Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High confidence for early morning rain clearing, lower confidence on exact timing of clearance. Moderate confidence regarding intensity of afternoon showers.

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.
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.
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

Potentially still wet and windy early morning. Rain clearing with blustery showers by the afternoon.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Light rain Sunny intervals Heavy rain showers Heavy rain showers Heavy rain showers Heavy rain showers (night)
Chance of
precipitation
(at 800m)
Chance of precipitation
60%
10%
40%
40%
40%
70%

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 S 32mph knots
S
32mph
S 31mph knots
S
31mph
S 34mph knots
S
34mph
S 32mph knots
S
32mph
S 30mph knots
S
30mph
S 25mph knots
S
25mph
600m
600m S 21mph knots
S
21mph
S 22mph knots
S
22mph
S 25mph knots
S
25mph
S 24mph knots
S
24mph
S 18mph knots
S
18mph
S 16mph knots
S
16mph
300m
300m S 13mph knots
S
13mph
S 15mph knots
S
15mph
S 18mph knots
S
18mph
S 17mph knots
S
17mph
S 13mph knots
S
13mph
S 10mph knots
S
10mph
Valley
Valley S 12mph knots
S
12mph
S 14mph knots
S
14mph
S 17mph knots
S
17mph
S 17mph knots
S
17mph
S 12mph knots
S
12mph
S 9mph knots
S
9mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 39mph 40mph 44mph 42mph 38mph 32mph
600m
600m 28mph 30mph 34mph 33mph 25mph 22mph
300m
300m 24mph 27mph 32mph 30mph 23mph 19mph
Valley
Valley 22mph 25mph 30mph 29mph 22mph 17mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 4 degrees Celsius 5 degrees Celsius 5 degrees Celsius 5 degrees Celsius 3 degrees Celsius 3 degrees Celsius
600m
600m 8 degrees Celsius 8 degrees Celsius 8 degrees Celsius 8 degrees Celsius 7 degrees Celsius 6 degrees Celsius
300m
300m 11 degrees Celsius 12 degrees Celsius 12 degrees Celsius 12 degrees Celsius 10 degrees Celsius 10 degrees Celsius
Valley
Valley 13 degrees Celsius 14 degrees Celsius 13 degrees Celsius 13 degrees Celsius 12 degrees Celsius 12 degrees Celsius
Freezing Level Freezing Level
2400m
1900m
2200m
2000m
2100m
1900m

Additional weather information

Meteorologist's view

Early morning low cloud and rain will likely make for some challenging navigation conditions, with paths still wet and slippery from persistent overnight rain. Conditions quickly improving as the morning progresses. Worth being wary of afternoon showers as these could be heavy with thunder and possibly some hail.

Weather

Early morning rain should quickly clear if not already done so. A breezy day to follow, with sunny spells and showers developing by the afternoon, some may be heavy at times carrying the risk of thunder and possibly some hail mixed in. Showers becoming more persistent by late evening.

Chance of cloud-free hill tops

40% early morning, becoming 80% by mid-morning.

Low cloud and visibility

Low cloud down to 400-500m first thing, dropping in heavier bursts of rain, otherwise rising mostly at or above summits by mid-morning. Poor visibility during the morning then very good, although may deteriorate temporarily in afternoon showers.

Ground conditions

No recent ground conditions report available.

Summit specific forecast