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.
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 8 to 12C 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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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.
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 8 to 12C 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
Thursday 31st July 2025
Last updated
Wed 30th Jul 25 at
4:12PM
Summary for all mountain areas
Showery rain in Scotland tends to ease, cloud increasingly clearing tops of central and southeast highlands. Morning cloud and patchy rain in south Scotland and England tends to improve as well; afternoon showery outbreaks from Cheviots down the eastern Pennines. Wet and dull in Wales, improving afternoon.
Headline for Eryri / Snowdonia National Park
Morning rain, then dry; cloud lifts, some higher breaks
How windy? (On the summits)
West to northwesterly 20 to 25mph. Trending northerly and increasing into evening, 30mph or higher over tops.
Effect of the wind on you?
Starting to affect balance and comfortable walking in places on exposed tops and ridges, increasingly into evening.
How Wet?
Morning rain, breaking into occasional showers
Risk of fairly persistent rain from dawn into morning with heavy bursts. Quickly breaking into isolated showers afternoon, tending to be isolated to slopes near coasts.
Cloud on the hills?
Extensive, lifting with some breaks, best south and east
Covering the hills widely at dawn, bases down to lower slopes on coastal-facing hills. Bases rising to upper slopes with breaks forming, best south and east. High tops may see clear spells, though cloud caps regularly come and go.
Chance of cloud free summits?
30%, rising to 60%
Sunshine and air clarity?
Bursts of sun developing, clouding over at times. Visibility reduced in rain, becoming very good away from showers.
How Cold? (at 900m)
10C most of the day, slightly warmer east and mid-Wales. Slightly warmer at and before dawn.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 1st August 2025
Last updated
Wed 30th Jul 25 at
4:12PM
How windy? (On the summits)
Northwesterly 25 to 30mph, occasional stronger breezes over tops, notably early in the day.
Effect of the wind on you?
Affecting comfortable walking and balance on some higher exposed tops and ridges. Considerable wind chill.
How Wet?
Showers
Showery rain most frequent near north-facing coasts in the morning, some showers pushing increasingly inland, tending to fade with time.
Cloud on the hills?
Covering tops, some improvement
Covering higher areas fairly widely above 700-800m in morning, locally 600m or lower for a time toward north and near Llyn peninsula. Tending to rise and break toward upper slopes in afternoon, but patches may come and go high tops.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Glimpses of sun, most sun near coast in afternoon. Visibility becoming very good away from showers, slight coastal haze.
How Cold? (at 900m)
6C rising to 8 or 9C. Feeling below freezing in the wind, nearer -5C in morning higher tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 2nd August 2025
Last updated
Wed 30th Jul 25 at
4:12PM
How windy? (On the summits)
Northwesterly 15-20mph - tending to be stronger and gusty over high tops.
Effect of the wind on you?
Walking at times impeded during gusty spells, stability may be briefly challenged on exposed high terrain.
How Wet?
Little or no rain
Chance of fleeting spots of drizzly rain onto northern and western slopes in the morning. Fading for a dry day.
Cloud on the hills?
Rising and breaking, increasingly off tops
Patchy cloud at various heights above 600m in the morning, possibly more extensive on northwest aspects. Tending to rise and dissipate as the day goes, high tops increasingly out of cloud.
Chance of cloud free summits?
40%, rising to 80%
Sunshine and air clarity?
Mostly sunny, gradually weakened as patchy high cloud builds through afternoon. Excellent visibility, some haze near coasts later.
How Cold? (at 900m)
8C rising to 11C - windward coastal slopes will be slow to rise. Temperatures staying elevated overnight.
Freezing Level
Above the summits
Planning Outlook
Westerly winds prevail in the extended outlook, though the weather will be changeable. Heavy rain and strong wind is expected Saturday night and Monday, though detail remains uncertain currently. High pressure will bring a brief settled spell around midweek with a mix of cloud and sun, then occasional low pressure systems come and go - western mountains often shrouded in cloud with periods of rain, at times heavy. Some cloud and rain drifts east, mostly in Scotland. Variable winds too, at times quite blustery. Temperatures near average, variably cooler north. Ridges of higher pressure will build occasionally from the southwest for better windows of weather, particularly England & Wales.