Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
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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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.
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
Saturday 6th December 2025
Last updated
Fri 5th Dec 25 at
4:02PM
Summary for all mountain areas
Wind dropping light across much of the inland Highlands, but gusty near west coasts and staying strong for longer in the far north. Low cloud fairly widespread with patchy rain, clearer toward northwest. Southwesterly winds England, gale-force in Wales, driving in frequent heavy showery rain.
Headline for Eryri / Snowdonia National Park
Windy, strengthening gales on tops. Heavy showery rain on and off.
How windy? (On the summits)
Southwesterly 35 to 45mph, increasingly often reaching 50mph high tops middle of day into afternoon, squally gusts.
Effect of the wind on you?
Challenging walking conditions, frequent buffeting affecting balance on exposed tops and ridges; marked wind chill.
How Wet?
Frequent rain, heavy at times, chance hail and thunder
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, isolated thunder. Wet underfoot following previous rain, streams in spate, local flooding.
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
Fri 5th Dec 25 at
4:02PM
How windy? (On the summits)
Some uncertainty: South turning southwesterly, 30 to 40mph, risk becoming stronger, risk becoming 50mph+.
Effect of the wind on you?
Expect arduous conditions over higher terrain much of the day, at times difficult walking in exposure.
How Wet?
Rain likely, risk heavy
Risk of rain soon 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, near -5C if speeds increase.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 8th December 2025
Last updated
Fri 5th Dec 25 at
4:02PM
How windy? (On the summits)
Southwest turning later southerly, 30 to 45mph, speed likely to fluctuate; may strengthen further later or into night.
Effect of the wind on you?
Uncertain timing and intensity of conditions, be prepared for often arduous walking and marked wind chill.
How Wet?
Rain on and off, risk heavy later
Showery rain most common on western hills in the morning, some heavier, but tending to fade. Most likely after dark, threat of heavy rain sweeping in quickly lasting several hours.
Cloud on the hills?
Mostly higher western areas
Frequently capping higher slopes in Snowdon group and near to Cardigan Bay, bases varied 700-900m, may tend to lift with time; better breaks north/eastward.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Glimpses of sun mostly north and east areas; high cloud tending to build. Visibility good where dry, but reduced for periods in showers.
How Cold? (at 900m)
4 or 5C. If exposed to stronger winds, risk feeling like -8C on high tops.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled onward into next week with areas of low pressure moving in from the Atlantic on prevailing southwesterly winds. Temperatures often relatively mild, typically only 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 - any snowfall mostly confined to highest tops in Scotland; also showers at times with hail mostly near western coasts. Wind speeds will also vary, for periods reaching gale force on tops, but intermittent lulls.