Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 7th December 2025
Last updated
Sat 6th Dec 25 at
4:18PM
Summary for all mountain areas
Patchy rain in western areas early, drier east though lots of cloud over summits; some clear tops central and south Pennines. Winds soon begin to strengthen widely, quickest in Wales and reaching gale force here afternoon. Rain also arrives from the west afternoon, spreading widely into evening.
Headline for Eryri / Snowdonia National Park
Blustery, afternoon gales with rain setting in
How windy? (On the summits)
Southerly 15-25mph from dawn, soon strengthening, reaching 35-45mph around dusk with a west-southwesterly trend (some variability); gusts reaching 50mph+ for a time around and after dusk.
Effect of the wind on you?
Conditions soon deteriorate to strenuous walking over higher terrain, further deteriorating with a risk of difficult conditions and challenging mobility later. Significant wind chill.
How Wet?
Patchy rain, spreading widely afternoon, heavy west
Occasional patches of rain drifting from the west in the morning. Some drizzle on the high tops, then rain sets in more widely through afternoon into evening with heavy falls on western slopes.
Cloud on the hills?
Extensive
Shrouding the hills widely, with banks of cloud from low to mid elevations upward. Highest bases north/east of Ogwen valley though bases unlikely to rise above 700m during higher breaks.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Generally cloudy and misty, poor visibility likely most hills, locally better northeast.
How Cold? (at 900m)
7C, little change with height above 600m. Dropping rapidly from dusk into night to around 5C. Feeling below freezing in the wind, near -5C if speeds increase.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 8th December 2025
Last updated
Sat 6th Dec 25 at
4:18PM
How windy? (On the summits)
Southwesterly 35-50mph from dawn, easing to 30-35mph through morning where speeds likely to remain.
Effect of the wind on you?
Strenuous walking with buffeting in exposure all day, arduous over the summits early. Considerable wind chill.
How Wet?
Rain on and off, most early
Showery rain in the morning, tending to fade, through risk lingering on western slopes well into the day with odd broader areas of rain passing.
Cloud on the hills?
Varied, mostly higher western areas
Frequently capping higher slopes in Snowdon group and near to Cardigan Bay, bases varied 600-900m; better breaks north/eastward though risk filling in for periods.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little sun expected, only weak glimpses east Wales. Visibility good where dry, but reduced for periods in showers.
How Cold? (at 900m)
4 or 5C, a slow rise as the day goes. If exposed to stronger winds, risk feeling like -8C on high tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 9th December 2025
Last updated
Sat 6th Dec 25 at
4:18PM
How windy? (On the summits)
South-southwesterly 55-65mph, gusts reaching 75mph. Easing into nighttime, trending southwesterly.
Effect of the wind on you?
Widely difficult conditions making any mobility tortuous. Significant wind chill.
How Wet?
Rain rarely ceasing
Widespread rain, incessant and heavy on slopes near Llyn Peninsula/Cardigan Bay perhaps all day. Some improvement afternoon north and east of Snowdon. Beware fast-rising streams and flood risk.
Cloud on the hills?
Extensive, local improvements later
Blanket cloud from middle or lower slopes up through the morning, always lowest on western slopes. Breaks to middle slopes occurring afternoon, chance of breaks up to 700-800m Carneddau/east Wales.
Chance of cloud free summits?
Less than 10%, 20% east Wales later
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
9 or 10C, sharply dropping afternoon towards 5C. Feeling as cold as -10C in afternoon wind.
Freezing Level
Above the summits
Planning Outlook
Generally unsettled into the week with areas of low pressure moving in from the Atlantic on prevailing southwesterly winds. Temperatures relatively mild, higher tops in the Highlands intermittently just below freezing point; expect periods of thawing even up to these tops. Day-to-day weather detail will be uncertain even in short-range as complex systems develop - a series of frontal systems bringing spells of rain, at times more widespread and heavy - any snowfall mostly confined to highest tops in Scotland; also showers at times with hail mostly near western coasts. Wind speeds will also vary, often blustery with periods of gales or severe gales on tops, but local lulls too.