees Celsius 7 degrees Celsius 7 degrees Celsius 8 degrees Celsius
300m
300m 11 degrees Celsius 12 degrees Celsius 11 degrees Celsius 11 degrees Celsius 11 degrees Celsius 11 degrees Celsius
Valley
Valley 13 degrees Celsius 13 degrees Celsius 13 degrees Celsius 13 degrees Celsius 12 degrees Celsius 12 degrees Celsius
Freezing Level Freezing Level
2600m
2600m
2600m
2600m
2600m
2700m

Additional weather information

Meteorologist's view

A very windy day with gusts of 50 to 60mph on the high ridges and summits. This brings a high risk of being blown off balance so careful route choice will be required. Combined with frequent rain, the day will feel cold so layers and full waterproofs are advisable.

Weather

A largely cloudy day with outbreaks of rain, briefly heavy at times although brief drier spells are possible, mainly during the afternoon. A longer spell of heavy rain will develop during the evening. Strong and gusty winds, reaching gale force over the summits..

Chance of cloud-free hill tops

Mainly 60%, but 30% early morning, then again in the evening.

Low cloud and visibility

Mainly good visibility during the day, briefly falling moderate to poor in rain. Some early cloud and fog affecting slopes above about 500m, this lifting to around 900m through the morning before lowering in the evening.

Ground conditions

No recent ground conditions report available.

Summit specific forecast