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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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
Sunday 16th August 2026
Last updated
Sat 15th Aug 26 at
4:00PM
Summary for all mountain areas
Mostly light rain and drizzle will drift in from the west, some western hills often damp throughout the day and shrouded in cloud. Rain patchier northeastward across the Highlands, but a risk of local bursts of rain forming in the afternoon. Mid & south Wales largely dry. Generally light winds.
Headline for Eryri / Snowdonia National Park
Some dampness north, cloud lowers later.
How windy? (On the summits)
Northwest turning west-southwesterly, 10 to 15mph or at times less, rising a little through afternoon, 20mph into evening.
Effect of the wind on you?
Mostly small, feeling breezier later.
How Wet?
Occasional light rain mainly north
A few odd patches of light rain drift onto the hills mainly northwestern areas. More often dry toward mid Wales and most eastern hills.
Cloud on the hills?
Breaks to tops, but later lowering
Banks of cloud mostly western hills in morning, lifting and likely off many summits for extended periods. Patches drift over northern tops at times. Later in day, greater risk of cloud lowering widely, forming to mid-slopes in west.
Chance of cloud free summits?
60%, later in day dropping to 20%
Sunshine and air clarity?
Varied cloud and sun weakened by high cloud; often cloudier northwest. Very good visibility.
How Cold? (at 900m)
9 or 10C, only slight rise, mainly east.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 17th August 2026
Last updated
Sat 15th Aug 26 at
4:00PM
How windy? (On the summits)
Southwesterly 15 to 20mph in morning, tending to rise to 25mph afternoon, later in day 30-35mph, into night 40mph.
Effect of the wind on you?
Fairly small, but starting to affect ease of walking later in daytime on high terrain, more challenging from dusk.
How Wet?
Patchy drizzly rain west
A little light rain in the morning on western hills, may leave drizzly patches afternoon, but amounts small. Steadier then heavier rain develops onward into night from the north.
Cloud on the hills?
Most persistent western hills
Covering much high terrain in the morning, some banks of cloud from 500m up near coast in morning, higher bases inland. Varying into afternoon, some breaks, but often covering high terrain in west.
Chance of cloud free summits?
30% west, 50% east.
Sunshine and air clarity?
Sun fairly weak through high cloud, overcast for periods, cloudiest west. Visibility very good, but hazier near coast around light rain.
How Cold? (at 900m)
10 to 12C. As wind increases, later feeling like 5C, risk cooler by evening on tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 18th August 2026
Last updated
Sat 15th Aug 26 at
4:00PM
How windy? (On the summits)
Westerly 25 to 35mph, strongest sustained speeds and very gusty early in the day.
Effect of the wind on you?
Affecting walking and balance on higher terrain, for a time more challenging in exposure. Marked wind chill.
How Wet?
Rain then showers
Heavy rain from overnight through dawn may well soon clear southward, but a chance of some rain continuing on and off for a few hours, becoming scattered showers.
Cloud on the hills?
Early low cloud, may not clear west
Blanket cloud across hills from dawn, base tending to lift but likely to cap higher slopes much of day toward west; breaks east.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Cloud breaks to give sunny spells. Visibility improving to be very good.
How Cold? (at 900m)
9 or 10C, trending cooler later in day. Feeling near to freezing in the wind.
Freezing Level
Above the summits.
Planning Outlook
Low pressure initially to the north of Scotland early in the new week will eventually envelop the whole of Britain next week bringing generally unsettled and cooler conditions increasingly widely. Often blustery widely, west turning northerly winds later in week - becoming notably chilly over higher mountains. Rain extends into Scotland on Monday, turning heavy, then moves south over England and Wales by Monday night into early Tuesday. The rest of the week sees showery rain common for all areas, the rain most persistent in western Scotland, but heavier showery bursts and thundery downpours become widespread mid to late week.