Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Friday 21st August 2026
Last updated
Thu 20th Aug 26 at
4:00PM
Summary for all mountain areas
Early showers in north Scotland, then a dry afternoon, though cloud lingers on northern tops. Largely dry start for south Scotland and England, mostly clear hills, then afternoon showers forming, particularly over the Pennines. Showers on and off in Wales, some heavy bursts. Cool-to-mild and little wind.
Headline for Eryri / Snowdonia National Park
Rain on-and-off, variable cloud; light wind
How windy? (On the summits)
Northerly but variable, around 10mph. Local gusts forming around afternoon showers. Strengthening towards 15-20mph into evening.
Effect of the wind on you?
Negligible most of the day, a breeze beginning to pick up later.
How Wet?
Rain on and off
Areas of rain drift into the hills from the sea much of the day, northern hills most often affected where persistent falls will come and go. Drier windows occur from time to time, but always with a risk of rain returning.
Cloud on the hills?
Extensive over tops, may break later
A layer of cloud shrouds terrain above 700m in the morning, lowest bases to the north where approaching lower slopes in heavier rain. Variable for several hours, some breaks forming towards high terrain, but returning to middle slopes in rain. Some chance of more extensive breaks later in the day.
Chance of cloud free summits?
20%, later rising to 50%
Sunshine and air clarity?
A few bright glimpses to the south and east, and perhaps more extensive sunny breaks later in the day. Varied visibility, often poor on high terrain but very good when cloud lifts.
How Cold? (at 900m)
7 or 8C, rising slightly higher around Penygader.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 22nd August 2026
Last updated
Thu 20th Aug 26 at
4:00PM
How windy? (On the summits)
Northerly 10-15mph, gusts beginning to form on high terrain.
Effect of the wind on you?
Mostly small, some nuisance gusts over high tops.
How Wet?
Early rain fades
An area of rain lingers over many hills in the morning, generally light in nature, and tending to break and drift to the south and east for increasingly dry mountains.
Cloud on the hills?
Lifting to summits with breaks
Fairly extensive over high terrain in the morning with lower patches, to lower northern slopes where sheltered. Cloud lifts to summit height, many summits clearing afternoon; highest summits to the north and Snowdon may be more often capped.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Patchwork of cloud and sun. Excellent visibility.
How Cold? (at 900m)
7 to 9C, mildest to the south and east.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 23rd August 2026
Last updated
Thu 20th Aug 26 at
4:00PM
How windy? (On the summits)
Variable mostly less than 10mph, some upslope breezes forming.
Effect of the wind on you?
Negligible.
How Wet?
Little or none
A little fine drizzle in cloud on upper northern slopes, but otherwise dry.
Cloud on the hills?
Rising to high summits
Banks at varied heights in the morning, including into valleys; clear windows between cloud layers (possibly clear summits). Cloud will lift towards summit height, many hills entirely clearing, but highest summits may struggle to see breaks.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Patchwork of cloud and sun. Very good visibility.
How Cold? (at 900m)
7C rising to 10 or 11C, mildest towards Penygader.
Freezing Level
Above the summits.
Planning Outlook
The weekend is often cloudy in north and west Scotland, some drizzle on the summits with occasional light rain, amounting to little. Drier south and east Scotland, but cloud will reach here too, particularly on Sunday. England and Wales will be largely dry and bright this weekend with little wind and mild temperatures. On Sunday, high pressure west of the country may facilitate local inversion conditions, but low cloud likely quick to fade. Next week begins dry and bright, but wind shifts southeasterly and pressure drops again as the week goes, bringing periods of cloud and rain (sometimes heavy) to most hill groups, some stronger wind at times. Similar conditions persist into the following weekend: generally unsettled but a chance of a settled window, best in the east.