Mountain weather

Mountain weather

Eryri / Snowdonia

Confidence

High for over unsettled nature of the weather, but lower for rain and low cloud details for Saturday.

Mountain hazards

Mountain weather hazards

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

Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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, these turning heavy at times.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Light rain Light rain Heavy Rain Light rain Heavy Rain Light rain
Chance of
precipitation
(at 800m)
Chance of precipitation
20%
60%
80%
60%
90%
40%

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 14mph knots
SW
14mph
SW 14mph knots
SW
14mph
SW 16mph knots
SW
16mph
SW 18mph knots
SW
18mph
W 20mph knots
W
20mph
W 20mph knots
W
20mph
600m
600m S 10mph knots
S
10mph
SW 11mph knots
SW
11mph
SW 14mph knots
SW
14mph
SW 14mph knots
SW
14mph
SW 12mph knots
SW
12mph
W 11mph knots
W
11mph
300m
300m S 5mph knots
S
5mph
SW 7mph knots
SW
7mph
SW 10mph knots
SW
10mph
SW 10mph knots
SW
10mph
SW 7mph knots
SW
7mph
W 7mph knots
W
7mph
Valley
Valley S 5mph knots
S
5mph
SW 7mph knots
SW
7mph
SW 9mph knots
SW
9mph
W 9mph knots
W
9mph
SW 7mph knots
SW
7mph
W 7mph knots
W
7mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m 16mph 17mph 21mph 24mph 24mph 24mph
600m
600m 13mph 15mph 18mph 19mph 16mph 15mph
300m
300m 10mph 12mph 15mph 17mph 13mph 14mph
Valley
Valley 10mph 12mph 14mph 15mph 13mph 15mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
900m
900m -3 degrees Celsius -2 degrees Celsius -1 degrees Celsius 0 degrees Celsius -1 degrees Celsius -2 degrees Celsius
600m
600m 1 degrees Celsius 1 degrees Celsius 2 degrees Celsius 3 degrees Celsius 3 degrees Celsius 2 degrees Celsius
300m
300m 5 degrees Celsius 5 degrees Celsius 6 degrees Celsius 7 degrees Celsius 7 degrees Celsius 6 degrees Celsius
Valley
Valley 6 degrees Celsius 7 degrees Celsius 8 degrees Celsius 9 degrees Celsius 9 degrees Celsius 8 degrees Celsius
Freezing Level Freezing Level
1100m
1300m
1600m
1600m
1500m
1400m

Additional weather information

Meteorologist's view

Rainfall combined with low cloud are expected to reduce visibility on exposed terrain, with saturated surfaces increasing the risk of slips and difficult footing.

Weather

Largely dry but cloudy start, but outbreaks of light rain will arrive from the west by mid-morning and then become heavy at times. This evening the rain moves away east, with largely cloudy conditions and isolated showers following.

Chance of cloud-free hill tops

60% until midday, then decreasing to 10%. Improving 80% this evening.

Low cloud and visibility

Cloud base dropping by midday to around 700-800m, with occasional patches of cloud possible 600-700m. Good visibility to start but becoming hazy to poor in low cloud and rain.

Ground conditions

Please see - https://yrwyddfa.live/

Summit specific forecast