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.
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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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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.
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
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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 29th October 2026
Last updated
Wed 28th Oct 26 at
12:04PM
Summary for all mountain areas
Windy Scottish, particularly NW Highlands. Across upland Britain, low cloud will give extensive fog, breaking in some areas (notable N Scotland and Wales) through the day, but holding on in others. Mild.
Headline for Eryri / Snowdonia National Park
Intermittent sunshine; fairly light wind.
How windy? (On the summits)
Southerly 15 or 20mph, possibly 25mph intermittently higher western summits.
Effect of the wind on you?
Small.
How Wet?
Risk fine drizzle in cloud.
Largely or completely dry, but perhaps pockets fine drizzle where in fog.
Cloud on the hills?
Extensive, in places from valleys up.
Morning: Extensive fog, from some valleys up, and widely above 300m - although some higher areas may be or become cloud free, particularly Snowdon area. Afternoon: Most summits probably clearing at least temporarily. The fog most likely to persist (although cloud base should rise) east Wales.
Chance of cloud free summits?
20% rising to 60%
Sunshine and air clarity?
Morning: areas where dull and misty or foggy, but the sun may well come through widely west Wales. Afternoon: Some sun most areas, but remaining hazy. Cloudiest E Wales.
How Cold? (at 900m)
6C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 30th October 2026
Last updated
Wed 28th Oct 26 at
12:04PM
How windy? (On the summits)
Southerly 25 to perhaps 30mph higher western summits in morning. Will tend to ease to 15mph during day.
Effect of the wind on you?
Becoming small.
How Wet?
Rain unlikely
Extensively or completely dry, although risk of a few patches of fine drizzle where foggy in places in morning.
Cloud on the hills?
May be extensive morning east Wales
Generally cloud base rising to 750m or above - perhaps increasingly clearing higher summits at times. But threat particularly morning east Wales, of much lower cloud, possibly initially from just above valleys up.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Patches of sunshine particularly west Wales. Hazy, patches of fog east Wales morning.
How Cold? (at 900m)
8C
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 31st October 2026
Last updated
Wed 28th Oct 26 at
12:04PM
How windy? (On the summits)
Southerly 10mph or less.
Effect of the wind on you?
Negligible
How Wet?
Risk pockets of fine drizzle
In cloud, mainly easternmost slopes in Wales, fine drizzle in places.
Cloud on the hills?
Patches of fog, may largely clear.
Fog likely to shroud some upland areas, particularly morning, perhaps very extensive and persistent easternmost Wales. The top of the cloud may be around 750m, possibly lower (as yet uncertain).
Chance of cloud free summits?
70% (sometimes fog below summits)
Sunshine and air clarity?
Hazy sunshine breaking through, perhaps widely sunny with superb visibility higher slopes. Lower down, very hazy and particularly morning misty or foggy.
How Cold? (at 900m)
8C.
Freezing Level
Above the summits.
Planning Outlook
High pressure will bring many days of fine weather and frequently little wind next week. Beforehand there is one 'troublesome' front to contend with: On Friday and the weekend its zone of low cloud and patches of drizzly rain drifts into NW Scotland and then slowly southeastwards (but will stop and temporarily edge back again), before clearing to often clear skies and frosty nights (in valleys). Until it clears, even away from the front, fog will be extensive, albeit some mountains will protrude above the fog into daytime bright sunshine.