Brecon Beacons
Includes all higher summits in the southern half of Wales: the Bannau Brycheiniog / Brecon Beacons National Park, southern Cambrian Mountains and highest Preseli hills.
Monday'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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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
Brecon Beacons
Monday 17th August 2026
Last updated
Sun 16th Aug 26 at
3:56PM
Summary for all mountain areas
Much of the Highlands largely dry well into the afternoon with light winds, but some local patchy light rain and varied cloud. Rain develops from the west later, setting in heavy into evening. England and Wales sees patchy rain, drizzle and low cloud, though mid & south Wales tends to improve.
Headline for Brecon Beacons
Low cloud and early dampness, improving. Light-moderate breeze.
How windy? (On the summits)
Westerly 20mph early morning, easing a little to 10-15mph into middle of day, then rising later in day, to 20-25mph by dusk, 30-35mph into night.
Effect of the wind on you?
Fairly small.
How Wet?
A little rain early in day, then dry until night
Patchy light rain and drizzle in the morning, mostly small amounts, but western hills may be damp for a couple of hours early in day. Tending to fade to be largely dry middle of day onward through dusk. Into night, rain develops from the northwest, becoming heavy in west.
Cloud on the hills?
Low cloud in morning rising and breaking
Fairly extensive cloud across the hills in morning above 500-700m, lowest toward west. Tending to rise and break toward most tops into the afternoon, some patches may come and go in west.
Chance of cloud free summits?
30% rising to 80% afternoon
Sunshine and air clarity?
Largely cloudy morning, then becoming brighter with some sun breaking through thin high cloud. Visibility improving to be very good, but locally smoky due to fires.
How Cold? (at 750m)
12C rising to 16C afternoon.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Tuesday 18th August 2026
Last updated
Sun 16th Aug 26 at
3:56PM
How windy? (On the summits)
Westerly 20 to 35mph, strongest sustained speeds and very gusty early in the day.
Effect of the wind on you?
Affecting comfortable walking on higher terrain, for a time more challenging in exposure. Marked wind chill.
How Wet?
Early rain then showers
Rain from overnight likely continues to dawn, but soon clears southward to showery rain, then just scattered showers.
Cloud on the hills?
Low cloud lifting
Blanket low cloud across hills at first, to lower elevations south and western aspects. Rising and breaking with time.
Chance of cloud free summits?
20% rising to 60%
Sunshine and air clarity?
Overcast start, improving to brighter skies with sunny spells and very good visibility.
How Cold? (at 750m)
12 to 14C, trending cooler later in day. Feeling like 3 to 5C in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Wednesday 19th August 2026
Last updated
Sun 16th Aug 26 at
3:56PM
How windy? (On the summits)
Southwesterly 20 to 30mph, may tend to increase later in day.
Effect of the wind on you?
Breezy over high terrain, affecting comfortable walking at times, risk buffeting more often later; feeling rather cool.
How Wet?
Showers
Showery rain most frequent in western areas in the morning, but scattered mostly light showers passing eastwards during the day, an odd heavier fall briefly locally.
Cloud on the hills?
Lifting with breaks to tops
Covering many western tops above 600-800m in the morning; base tending to rise, breaks forming toward upper slopes, brief patches grazing higher tops.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sun mostly east in the morning, otherwise often cloudy; some sun later near coast. Visibility mostly very good.
How Cold? (at 750m)
8 to 10C, coolest west in morning. Feeling close to freezing directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
Rain spreads to most places on Monday night as a frontal system moves eastward. Low pressure to the north will gradually drift south to envelop most of Britain into midweek, bringing showery conditions widely, some more organised bands of rain at times. Some heavy and thundery downpours forming, mostly into the afternoons in the second half of this week, becoming focused further south with time. Fresh westerly winds turning northerly and temperature lowering later in the week, dropping close to freezing on high Scottish tops by Friday and frost may occur in Highland glens over a couple of nights. Drier weather is likely by the weekend as higher pressure builds.