Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 12th August 2026
Last updated
Tue 11th Aug 26 at
3:50PM
Summary for all mountain areas
Blustery on high terrain in Scotland, gusts pushing downslope in places. Scattered showery rain in the west, a few heavy bursts; some showers push east with time. Dry with hot sun and little wind for England and Wales, just some patchy high cloud in the north; beware risk of sunburn and dehydration.
Headline for Eryri / Snowdonia National Park
Hot and mostly sunny; risk sunburn and dehydration
How windy? (On the summits)
Southerly 10-15mph; strongest breezes early and late in the day will approach 20mph.
Effect of the wind on you?
Negligible most of the day.
How Wet?
No rain expected
Cloud on the hills?
No cloud expected
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Extensive sunshine, some high cloud from time to time. Good visibility although a haze.
How Cold? (at 900m)
16C rising to 23C. Valley temperatures will approach 30C or warmer easternmost areas. Only small drop overnight.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 13th August 2026
Last updated
Tue 11th Aug 26 at
3:50PM
How windy? (On the summits)
Southerly 20-30mph just at dawn, soon easing, trending westerly with some variability, 10-15mph.
Effect of the wind on you?
Blustery in exposure for a few early hours, easing to small effects.
How Wet?
Most likely dry
Small chance a few spots of rain but more likely dry.
Cloud on the hills?
Little if any
A rising chance of cloud banks arriving onto west coastal slopes late in the day, not necessarily on the summits.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Periods of sunshine - sometimes through high level cloud. Hazy.
How Cold? (at 900m)
Reaching an unusually warm 20 to perhaps 25C, hottest east; valley temperatures approach 30C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 14th August 2026
Last updated
Tue 11th Aug 26 at
3:50PM
How windy? (On the summits)
Westerly 10-15mph. Later, shifting northwesterly and strengthening somewhat.
Effect of the wind on you?
Small.
How Wet?
Patchy rain and drizzle
From dawn, light patchy rain affects many hills with a drizzle on high tops and western hills. Rain will become more frequent with heavy bursts for a few hours, at least.
Cloud on the hills?
Soon extensive
Cloud shrouds high terrain from dawn, and likely many western slopes, soon spreading widely to at least middle slopes, or lower patches on windward western slopes during rain. May start to break late in the day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Soon overcast and dull. Visibility increasingly poor with cloud and rain.
How Cold? (at 900m)
17C lowering to 11C.
Freezing Level
Above the summits.
Planning Outlook
Thursday remains dry and exceptionally hot across England and Wales; very dry ground conditions. Rain will begin to spread across Scotland through Thursday, this slipping into England and Wales on Friday and bringing a fresher breeze with its passing. Though weekend, high pressure is never far away to the southwest, keeping conditions generally drier and brighter across England and Wales, though a northwesterly flow will bring some cloud to western hills. Scotland is more often cloud with patchy rain in the north and west. Mixed conditions early next week with patchy rain and sunny bursts here and there. With time, a trend towards stronger westerly winds with a few spells of more widespread rain; forecast confidence is low beyond the weekend.