Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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
Thursday 20th August 2026
Last updated
Wed 19th Aug 26 at
4:30PM
Summary for all mountain areas
Showers and low cloud push into north Scotland all day, feeling chilly in the wind. Showers more scattered over southern Munros. Showers affect south Scotland, England, and Wales all day, with a notable cluster of frequent heavy rain drifting south through England into the Peak District around midday, showers follow behind.
Headline for Eryri / Snowdonia National Park
Frequent showers, only later easing
How windy? (On the summits)
Westerly turning northerly, speed likely varying 10-20mph through morning, strengthening through afternoon to 20-25mph.
Effect of the wind on you?
Fairly small through morning, starting to become breezy in exposure through afternoon with a chill arriving.
How Wet?
Frequent rain, some heavy
Rain on and off much of the day, heavy bursts and local thundery downpours here and there in the morning, at times clustering into more persistent spells of rain. Tending to break into scattered showers late in the day.
Cloud on the hills?
Fairly extensive
Often covering many hills above 600 to 800m, lowest in north and during rain, some ragged patches will form to lower slopes. Some higher breaks may form inland, but then a period of more extensive cloud returns for several afternoon hours.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Mostly cloudy, rare sun breaking through, best to the south and east. Visibility often poor on the high summits, but locally very good where out of cloud and rain.
How Cold? (at 900m)
7 to 9C. Feeling close to freezing in stronger wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 21st August 2026
Last updated
Wed 19th Aug 26 at
4:30PM
How windy? (On the summits)
Northerly but variable, around 10mph. Local gusts forming around afternoon showers.
Effect of the wind on you?
Negligible.
How Wet?
Often raining
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 inland, but some showers breaking out here as well.
Cloud on the hills?
Extensive over tops
A layer of cloud shrouds terrain above 500-700m in the morning, lowest bases to the north where regularly approaching lower slopes in heavier rain. A lifting trend, some breaks to higher terrain to the south and east, but highest summits struggle to clear.
Chance of cloud free summits?
30%
Sunshine and air clarity?
A few bright glimpses to the south and east. Visibility often poor on high terrain.
How Cold? (at 900m)
7 or 8C, may rise slightly around Penygader.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 22nd August 2026
Last updated
Wed 19th Aug 26 at
4:30PM
How windy? (On the summits)
Northerly 10-15mph, some 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.
Planning Outlook
As the weekend approaches, wind shifts northerly, moving showers southward. Generally lighter wind but gusts will be common around showers. Temperature lowers too, dropping close to freezing on high Scottish tops on Friday morning (chance of sleet/snow here) and frost may occur in Highland glens over a couple of nights. Heavy showers in England and Wales on Friday, then more often dry with few lighter showers through the weekend as higher pressure builds into the southwest. Conditions remain on the drier, brighter side into early next week. Wind shifts southwesterly and pressure drops again as the week goes, bringing periods of cloud and rain for most hill groups, and perhaps some stronger wind at times. Detail is uncertain, but some windows of better weather are possible, notably in north and eastern areas.