Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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 9th October 2025
Last updated
Wed 8th Oct 25 at
4:30PM
Summary for all mountain areas
Westerly gales across Scottish mountains, strongest toward the north, but widely very gusty. Windy also for northern England, lower speeds south across Wales. Low cloud covering most western hills, to lower elevations SW Scotland southwards, with some drizzle. Clearer with some sun in eastern Scotland.
Headline for Eryri / Snowdonia National Park
Gusty winds. Low cloud, a little drizzle west.
How windy? (On the summits)
Westerly 20 to 25mph, strongest sustained speeds higher tops in north, 30mph in places, gusty through passes and locally downslope.
Effect of the wind on you?
Blustery over the hills, gusts affecting balance in exposure over tops and ridges. Feeling cool.
How Wet?
Some drizzle
Drizzle most frequent slopes near coasts, particularly hills facing Anglesey. Fine drizzle in the air at times further inland, less toward east Wales.
Cloud on the hills?
Extensive, lowest west
Covering the hills most likely all day, above 500-600m western areas and near north coast, or to some lower slopes nearest coast. Base higher further inland, 700-800m, breaks toward tops toward Berwyn group.
Chance of cloud free summits?
10%, to 30% easternmost areas.
Sunshine and air clarity?
Rare moments of sun through the cloud. Hazy below cloud, visibility reduced to poor in drizzle.
How Cold? (at 900m)
7 or 8C, little change all day. Feeling near/below freezing in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 10th October 2025
Last updated
Wed 8th Oct 25 at
4:30PM
How windy? (On the summits)
West to northwesterly 15 to 20mph, locally lighter and variable mid-Wales.
Effect of the wind on you?
Mostly small, some more noticeable gusts around some higher ridges.
How Wet?
Largely dry
Rare pockets of fine drizzle in the morning, mostly toward coast.
Cloud on the hills?
Fairly extensive, breaks forming
Varied low cloud and fog from dawn, becoming confined higher up during the morning, for a time some slopes possibly between or above fog layers. Tending to gradually thin, some breaks to tops.
Chance of cloud free summits?
20% rising to 60% afternoon
Sunshine and air clarity?
Glimpses of sun developing, becoming sunnier afternoon. Hazy or misty start, improving visibility with time.
How Cold? (at 900m)
8 or 9C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 11th October 2025
Last updated
Wed 8th Oct 25 at
4:30PM
How windy? (On the summits)
Variable 10mph or less.
Effect of the wind on you?
Small
How Wet?
No rain expected
Cloud on the hills?
Fog or low cloud banks, tops likely clear
Varied fog from dawn, mostly low to mid-terrain, higher tops likely above an inversion. Patchy cloud banks drift higher up during morning into middle of day, but high summits may well remain clear.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Mix of cloud and sun; highest summits may be sunny all day in very clear air. Some haze or mist lower down.
How Cold? (at 900m)
7 to 9C; little change with height in morning, some lower slopes start cooler.
Freezing Level
Above the summits
Planning Outlook
High pressure becomes established over the British Isles into the weekend, bringing quiet, dry weather conditions which continue into next week. Westerly winds prevail in northern Scotland into Saturday, then light winds across the Highlands for several days onward. Easterly winds are expected to increase with time next week for England and Wales. Scope for inversion conditions this weekend and early next week with some valley fog and varied low cloud. Pleasant daytime temperatures, some cooler nights with slight frost where skies are clear.