Mountain Weather
Information Service
Brecon Beacons Forecast

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

Moderate breeze, locally gusty
Thunderstorm
Mild

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Click here to download the latest PDF Last Updated Sat 25th May 24 at 4:13PM Last Updated Sat 25th May 24 at 4:13PM
View our low-graphics version Last Updated Sat 25th May 24 at 4:13PM Last Updated Sat 25th May 24 at 4:13PM

Viewing Forecast For

Brecon Beacons
Sunday 26th May 2024
Last updated Sat 25th May 24 at 4:13PM

Summary for all mountain areas

Low pressure system drifting from the Atlantic brings unstable weather, lot of clouds, frequent showers and more than occasional thunderstorms, especially in northern England. Strong gusts are expected by thunderstorms, especially in Welsh mountains and in Peak District. Best conditions likely in Northwest Highlands.

Headline for Brecon Beacons

Mostly cloudy, afternoon thundery. Gusty.

How windy? (On the summits)

South and southwesterly 10 to 25mph, increasing. Later gusts 30mph possible, by thunderstorms even up to 40mph.

Effect of the wind on you?

Fairly small, locally moderate for short periods. In thunderstorm vicinity walking impeded at times.

How Wet?

Local drizzle morning, later thundery showers.

Only a few light rain spots in the morning. Around noon developing showers, risk of thunderstorms. Conditions slowly improving in the evening.

Cloud on the hills?

Hills covered extensively, afternoon slowly lifting.

Clouds covering hills from start of the day, slowly lifting, uncovering most areas in the afternoon. Returning clouds possible if thunderstorm occur.

Chance of cloud free summits?

20% rising to 70%

Sunshine and air clarity?

Mostly dull, chance for some sunshine in the afternoon between the showers. Poor visibility, likely to improve while clouds lift.

How Cold? (at 750m)

8 to 10C.

Freezing Level

Above the summits.

Viewing Forecast For

Brecon Beacons
Monday 27th May 2024
Last updated Sat 25th May 24 at 4:13PM

How windy? (On the summits)

Westerly to southwesterly, 10 to 25mph.

Effect of the wind on you?

Fairly small.

How Wet?

Isolated rain morning, then mostly dry

Only a few light rain spots in the morning. Low chance of an isolated shower passing eastwards later, but generally improving conditions during the afternoon.

Cloud on the hills?

Morning often covered, later often clearing.

Hills mostly covered at start, lifting during the day, widely clearing the tops.

Chance of cloud free summits?

20% rising to 80%

Sunshine and air clarity?

Little sunshine in the afternoon coming through higher clouds. Good visibility.

How Cold? (at 750m)

6 to 9C. If exposed to stronger winds, will feel close to freezing on highest summits.

Freezing Level

Above the summits.

Viewing Forecast For

Brecon Beacons
Tuesday 28th May 2024
Last updated Sat 25th May 24 at 4:13PM

How windy? (On the summits)

Southwesterly 25 to 40mph

Effect of the wind on you?

Be prepared for very blustery or at times across western hills arduous conditions with considerable buffeting.

How Wet?

Rain breaking up into heavy showers.

A front will progress northeast bringing periods of rain and drizzle, before tending to break up into areas of showery and at times heavy rain, risk of thunder.

Cloud on the hills?

Extensive, best breaks afternoon in east.

Cloud will shroud the hills extensively through the day, Bases to lowers slopes in the west in the morning, before slow rise. Best breaks afternoon in the east.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Often overcast, but scope for some patchy sun to break through at times, mainly across east Wales. Rather murky, with poor visibility in rain.

How Cold? (at 750m)

10C, but feeling close to freezing in the wind on higher tops.

Freezing Level

Above the summits

Planning Outlook

Bank Holiday is likely to stay wet in Scotland and northern England, with widely spread showers from the Highlands to the Lakes. Occasional showers may also sweep across Pennines and Snowdonia. Warm front from the west coming on Tuesday brings more persistent, but usually less intense rain. Following this, a northerly flow and high pressure building from the west, brings optimism for improving conditions and sunnier end of the week, while temperatures likely staying similar or even dropping slightly.