Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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
Friday 25th September 2026
Last updated
Thu 24th Sep 26 at
4:28PM
Summary for all mountain areas
Windy in Scotland, showers west, only scattered eastward where often sunny; wind lessens for a time afternoon. Patchy rain England and Wales, tending to break up in north England later. Rain and cloud linger in Wales and south Pennines but rainfall totals small; mild-to-warm, little wind in Wales.
Headline for Eryri / Snowdonia National Park
Spotty rain much of the day, hill cloud generally rises
How windy? (On the summits)
Westerly or variable 10-15mph or less, but at dawn 20-25mph and rising a little again toward evening.
Effect of the wind on you?
Mostly small.
How Wet?
Rain mostly west, tending to break up and ultimately fade
Drizzly rain from before dawn in west, turning to more frequent rain for several morning hours, though any heavier falls largely isolated to high tops and western slopes. Rain will tend to ease and break up, though a few patches come and go well into the day.
Cloud on the hills?
Extensive early, increasingly breaking up
Hills shrouded widely above 700m to start, lower where in rain, with banks to 400m or lower western slopes in rain. As morning goes, bases lift somewhat, then will begin to break up, to just banks over high terrain afternoon, some breaks to or above summits but patches returning too.
Chance of cloud free summits?
20%, rising to 50%
Sunshine and air clarity?
Largely cloudy, some brighter breaks afternoon but any sun weakened by high cloud. Fairly poor visibility to start in cloud and rain, tending to improve, staying varied on high terrain.
How Cold? (at 900m)
Around 10C to start, soon cooling slightly to around 8 or 9C for the rest of the day.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 26th September 2026
Last updated
Thu 24th Sep 26 at
4:28PM
How windy? (On the summits)
Southwesterly 20 to 30mph, sustained speeds tending to rise during afternoon, may gust 40mph high west tops.
Effect of the wind on you?
Increasingly blustery, affecting comfortable walking particularly afternoon on high terrain, feeling cool in exposure on tops.
How Wet?
A little rain in west
Some light showery rain occasionally mainly toward west coast, odd light showers elsewhere, but more often dry inland and eastern areas.
Cloud on the hills?
Capping some tops
Patchy cloud drifts over some higher slopes above 700-800m toward the west coast in the morning, tending to lift higher, breaking above tops to the north and east with time. Slopes facing Cardigan Bay will often have banks clinging to higher elevations.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Glimpses of sun west, more frequent north and eastern areas, notably low slopes. Hazy toward west coast, but visibility very good further north and east.
How Cold? (at 900m)
7C rising to 9C. Feeling near to 0C in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 27th September 2026
Last updated
Thu 24th Sep 26 at
4:28PM
How windy? (On the summits)
A gusty southerly 30-40mph, sometimes 45mph over high tops, later shifting westerly and lessening, 25-30mph.
Effect of the wind on you?
Strenuous walking, buffeting beginning to deflect accurate foot placement; considerable wind chill.
How Wet?
Afternoon rain, heavy for a time
Mostly dry early, some light rain beginning to approach from the south and west. Rain becomes frequent, setting in for several hours, a swathe of heavy rain likely, briefly torrential west slopes. Breaking up somewhat later.
Cloud on the hills?
Clear early hours, then covering high terrain
Little or no cloud for several morning hours. Patches starting to lower onto tops, suddenly filling in over high terrain afternoon, and lowering towards 500m locally during heaviest rain.
Chance of cloud free summits?
80% lowering to 20%
Sunshine and air clarity?
Sunny start, patchy cloud building, overcast for much of the afternoon. Very good visibility, deteriorating with cloud/rain.
How Cold? (at 900m)
9 or 10C, rising a degree afternoon, then notably cooling into night. Feeling like 0C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
South to southwesterly winds prevail onward into the weekend and next week. Saturday will be bright for many, windy in Scotland with some showers in the west. Mild-to-warm temperatures, but a chilly feeling north in wind. A band of rain sweeps eastward more broadly on Sunday; rain could be very heavy for a few afternoon hours. A window of higher pressure is indicated for Monday with warmer, brighter conditions for many, but northwest Scotland starts breezy with cloud and some light rain. Into mid-next week, risk of a more widespread gale, or severe gale over higher mountains. Detail of timing is uncertain, but several bands of rain punctuated by showers and bright spells will likely cross most mountain areas. Unseasonably warm temperatures. The weather stays mixed into early October.