Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Mostly dry, partly cloudy
Dry most or all day. Variable cloud banks drifting over the mountains, some slopes clearing at times, a little sun may break through locally.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Click an icon for more information or click here for a key to all icons.
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Mostly dry, partly cloudy
Dry most or all day. Variable cloud banks drifting over the mountains, some slopes clearing at times, a little sun may break through locally.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 11th December 2024
Last updated
Tue 10th Dec 24 at
3:45PM
Summary for all mountain areas
Sunshine and little wind for Scotland, some areas of low-level fog; extensive snow cover over the mountains. Above an inversion, air temperature on tops above freezing, but hard frost into the glens. A chilly easterly breeze for England and Wales; sunshine best near west coasts, cloudier eastwards.
Headline for Eryri / Snowdonia National Park
Chilly gusty wind. Cloudy but dry, some sun west.
How windy? (On the summits)
Easterly 20-25mph, gusty around higher summits and elevated passes, over 30mph especially mid-Wales.
Effect of the wind on you?
Breezy over higher slopes, may affect balance on exposed ridges, marked wind chill.
How Wet?
Very likely dry
Cloud on the hills?
Capping some tops at times
Cloud banks drifting over some eastern hills and may come and go on tops around Carneddau above 700m. Patches occasionally further west, but hills often clear.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sunshine best toward west, cloudier east. Visibility very good.
How Cold? (at 900m)
Near 0C, although some western slopes a degree or so warmer. Feeling like -8C in the wind.
Freezing Level
800-900m, rime forming on higher slopes.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 12th December 2024
Last updated
Tue 10th Dec 24 at
3:45PM
How windy? (On the summits)
East to southeasterly 15 to 20mph, locally 25mph some slopes mainly toward mid-Wales.
Effect of the wind on you?
Fairly small, occasionally gusty on some slopes.
How Wet?
Largely dry
Possible fine drizzle on some slopes, mainly toward east.
Cloud on the hills?
Risk extensive fog
Fog likely shrouding the hills widely from lower slopes upwards, particularly eastern areas. Toward west, cloud base higher on the hills, chance of some tops at times between fog banks.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Cloudy, risk widely misty over the hills, some sun occasionally toward west, visibility good below cloud near coast.
How Cold? (at 900m)
3C (small variation with height).
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 13th December 2024
Last updated
Tue 10th Dec 24 at
3:45PM
How windy? (On the summits)
Variable or southerly 5-10mph or less.
Effect of the wind on you?
Negligible
How Wet?
Feeling damp
Damp air where in cloud. Local pockets of steadier drizzle.
Cloud on the hills?
Extensive
Shrouding the hills widely with banks of cloud at various elevations, typically lowest east Wales. Higher bases and some breaks possible toward north.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast and dull much of region, glimpses of sun possibly toward coast in north. Hazy or misty most areas.
How Cold? (at 900m)
1C.
Freezing Level
Near freezing point on higher slopes.
Planning Outlook
High pressure weakens beyond midweek, allowing fog banks to drift higher up on the hills, local pockets of drizzle forming. As the inversion situation fades, temperatures will fall back to freezing on higher terrain by Friday and Saturday; some snow flurries as northwesterly winds develop. Stronger westerly winds by Sunday, severe gales likely at least on Scottish mountains. Milder for a few days Sunday into early next week with thawing, rain focused on western Scotland, low cloud widely on western hills. Varied temperatures later next week, but greater uncertainty of weather detail by then. Indications favour higher pressure returning toward the Christmas period.