Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
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.
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
Saturday 19th September 2026
Last updated
Fri 18th Sep 26 at
4:00PM
Summary for all mountain areas
Challenging conditions over high terrain with gale-force winds extensive; feeling notably cold in exposure. Showery rain, most frequent western Scotland. Persistent rain for Wales tends to clear southward and the strongest winds will lessen here.
Headline for Eryri / Snowdonia National Park
Windy, gales for a time, lessening; patchy rain, light showers.
How windy? (On the summits)
Southwesterly 35 to 45mph, strongest in the morning, easing during day to 25-30mph afternoon.
Effect of the wind on you?
Strenuous-to-arduous walking conditions in the morning, frequent buffeting on high exposed terrain with considerable wind chill. Moderating, but still feeling blustery in exposure in afternoon.
How Wet?
Light rain mostly west in morning
Mostly light showery rain and drizzle, some steadier rain on western hills particularly mid-Wales for a few hours early morning. Tending to fade to leave just patchy brief and light showers into afternoon.
Cloud on the hills?
Lifting toward or above tops
Fairly extensive cloud over higher slopes early in day, bases typically 600 to 800m, lowest in west, tending to rise with time, some higher breaks to 900m and above, more often toward Carneddau, Bala and Berwyn.
Chance of cloud free summits?
30% rising to 60%
Sunshine and air clarity?
Glimpses of sun, more common east Wales and more often afternoon. Slight haze especially toward coasts, reduced in rain, better east, becoming good.
How Cold? (at 900m)
7 to 9C, trending slightly cooler later in the daytime. Feeling like -2 to -5C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 20th September 2026
Last updated
Fri 18th Sep 26 at
4:00PM
How windy? (On the summits)
Westerly 25-35mph early morning, tending to ease to 20mph.
Effect of the wind on you?
Blustery and chilly early in the day, affecting comfortable walking and balance on exposed tops, moderating.
How Wet?
Little or no rain
Local drizzly showers possible over coastal hills early in day, but mostly dry. Toward evening, drizzly rain may return from the west.
Cloud on the hills?
Lifting and clearing, lowers later
Patchy cloud above 700-800m in morning, most common near west coast. Lifting and clearing, but patches may come and go on higher western tops. If drizzle develops, cloud lowering back onto hills later.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Broken cloud and sunshine; high cloud tends to thicken to cover the sky. Some haze especially morning and evening, visibility very good for a time.
How Cold? (at 900m)
6 or 7C, little change all day, then tending to rise onward into night. Feeling sub-zero in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 21st September 2026
Last updated
Fri 18th Sep 26 at
4:00PM
How windy? (On the summits)
Westerly 25-30mph early in day, very gusty in places, but speeds tending to lessen during day to 15mph or less.
Effect of the wind on you?
Breezy, affecting ease of walking and balance on exposed tops for a time, but likely becoming smaller.
How Wet?
A little drizzle
Fine drizzle where in cloud feeling persistently damp, particularly western hills; drier toward the east.
Cloud on the hills?
Lowest west, high tops may be clear
Blanket cloud shrouding many western hills all day, to some lower slopes near Cardigan Bay. Highest tops may be near the top of the cloud sheet. Possibly more substantial breaks Carneddau and toward east.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Some sun mostly develops in east and northernmost areas, in places may emerge into sunshine and clear air if above cloud, but staying misty poor visibility lower down.
How Cold? (at 900m)
12 to 14C, little change into night; quite humid.
Freezing Level
Above the summits.
Planning Outlook
Improving on Sunday as gale-force winds on Scottish mountains gradually lessen and showers become fewer. Warm and humid into early next week, on Monday extensive low cloud and drizzly rain particularly in the west. High pressure to the south will generally dominate the extended outlook particularly for England & Wales with more often drier and warmer conditions through late September into early October. Fine weather likely extends across Scotland for periods too, but a more changeable autumnal mix may continue especially further northwest with rain and stronger winds at times.