Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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.
Click an icon for more information or click here for a key to all icons.
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Wednesday 30th September 2026
Last updated
Tue 29th Sep 26 at
4:15PM
Summary for all mountain areas
Heavy rain sweeps northeast across England and Scotland through morning: persistent falls, locally torrential with risk thunder, particularly west Scotland early hours. Rain soon clears Wales, more widely by midday, bright skies follow, trending cooler and showers developing. Widely windy, gales in Scotland.
Headline for Eryri / Snowdonia National Park
Windy; heavy rain at dawn, then sun and increasing showers
How windy? (On the summits)
Southerly 30 to 40mph, at times gusting up to 50mph over higher mountains particularly toward the west; generally lessening late in the day.
Effect of the wind on you?
Strenuous walking conditions, more challenging in places on exposed high terrain with frequent buffeting and notable wind chill.
How Wet?
Frequent bursts of rain west
A band of heavy rain from dawn soon clears northeastward, a brief drier window, just a little drizzle on high tops, then clusters of heavy showers follow, merging to frequent rain west coastal areas, risk of isolated thunder.
Cloud on the hills?
Often capping tops, breaks north/east
Cloud base lifting early morning with breaks to upper slopes, and may well break off summits for a time. Caps return to high tops and upper west coastal slopes, varying in height as showers come and go, some low patches in heaviest showers; best breaks Carneddau to Bala area.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Soon mostly sunny, a patchwork of cloud forming, sometimes cloudier towards Cardigan Bay. Visibility varying, at times very good, but hazier coasts and reducing in rain.
How Cold? (at 900m)
Humid 11C or above from dawn, soon lowering but varying through the day, finishing at a fresher 8 or 9C. Feeling near/below freezing in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 1st October 2026
Last updated
Tue 29th Sep 26 at
4:15PM
How windy? (On the summits)
Southwesterly 20-25mph, some gustiness to start. Trending stronger later, and particularly overnight.
Effect of the wind on you?
At times blustery in exposure with some buffeting in gusts and wind chill. Deteriorating overnight.
How Wet?
Showers generally easing
From dawn, showers streaming onto the mountains from the southwest, drizzly on the tops and towards Cardigan Bay. Drizzle will fade and showers less frequent with time, only local spots if any into evening.
Cloud on the hills?
Clinging to high west terrain
Fairly extensive from 600-700m upward west slopes, lower in showers. Soon beginning to lift, some variability, clearing off Carneddau soon. Banks likely cling to Snowdon with a few lower patches towards Cardigan Bay.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Patchy sunshine, extended sunny spells breaking out east of high terrain. Good visibility, a little haze building.
How Cold? (at 900m)
8C, rising a degree east of high terrain.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 2nd October 2026
Last updated
Tue 29th Sep 26 at
4:15PM
How windy? (On the summits)
Southwesterly 30-35mph, will vary both above and below this range, tops gusts approaching 45mph.
Effect of the wind on you?
Strenuous conditions on exposed tops, strongest gusts affecting balance with notable wind chill.
How Wet?
Persistent rain, steady heavy falls
Rain rarely ceases over high terrain and western areas towards Cardigan Bay, steady heavy falls lasting several hours. Falls less heavy towards Carneddau, but rain quite persistent here too.
Cloud on the hills?
Extensive, may vary on low slopes
Cloud rarely breaks above 600-700m, and slopes towards Cardigan Bay more likely shrouded to or below 400m much of the day. Bases generally higher towards Carneddau, some chance breaking towards high terrain, likely only brief.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast, often dull particularly towards the west. Hazy at best, poor visibility on high terrain.
How Cold? (at 900m)
9C. Feeling like 0C in strongest direct wind.
Freezing Level
Above the summits.
Planning Outlook
Fresher, blustery south-southwesterlies from overnight Wednesday persist on Thursday: showery in the west early but trending drier and brighter widely. A new frontal system approaches late Thursday and overnight, then Friday will be a wetter day again; rain quite frequent with extensive cloud for many and quite blustery. On Saturday, higher pressure begins expanding from the south, increasingly settling the weather in England and Wales; temperatures generally mild, some cool nights when skies are clear, also sometimes feeling humid. The following week remains mixed, some settled windows in England and Wales with bright breaks east, but more often windy, particularly Scotland with periods of rain, the wind and rain expanding more widely at times.