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.
Sunday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
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
Sunday 27th September 2026
Last updated
Sat 26th Sep 26 at
4:30PM
Summary for all mountain areas
Southerly winds up to gale-force on high terrain, including a swathe of particularly powerful winds and gusts moving across England & Wales during the day. Rain generally sets in from the west with some heavy falls, a band of more intense rain for a time. Cloud increasingly covering many hills.
Headline for Brecon Beacons
Wind strengthens to powerful gusts, rain moves in heavier.
How windy? (On the summits)
Southerly 40mph soon from dawn, strengthening in morning, abruptly reaching 50mph, stronger gusts mainly western hills for an hour or so into middle of day. Then W-SW'ly tending to lessen in afternoon to 20-25mph.
Effect of the wind on you?
Increasingly arduous in exposure in morning, strongest gusts affecting balance with notable wind chill despite mild air. Then improving afternoon to become smaller later in day.
How Wet?
Heavy rain for a time
Mostly dry early, then rain becomes frequent from west, setting in for several hours, a swathe of heavy rain passing eastward through middle of day, briefly torrential, risk thunder. Breaking up later to just brief showers and more often dry.
Cloud on the hills?
Increasingly covering high terrain
Little to start, then ragged patches lowering onto western tops, increasingly spreading east, lowering more widely to cover most high terrain, bases locally to 400-500m southern slopes during heaviest rain. Lifting again later.
Chance of cloud free summits?
80% lowering to 30% in rain
Sunshine and air clarity?
Early weak sun soon gives way to overcast skies; brightening up again later in day. Very good visibility, deteriorating with cloud/rain, poor for a time.
How Cold? (at 750m)
9C rising to 13C, notably cooling into night. Feeling like 1 to 3C in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Monday 28th September 2026
Last updated
Sat 26th Sep 26 at
4:30PM
How windy? (On the summits)
Variable west turning southerly, 10mph or often less.
Effect of the wind on you?
Small.
How Wet?
Rain unlikely
Cloud on the hills?
Largely clear
Patchy mist around some valleys from dawn, may drift briefly onto some lower hill slopes, but all dispersing.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Patchwork of cloud and sun, some thin high cloud in the morning. Visibility excellent.
How Cold? (at 750m)
6C rising 11C.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Tuesday 29th September 2026
Last updated
Sat 26th Sep 26 at
4:30PM
How windy? (On the summits)
South-southeasterly 40 to 60mph, turbulent gusts around higher tops and in places downslope toward the north.
Effect of the wind on you?
Challenging walking conditions on exposed terrain, but sudden buffeting also to some lower elevations.
How Wet?
Risk persistent rain and drizzle
Spots of rain frequently, drizzly where in cloud; some steadier pulses of rain spreading from the south, which may set in for more constant falls on Brecon Beacons.
Cloud on the hills?
Covering many hills, may improve
Fairly extensive cloud over the hills, from some lower elevations upward in the morning on south-facing slopes. May thin and break a little, best of breaks forming toward western Cambrians.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Some glimpses of weak sun through high cloud mostly west coastal areas. Hazy, murky southern areas.
How Cold? (at 750m)
13 to 15C, feeling humid; then only slight drop onward into night.
Freezing Level
Above the summits.
Planning Outlook
A changeable prospect during the week ahead. A better day on Monday as higher pressure expands in from the south, but showers and brisk winds continue toward northwest Scotland. Strong southeasterly winds by Tuesday, widely gales on mountains with turbulent downslope gusts toward the west; a risk of rain developing from the south during the day, becoming heavy later. Blustery south-southwesterlies into Wednesday and Thursday, showery in the west. Higher pressure tends to expand further north again into early October. Mostly mild temperatures.