Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
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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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.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
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
Saturday 29th August 2026
Last updated
Fri 28th Aug 26 at
4:29PM
Summary for all mountain areas
Northerly winds bring cloud and some light rain to northern Scotland, but winds fall light for much of the Highlands - varied low cloud banks tend to rise, isolated showers possible afternoon. Rain for Wales from early morning, extending further north over England during the day, often heavy, risk thunder.
Headline for Eryri / Snowdonia National Park
Rain persistent, often heavy; low cloud, varied wind.
How windy? (On the summits)
Direction varying considerably during the day - starting southerly, turning easterly before midday, then northerly by late afternoon, westerly from dusk; often in range 15 to 25mph, at times gusts over 30mph.
Effect of the wind on you?
Fairly small effect on walking, but some blustery spells over exposed high terrain.
How Wet?
Rain most of the day, heaviest sustained falls in the morning
Rain through most of morning, heavy falls come and go or in places set in persistently, risk of local thunder. Breaking up somewhat into afternoon, but rain and drizzle remains frequent over hills with some heavier bursts likely returning for periods.
Cloud on the hills?
Extensive
Cloud rarely breaking above 500m, bases regularly approaching low slopes, and to valley level on windward slopes during heaviest rain. Bases will tend to rise late in the day and break up somewhat but high summits unlikely to clear.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
10 or 11C, little change all day. Feeling around 5C in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 30th August 2026
Last updated
Fri 28th Aug 26 at
4:29PM
How windy? (On the summits)
South-southwesterly 20-25mph, strengthening, to often 35mph with some stronger gusts in showers.
Effect of the wind on you?
Ease of walking becomes affected, increasingly more strenuous conditions and marked wind chill.
How Wet?
Rain sets in, thundery bursts form
Drizzly rain affects high western hills in the morning. Patchy heavier rain drifts from the west, increasingly frequent and heavy bursts set in for several hours of persistent falls into afternoon, risk of hail and thunder.
Cloud on the hills?
Fairly extensive, brief improvement
Fairly extensive from dawn, many hills shrouded to middle slopes, particularly west. A lifting trend for a time, some high breaks forming to the east. Cloud will fill back in across high terrain and increasingly lower as rain sets in.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Some bursts of sunshine, best in the east with good visibility. Increasingly overcast, visibility turning poor.
How Cold? (at 900m)
10C rising to 12C, cooling again before evening. Feeling like 0 to 3C in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 31st August 2026
Last updated
Fri 28th Aug 26 at
4:29PM
How windy? (On the summits)
Westerly 25 to 40mph, speeds may fluctuate during day.
Effect of the wind on you?
Blustery, making walking uncomfortable on exposed high terrain, in places frequent buffeting. Marked wind chill.
How Wet?
Rain on and off, fading afternoon
Showery rain frequent for several hours, some heavier moments mixed in, then tending to improve from the west to fewer showers during the afternoon. Patchy rain returns from west into night.
Cloud on the hills?
Lowest morning, rising higher, breaks
Fairly extensive across the hills in the morning, to lower elevations for a time near west coast. The base rising toward upper slopes, increasing high breaks afternoon.
Chance of cloud free summits?
20% rising to 70%
Sunshine and air clarity?
Largely cloudy, rare glimpses of sun, then sun developing near coast and extending inland; high cloud later builds. Visibility becomes good, some haze west.
How Cold? (at 900m)
9C, little change then slightly cooler later. Feeling near or just below freezing directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
A generally unsettled outlook through the extended weekend and into the start of September with frequent rain and strong winds. Areas of low pressure and frontal systems move in from the Atlantic. Dropping cooler, notably chilly over Scottish mountains into Tuesday, close to freezing point on highest summits with significant wind chill in strong westerlies. A brief window of better conditions into Wednesday soon deteriorates from the west as southwesterly winds strengthen, reaching gale force over the mountains frequently in the second half of the week. Heavy rain most prolonged in the west where increasingly wet underfoot. Likely staying unsettled into next weekend and the following week.