Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
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.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
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
Monday 13th October 2025
Last updated
Sun 12th Oct 25 at
4:00PM
Summary for all mountain areas
Inversion conditions widely across Scottish highlands. High tops of Lakeland and Snowdonia also likely above a cloud layer. Feeling quite warm in the autumn sunshine on summits above the cloud; valleys and glens starting cooler. Cloudier over Pennines and east Wales, most fog rising to high terrain with local breaks.
Headline for Eryri / Snowdonia National Park
High summits above cloud layer; warm in sunshine
How windy? (On the summits)
Southeasterly 10-15mph, occasional 20mph. Notable gusts over summits and elevated passes.
Effect of the wind on you?
Mostly small.
How Wet?
No rain expected
Cloud on the hills?
Mid-level cloud, mostly eastern slopes
Low fog from dawn most extensive over Berwyn group and eastern parts of Snowdonia NP, some banks on middle slopes. Cloud lifts with patches between 500-800m, more sheet-like in the east in the morning. Terrain above 800m likely above cloud layer, though some patchy cloud may drift higher later in the day.
Chance of cloud free summits?
70% (high summits above cloud)
Sunshine and air clarity?
Sunny on high tops, more mixed lower terrain, possibly quite cloudy east. Excellent visibility above cloud, hazy lower down.
How Cold? (at 900m)
11C; little change with height in the morning though valleys starting much cooler. Highest terrain above cloud may warm a degree or two.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 14th October 2025
Last updated
Sun 12th Oct 25 at
4:00PM
How windy? (On the summits)
Easterly 10 to 15mph, in places gusty 20mph around some mountains, not necessarily on the summits.
Effect of the wind on you?
Mostly small
How Wet?
No rain expected
Cloud on the hills?
Patchy cloud, inversion; clearer west
Varied valley fog and cloud banks on some slopes in morning, high tops likely start above the cloud layer. Cloud tending to drift higher up, and may cover higher slopes at times. Clearer overall in west.
Chance of cloud free summits?
60% (above cloud banks for a time)
Sunshine and air clarity?
Sunshine generally best in west Wales. The air very clear if above the cloud. Some mist lower down in morning.
How Cold? (at 900m)
9C, small variation from lower slopes upward in morning, whilst highest tops a degree or so warmer all day.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 15th October 2025
Last updated
Sun 12th Oct 25 at
4:00PM
How windy? (On the summits)
Generally northeasterly though variable, 10-15mph. May reach near 20mph mid-Wales. Gusts likely.
Effect of the wind on you?
Fairly small
How Wet?
No rain expected
Cloud on the hills?
Cloud lifts to high ground, well-broken
From dawn, well broken cloud at various heights, perhaps more extensive across Berwyn group - Snowdon likely above the cloud layer. Bases lift to the high tops, which will be regularly exposed as cloud continues to break.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Increasingly sunny as cloud increasingly breaks. Very clear air on the high tops, a haze lower down.
How Cold? (at 900m)
7 or 8C. Cooler in the valleys at dawn.
Freezing Level
Above the summits
Planning Outlook
High pressure resides over the country through the week, maintaining quiet weather. In the mornings, varied low cloud and morning fog is likely while inversion conditions likely to remain over highest mountains for several days. A haze will linger on low slopes below the inversion. During midweek the inversion starts to weaken as pressure begins to fall gradually; cloud will be well-broken for many and begin to lift to higher terrain. Light winds overall, an easterly breeze likely for Wales. Uncertainty about the weather pattern development toward next weekend: some indication of strengthening winds bringing some rain, but may not reach all areas. Later October has hints of chillier northerly air, especially in Scotland.