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.
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.
Hazy, some fog banks
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Hazy views with lack of air clarity, particularly on lower terrain, some fog banks on hills making navigation locally more difficult. If above an inversion, the air outstandingly clear.
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.
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.
Hazy, some fog banks
Hazy views with lack of air clarity, particularly on lower terrain, some fog banks on hills making navigation locally more difficult. If above an inversion, the air outstandingly clear.
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 17th October 2025
Last updated
Thu 16th Oct 25 at
4:25PM
Summary for all mountain areas
Varied areas of low cloud / fog in morning, some highest tops just poking above an inversion, mainly southwest-central Highlands, possibly Snowdon group and Lakeland high tops. Cloud tending to rise, some breaks locally. A thicker cloud layer north-east Highlands, local drizzle. SE'ly breeze starting to increase.
Headline for Eryri / Snowdonia National Park
Patchy low cloud / early fog banks, some sun. Light wind til late.
How windy? (On the summits)
South to southeasterly, though variable early in day, around 10mph. Rising towards 15mph toward dusk, 20-25mph into night, local stronger gusts developing.
Effect of the wind on you?
Mostly small; feeling breezier later in day.
How Wet?
No rain expected
Cloud on the hills?
Varied low cloud and fog, rising to high terrain, some breaks
Banks of cloud on some mid and upper slopes from dawn, some local valley mist possible. Local clearer areas. Highest summits may start near or just above the cloud, but this lifts onto high terrain, then breaking occasionally for clear hills afternoon.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Intermittent sunshine, possibly above early fog; some wispy cloud high in sky. Good visibility though some haze especially morning.
How Cold? (at 900m)
6C, feeling nearer freezing where breeze increases.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 18th October 2025
Last updated
Thu 16th Oct 25 at
4:25PM
How windy? (On the summits)
Southeasterly, tending to increase 25 to 40mph, very gusty in places, especially later.
Effect of the wind on you?
Blustery, challenging conditions in places higher mountains, affecting comfortable walking and balance on ridges.
How Wet?
Rain unlikely until late
Some patchy rain may encroach from west later in day, then more persistent into the night.
Cloud on the hills?
Good breaks north
Patchy cloud on some slopes in morning, highest tops may start near or just above these patches. Cloud lifting to the tops locally for a time, but breaking from most hills, clearest most often in north Eryri.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Glimpses of sun, best in north. An increasing veil of high cloud. Visibility good, but some haze.
How Cold? (at 900m)
6C, but feeling nearer -5C in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 19th October 2025
Last updated
Thu 16th Oct 25 at
4:25PM
How windy? (On the summits)
South to southeasterly, 35 to 50mph, speed may vary during day, gusty for periods around high tops.
Effect of the wind on you?
Expect challenging conditions over the mountains, frequent buffeting gusts affecting balance. Marked wind chill.
How Wet?
Persistent rain, heavy for a time
Risk of rain much of the day, in the morning may be patchier and lighter, less toward the north coast. Several hours of heavier rain setting in from the southwest. May ease from west later.
Cloud on the hills?
Extensive, higher north
Shrouding higher mountains likely all day, forming to mid-slopes many western areas, highest breaks north of the A5.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Sun unlikely, overcast, murky in rain. Local better visibility toward north for a time.
How Cold? (at 900m)
8C, small change with height on hills. Feeling near -5C directly in the wind.
Freezing Level
Above the summits
Planning Outlook
Southeasterly winds increase into the weekend, becoming gale force on many hills into Sunday. A dry day on Saturday with variable cloud - some highest tops may start near or above the cloud mainly in Scotland, but the inversion largely gone by this time as cloud rises higher - best breaks during the day toward the northwest of major hill groups. Fronts moving in from the Atlantic by Sunday bring rain, which is likely to become heavy, especially Wales, then northern England, but uncertainty how fast this spreads into Scotland. A more unsettled outlook into next week with areas of rain and showers, which will vary locally day-to-day. Likely colder later in the week, may drop to freezing on highest mountains.