Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Thunderstorms
Bursts of rain, torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Thunderstorms
Bursts of rain, torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 27th August 2026
Last updated
Wed 26th Aug 26 at
4:27PM
Summary for all mountain areas
Heavy, thundery rain moves north through Wales and England, showery thunderstorms following in Wales; beware sudden gusts, rapidly rising streams, and local flooding. Hill cloud and a little patchy rain in east Scotland; much of west Scotland clear of cloud, though some haze around.
Headline for Eryri / Snowdonia National Park
Thundery rain most of the day; risk local flooding
How windy? (On the summits)
Southeasterly 25-35mph, gradually easing and shifting southwesterly, later settling near 15-20mph, or locally lighter.
Effect of the wind on you?
Strenuous walking early with notable buffeting gusts affecting stability, gradually easing, towards mostly small effects later in the day.
How Wet?
Heavy rain, thundery bursts
Heavy rain setting in from dawn, thundery falls mixed in. Tending to break into more showery rain with time, but remaining rather frequent with thundery downpours continuing. Beware rapidly rising streams and local flood risk.
Cloud on the hills?
Extensive most of the day
Cloud soon fills in from at least middle slopes upward, patches increasingly lower into valleys during heaviest rain. Later as rain breaks, lifting, but slopes towards Cardigan Bay will be slow to clear above 700-800m, and high tops may not clear.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Soon overcast and dull with poor visibility. Some late patchy sunshine with very good visibility away from fog and showers.
How Cold? (at 900m)
13 to 15C, perhaps warmest in the morning on west slopes; fluctuating by several degrees around showers.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th August 2026
Last updated
Wed 26th Aug 26 at
4:27PM
How windy? (On the summits)
Southwesterly 15-20mph, some gustiness; later shifting westerly, perhaps lessening for a time.
Effect of the wind on you?
Fairly small, gusty periods on high terrain.
How Wet?
Drizzle, showery rain
Often drizzly on the high tops and upper western slopes. Spotty rain drifts from the southwest, more frequent showery rain forming, for a few hours at least. May break later, but staying damp on high terrain.
Cloud on the hills?
Fairly extensive
Hills shrouded from middle slopes up at least in the morning, rising but western slopes unlikely to break above 700-800m. Higher bases towards Carneddau for a time, but variably lowering again where heavier showery rain arrives.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun toward the east, otherwise cloudy. Varied visibility, though very good where out of cloud and rain.
How Cold? (at 900m)
11 or 12C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th August 2026
Last updated
Wed 26th Aug 26 at
4:27PM
How windy? (On the summits)
Generally southwesterly, some variability, 25-35mph, and may strengthen further for a time with stronger gusts.
Effect of the wind on you?
Walking at times strenuous on high terrain, strongest gusts impacting balance with a chilly feeling.
How Wet?
Rain most of the day
Rain through most of morning, heavy falls come and go. Rain will ease somewhat, and perhaps break briefly, though staying drizzly on high terrain and western slopes, with patchy areas of rain returning too.
Cloud on the hills?
Extensive
Cloud rarely breaking above 500m, bases regularly approaching low slopes, and to valley level on western slopes during heaviest rain. A brief window of higher bases likely but high terrain stays shrouded.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
10 to 12C. Feeling around 5C in strongest wind.
Freezing Level
Above the summits.
Planning Outlook
Heavy, thundery rain affects England, Wales & eastern Scotland on Friday, prolonged heavy falls bringing a risk of local flooding. A westerly wind will establish over the weekend, drawing cloud and drizzle onto western high terrain, several frontal systems sweeping more broadly across the country. The strongest wind and heavy rain may pass mostly across England and Wales, with the lightest rain in Scotland. Hills often shrouded in cloud, low patches around rain; only local improvements. A west-southwesterly weather track prevails next week: cloud and drizzle on western hill groups (particularly west Scotland), breezy with areas of rain regularly spreading widely at times. A few brighter interludes through the week, and a chance of a more settled window in the south into the weekend.