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.
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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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.
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
Thursday 3rd September 2026
Last updated
Wed 2nd Sep 26 at
4:30PM
Summary for all mountain areas
Strong to gale-force winds over high terrain. A lot of cloud, shrouding all western hills, plus patchy rain and drizzle, becoming heavier persistent falls in the west later; a swathe of more intense rain develops for southwest Scotland into northwest England by evening, later into north Wales.
Headline for Eryri / Snowdonia National Park
Windy; cloudy with drizzly rain, heavy rain into night.
How windy? (On the summits)
Southwesterly 20-35mph, trending towards lower speeds for a time but then a swathe of strong wind arrives late, 50-60mph.
Effect of the wind on you?
Walking impeded in exposure, feeling chilly, effecting easing somewhat but significantly deteriorating into night.
How Wet?
Drizzle and light rain; then into night heavy rain sets in
Some drizzle on high tops early, this fading, but patchy light rain coming and going much of the day in west; some dry windows best in east. More frequent rain develops toward evening, sets in persistently heavy into night.
Cloud on the hills?
Fairly extensive, lowest west
Hills extensively shrouded to low slopes to start, a gradual lifting trend inland, mostly east Snowdonia/Carneddau areas but bases rare to 900m, and remaining more extensive on west slopes often to mid-slopes near coast. Will later fill in again more widely.
Chance of cloud free summits?
10% west coast, rising to 40% inland
Sunshine and air clarity?
A few bright glimpses mainly east & north but more often overcast. Locally good visibility where cloud lifts, more often poor on high tops and western hills.
How Cold? (at 900m)
12C, little change until later when approaching 14C for a few overnight hours; quite humid. Feeling like 3 to 5C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 4th September 2026
Last updated
Wed 2nd Sep 26 at
4:30PM
How windy? (On the summits)
West-southwesterly 35 to 50mph, stronger gusts around or before dawn over 60mph for a time.
Effect of the wind on you?
Arduous walking conditions, frequent buffeting knocking you off balance on exposed terrain. Considerable wind chill.
How Wet?
Dawn heavy rain clears to light showers
Overnight rain likely heavy for a time through toward dawn, leaving it very wet underfoot and fast-flowing streams. Early rain clears southwards to leave just residual patches of light rain over western hills, more often dry.
Cloud on the hills?
Often capping higher western tops
Cloud banks at varied heights from dawn, tending to lift and break early morning toward upper slopes, but patches then likely to come and go on tops all day, most often in west above 800m. Better breaks eastward.
Chance of cloud free summits?
Rising to 50%, or 70% east tops.
Sunshine and air clarity?
Fairly cloudy, occasional sun mostly east as high cloud tends to thin. Visibility good, some coastal haze.
How Cold? (at 900m)
7 or 8C, may be slightly milder at dawn. Directly in wind feeling like -3C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 5th September 2026
Last updated
Wed 2nd Sep 26 at
4:30PM
How windy? (On the summits)
Westerly 25-30mph at dawn, easing during morning to 15mph, turning SW'ly; tending to rise again, risk 40mph+ into night.
Effect of the wind on you?
Breezy and cool start, lessening to be soon small. Becoming blustery again later in day.
How Wet?
Possibly a little rain west
Odd drizzly showers over west coastal hills early in day, soon fading. During afternoon, chance of some rain extending in from southwest.
Cloud on the hills?
Mostly clearing
Patchy cloud over some slopes above 700m early morning in western areas, well broken inland. Tending to lift and break, some patches may return if rain occurs.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Glimpses of sun, best in east in morning; high cloud thickening to cover the sky. Visibility very good.
How Cold? (at 900m)
7C rising to 10C afternoon, little change or rising a degree or so higher evening/night. Feeling near 0C in wind early morning.
Freezing Level
Above the summits.
Planning Outlook
A series of weather systems moves in from the Atlantic over the next 10 days to bring spells of rain and showers, accompanied by frequently strong to gale force mountain winds. A window of better weather is likely on Saturday for Scotland and northern England, but further rain is expected to move in from the southwest by Saturday night and Sunday, heaviest western Scotland; a risk of more powerful upland gales developing over Scotland into Sunday. Temperatures will vary, mildest toward the south, but some cooler air moves in from the north at times bringing higher Scottish tops close to freezing point.