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.
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.
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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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.
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
Brecon Beacons
Thursday 25th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
Summary for all mountain areas
An even hotter day across the mountains; sunny and humid - risk of sunburn and dehydration. Rain soon arrives into Northwest Highlands, thunderstorms afternoon, later stretching east and south. Moderate breezes, lightest early, strengthening into evening, walking becoming strenuous over high tops.
Headline for Brecon Beacons
Hot, humid sunshine; wind strengthens, notably later
How windy? (On the summits)
South to southeasterly between 15 and 25mph; gusty at times, risk stronger western hills, to 35mph, with stronger sustained wind into nighttime.
Effect of the wind on you?
Fairly small, although there may be sudden buffeting at times both on higher areas and some lower slopes, and deteriorating into nighttime.
How Wet?
Likely dry during daytime
Small risk of heavy showers/thunderstorms developing later afternoon giving locally torrential rain. This risk rises as dusk approaches and greater threat of thunderstorms into night.
Cloud on the hills?
Likely none though patches may form if rain occurs
A few well-scattered patches of ragged fog at dawn, soon dissipating after sunrise for cloud-free hills. A low chance of some patchy cloud reforming on high terrain later if thunderstorms occur.
Chance of cloud free summits?
Nearly certain
Sunshine and air clarity?
Mostly sunny, some patchy higher cloud around. A variable haze affecting visibility, haziest to the south.
How Cold? (at 750m)
23C rising to an exceptionally warm 26 to 29C in afternoon, very humid too. Valley temperatures locally approaching 32 to 34C, hottest temperatures likely east.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Friday 26th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
How windy? (On the summits)
South-southwesterly 15-25mph; risk stronger early with strong gusts around showers.
Effect of the wind on you?
Fairly small, but notably breezy in the morning with early buffeting gusts starting to affect stability.
How Wet?
Risk early rain/thunderstorms
From before dawn, risk scattered bursts of heavy rain or thunderstorms. These likely drift north, and later afternoon may be largely dry.
Cloud on the hills?
May shroud high terrain much of the day
Other than some early ragged patchy cloud, the hills will be largely clear at dawn. Banks of cloud begin forming on upper slopes through morning, the lowest banks to 500m southern slopes for several hours, breaking somewhat later.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Some sun through high cloud, probably more overcast for a period. Visibility improves after morning haze lifts.
How Cold? (at 750m)
Hot and humid 22 to 24C from overnight, cooling to 17 to 19C with time, coolest west (perhaps 16C Preseli hills).
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Saturday 27th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
How windy? (On the summits)
Southerly, some uncertainty of peak speed, in range 25mph to possibly 40mph, at least in gusts on exposed high terrain.
Effect of the wind on you?
Blustery over high terrain, some buffeting gusts making walking uncomfortable in places.
How Wet?
Bursts of rain, risk thunder
High uncertainty of detail, but expect clusters of heavy showery rain tracking northeastward throughout the day. Lengthy drier windows possible, but risk sudden downpours, thunder and lightning.
Cloud on the hills?
Varied, lowest early and in showers
Patchy cloud banks, risk more extensive southern slopes early in day. Rising and breaking into middle of day, best east and mid Wales. In rain, lowering, filling in again, low ragged patches.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Occasional sun, but high cloud covering sky for periods. Some mistiness in morning. Visibility often good, but occasionally poor in rain.
How Cold? (at 750m)
14 to 16C, typically warmest east, small variation all day. Still rather humid. Feeling cooler directly in wind.
Freezing Level
Above the summits.
Planning Outlook
Exceptionally warm and humid most mountain areas until later Friday; valley temperatures approaching the low-to-middle 30s in England and Wales, with hill temperatures approaching the mid-to-high 20s. Scotland will be slightly cooler, though temperatures will still reach the low 20s on many slopes. A risk of extended torrential thunderstorms on Friday afternoon in northern areas. Thunderstorms may continue in the north on Saturday as well, but progressively less warm as the weekend goes: fronts begin to come in off the Atlantic, bringing a strengthening wind and bands of rain and low cloud, particularly affecting western mountains. Into next week, Atlantic westerlies will dominate with mixed weather.