Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 26th April 2026
Last updated
Sat 25th Apr 26 at
3:56PM
Summary for all mountain areas
Showers in Scotland spread east, turning heavy afternoon. Fog lowering to high terrain in the west Highlands, becoming cooler here. Patchy dawn mist England and Wales, a broader low layer of sea fog east of the Pennines, lifting for clear hills; risk of a few late showers in north England. A cool start, becoming mild.
Headline for Eryri / Snowdonia National Park
Mild, mixed cloud and sun; scattered afternoon showers
How windy? (On the summits)
South-southwesterly 10-15mph, up to 20mph early in the day. Trending variable in direction and towards lower speeds.
Effect of the wind on you?
Mostly small, through a notable breeze in the morning, some gustiness too (not just on high terrain).
How Wet?
Spotty afternoon showers
A few light showers drift over the hills from Cardigan Bay, the hills more often dry, and many hills entirely dry all day.
Cloud on the hills?
Likely cloud-free
Patchy mist in east-Wales valleys, this soon dissipating after sunrise for cloud-free hills. Snowdonia may be cloud-free dawn to dusk.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Often sunny, though weakened by high cloud, which may thicken at times. Very good visibility, some haze.
How Cold? (at 900m)
9 or 10C. Starting several degrees cooler in the valleys, rising to 17C, or locally warmer east Wales.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 27th April 2026
Last updated
Sat 25th Apr 26 at
3:56PM
How windy? (On the summits)
Northerly 10-15mph; may shift northeasterly afternoon, notable gusts to 20mph.
Effect of the wind on you?
Fairly small, though some inconvenient gusts over high terrain at times.
How Wet?
Chance scattered showers, mostly dry
Scattered showers here and there, greatest risk on northern slopes and eastern areas, but many hills stay entirely dry.
Cloud on the hills?
Banks lingering on high northern slopes
Banks of cloud at various elevations from dawn, lifting to mostly 800-900m and up through morning and becoming well-broken towards mid-Wales. Northern slopes and high tops of Snowdonia more often capped.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Often sunny mid-Wales, more often cloudy north Snowdonia, then a patchwork of sun afternoon. Very good visibility, though an early haze.
How Cold? (at 900m)
7 or 8C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 28th April 2026
Last updated
Sat 25th Apr 26 at
3:56PM
How windy? (On the summits)
Northeasterly 10-20mph. Notable gusts, not just on high exposed terrain.
Effect of the wind on you?
Fairly small, but the strongest gusts may briefly impede walking.
How Wet?
Scattered showers
Occasional showers, mostly light, and largely in east Wales. A few showers may drift further west.
Cloud on the hills?
Passing caps over summits
A layer of cloud above 600m early, most extensive eastern hills, this lifting through morning to just high terrain. Breaks off high summits are probable, but banks will return to highest summits at times too.
Chance of cloud free summits?
Rising to 80%
Sunshine and air clarity?
A patchwork of cloud and sun, best chance of extended sun breaks west. Excellent visibility.
How Cold? (at 900m)
4 to 7C.
Freezing Level
Above the summits.
Planning Outlook
Monday is likely showery, risk heavy with lightning in England. An easterly wind then gradually establishes in England and Wales, chilly nights and mornings with patchy dawn mist and light frosts, this soon fading for warm days. High pressure remains dominant through the week: regularly sunny and pleasantly warm days; summit temperatures often at or above 10C, many valleys will warm toward 20C or higher afternoon. Risk of sunburn in strong sunshine and very dry springtime ground conditions with high risk of wildfire. Detail becomes uncertain into next weekend, but a rising risk of showers and longer spells of rain, mostly England and Wales, and likely turning cooler into the following week as wind shifts northerly.