Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Hazy, some fog banks
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Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Hazy, some fog banks
Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
Chilly
Air temperature typically 0 to 5C 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
Friday 5th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
Summary for all mountain areas
South-southeasterly winds strengthen, reaching gale-force afternoon many areas, sooner Wales, here becoming severe. Some rain / hill snow NE Scotland fades, patchy rain west coasts, otherwise dry, then rain sweeps in from southwest later, snow inland mountains into evening. Best cloud breaks NW Scotland.
Headline for Eryri / Snowdonia National Park
Gales strengthen to become severe. Rain develops, heavy later.
How windy? (On the summits)
Southerly 30-35mph soon from dawn, rising to southeasterly 50mph middle of day, reaching 60mph afternoon with stronger gusts high tops. Turning southwesterly after dark, easing a little but still near 40mph.
Effect of the wind on you?
Strenuous walking early deteriorates to widely challenging conditions with powerful gusts, by afternoon enough to knock you over. Significant wind chill.
How Wet?
Rain sets in widely from midday
Patchy showery rain drifts inland from Cardigan Bay early, sleet on high tops. Rain sets in widely around the midday hours with heavy falls developing afternoon and onward into evening. Frequent showery rain into night. Streams again rising to be in spate later.
Cloud on the hills?
Becoming extensive, better north
From dawn cloud likely caps the high tops with banks down towards 700m on western slopes. Soon lowering widely towards 600-700m as rain arrives, as low as 400m westernmost slopes. Clearer for longer north/eastern hills.
Chance of cloud free summits?
30%, to 60% north, later 10% in rain.
Sunshine and air clarity?
Overcast, high cloud lowering during morning to become increasingly dull. Visibility becomes poor as rain sets in.
How Cold? (at 900m)
1 or 2C, rapidly rising afternoon to 4 or 5C, remaining warmer into night. Rising temperature offset by wind chill, feeling like -12C in exposure.
Freezing Level
700-800m, rising above the summits through morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 6th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
How windy? (On the summits)
Southwesterly 35 to 45mph, risk strengthening over 50mph high tops.
Effect of the wind on you?
Challenging walking conditions, frequent buffeting affecting balance on exposed tops and ridges; marked wind chill.
How Wet?
Frequent showery rain
Rain on and off most or all day, a mix of drizzle where in cloud and some steadier rain, but heavier showery bursts at times, particularly western hills, possible hail.
Cloud on the hills?
Fairly extensive tops
Often covering higher slopes, bases varied in and out of rain, mostly 600 to 800m. More frequent to mid-slopes near Cardigan Bay for periods. Higher breaks more common Bala to Berwyn hills.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun mostly east. Visibility varied, poor in rain, intermittently good out of cloud.
How Cold? (at 900m)
4C. Wind chill feeling like -7 to -10C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 7th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
How windy? (On the summits)
Very uncertain speeds: South turning southwesterly, 25 to 40mph, risk often stronger, chance becoming 50mph+
Effect of the wind on you?
Expect blustery conditions, beware potential for arduous conditions all day, possibly widely more difficult.
How Wet?
Rain likely, risk heavy
Risk of rain fairly persistent western hills, setting in for steady or heavy rain for a few hours at least.
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.
Chance of cloud free summits?
20%
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. Feeling below freezing in the wind.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through the weekend and into next week with areas of low pressure circulating near to the British Isles. Day-to-day detail will be uncertain even in short-range as complex systems move around slowly - a series of frontal systems bringing spells of rain and some high-level snow, mixed with showers with hail mostly near western coasts. Temperatures often on the milder side compared to recently, with typically only higher tops in the Highlands intermittently just below freezing point, expect periods of thawing up to these tops. Wind speeds will also vary, often south to southwesterlies, at times reaching gale force on tops, but intermittent lulls.