Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
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.
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
Wednesday 15th April 2026
Last updated
Tue 14th Apr 26 at
4:25PM
Summary for all mountain areas
Widespread gales, powerful gusts over tops and down northern slopes, severe at times in Scotland, particularly west. Persistent rain for many, brief dry windows east (notably Pennines), then heavy rain sweeps east afternoon, followed by showers, only easing late in the day. Mild air, but feeling cold in wind.
Headline for Eryri / Snowdonia National Park
Patchy rain/drizzle, heavier for a time; gusty gales
How windy? (On the summits)
South-southwesterly 40-55mph; powerful gusts, including to lower slopes towards Carneddau, risk 60mph at times. Southwesterly trend later, and perhaps briefly slightly lighter speeds for a few afternoon hours.
Effect of the wind on you?
Challenging conditions with significant wind chill in exposure likely all day; chaotic gusts constantly requiring effort to maintain balance. Forward progress becomes tortuous during periods of strongest wind.
How Wet?
Drizzle, patchy rain, then heavy rain afternoon, later showers
A persistent drizzle over the summits through morning, to the middle slopes early, with patchy rain occasionally drifting from the southwest too. Rain sets in persistent and heavy for several afternoon hours, breaking into heavy showers, these easing into evening.
Cloud on the hills?
Extensive, some improvement north and east but variable
Extensive to at least middle slopes at dawn, lower slopes or valley level facing Cardigan Bay/Llyn Peninsula. Bases lift, best Carneddau, to 600-800m, local breaks possible. Snowdonia/western slopes stay shrouded to at least 500m or lower, more widely extensive again for a few afternoon hours. Best higher breaks later, but always variable.
Chance of cloud free summits?
20%, 30% late in the day
Sunshine and air clarity?
Bursts of sunshine breaking out on lower slopes east, little or no sun west until late in the day. Largely poor visibility but locally very good where cloud base lifts, variable through the day.
How Cold? (at 900m)
6 or 7C morning into afternoon. Beginning to cool later afternoon, around 4C by evening. Feeling like -5 to -10C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 16th April 2026
Last updated
Tue 14th Apr 26 at
4:25PM
How windy? (On the summits)
Southwesterly 30-40mph at dawn, gradually easing to 20-25mph, stronger speeds over tops at times.
Effect of the wind on you?
Strenuous walking with a chilly feeling at dawn, an easing trend, may become fairly small but blustery in exposure.
How Wet?
Drizzle, some light showers
Drizzly over high terrain much of morning, to some middle western slopes. Drizzle will tend to ease, but scattered light showers will occur here and there through afternoon. A chance of some light rain into night.
Cloud on the hills?
Lifting to just high terrain
Most terrain above 700m in cloud from dawn, to 500m western slopes. Bases rising to mostly just caps on the high tops of Snowdonia NP around midday, with an increasing chance of summit breaks.
Chance of cloud free summits?
30% rising to 50%
Sunshine and air clarity?
Sunshine increasingly breaking out to a patchwork afternoon, slow to break in the west. Visibility becoming very good.
How Cold? (at 900m)
3 or 4C, may rise slightly. Feeling as cold as -8C in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 17th April 2026
Last updated
Tue 14th Apr 26 at
4:25PM
How windy? (On the summits)
Southerly 30-40mph, soon shifting southwesterly, some variability, reaching 45mph or higher over summits at times.
Effect of the wind on you?
Strenuous walking in exposure most of the day, at times deteriorating to arduous conditions with significant wind chill.
How Wet?
Heavy rain for a few hours, easing
Patchy rain through the morning, setting in persistent and heavy for a time (perhaps only a few hours). Breaking into scattered showers that will ease with time.
Cloud on the hills?
Variable, most west, more extensive for a time
From dawn, cloud shrouds high terrain, variable lower banks, mostly towards Cardigan Bay. Filling in more widely to middle slopes as rain sets in, then breaking again later as rain eases, though high summits struggle to clear. Bases always highest towards Carneddau.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Mostly cloudy, dull for several hours as rain sets in with poor visibility. Glimpses of sun later with good visibility.
How Cold? (at 900m)
5 or 6C. Feeling like -5 to -7C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
Unsettled conditions as the weekend approaches: showery on Thursday (local hail and lightning in Scotland), more rain and often heavy on Friday, accompanied by gusty winds, gales over mountains for periods; some bright spells on Thursday and later Friday too. Temperatures will tend to rise several degrees during daylight, even when cloudy, and often becoming warm in the valleys; slopes north of major hill groups often milder too. Saturday sees continued showers, mostly north and west where staying blustery, but a trend towards higher pressure building through late weekend into early next week. Confidence in detail for oncoming high pressure remains very low: a risk of chilly easterly wind for a time with showers, mostly east and southern areas.