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
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Brecon Beacons
Sunday 13th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
Summary for all mountain areas
A fine day for most places with light winds. Varied cloud around some hill slopes early in the day tending to lift and break, sunny spells. Risk of more cloud lingering over hills in Wales, some rain and drizzle in the south as a front stays nearby. Southwesterly breezes increase later western Scotland.
Headline for Brecon Beacons
Low cloud, drizzly rain south, tending to improve; moderate breeze.
How windy? (On the summits)
Westerly 20-25mph at dawn, easing a little to 15-20mph strongest toward south, then tending to rise again later in day to 25mph.
Effect of the wind on you?
Feeling chilly in a fresh breeze particularly early morning, becoming fairly small for a time, but likely feeling breezier again later.
How Wet?
Early rain clears, some drizzly rain may linger in south
Very wet underfoot from heavy overnight rain, fast-flowing streams and surface water. Remnants of rain likely continue into early morning but clearing southeastward. Some drizzle may come and go on southern hills, locally risk more persistent for periods southernmost areas, but substantially dry toward mid-Wales.
Cloud on the hills?
Covering hills widely early in day, slow to lift and break in south
Low cloud fairly extensive from dawn, to some lower slopes in south and western areas. May linger for several hours over southern hills, the base tending to rise to 600-700m, then breaks emerging gradually, soonest on eastern hills. By evening, low cloud likely to roll back in from the southwest to become extensive again.
Chance of cloud free summits?
10% rising to 60% into afternoon, lowering again evening onward.
Sunshine and air clarity?
Fairly cloudy, some glimpses of sun mostly eastern mid-Wales, may brighten up a little more widely with time. Murky at first, visibility stays poor around drizzle and low cloud, but tending to become good many places.
How Cold? (at 750m)
12C, little change all day and night, slightly warmer in east afternoon; quite humid. Feeling like 5C in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Monday 14th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
How windy? (On the summits)
Southwesterly 30 to 40mph, speed likely rising slightly, some notable strong gusts especially eastern downslopes.
Effect of the wind on you?
Frequent buffeting over the hills, very gusty in places affecting stability, not just highest terrain. Marked chill factor despite mild air.
How Wet?
Rain and drizzle, risk heavier bursts
Drizzle and light rain already fairly extensive from dawn, continuing onward throughout the daytime, steadier falls of rain over west & southwest hills. Possibly an isolated thundery burst forming.
Cloud on the hills?
Extensive very low cloud
Blanket cloud shrouding the hills, from lower slopes upward on south and western hills. Bases higher toward Brecon and the Black Mountains, but rare above 600m, local breaks mainly east-mid Wales.
Chance of cloud free summits?
Below 10%
Sunshine and air clarity?
Overcast and dull, misty or murky to lower slopes in west and south, local brighter areas toward east-mid Wales.
How Cold? (at 750m)
15C, humid, little change all day, then starting to lower slightly into night. Feeling like 2 to 5C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Tuesday 15th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
How windy? (On the summits)
Westerly 20 to 30mph, possibly 35-40mph briefly early in day.
Effect of the wind on you?
Blustery across the hills, starting to affect comfortable walking on exposed high terrain and feeling increasingly cool.
How Wet?
Early rain then a few showers
A band of rain passing southeastward around dawn, briefly heavy. Drier for a time, then occasional showery rain develops, most common west Wales.
Cloud on the hills?
Mostly higher areas in morning
Fairly extensive across higher slopes at first, ragged patches from mid-slopes up, but soon breaking to leave patches over higher slopes, then increasingly clearing.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Occasional sun. Visibility mostly very good.
How Cold? (at 750m)
9 to 12C, mildest early in day, trending cooler during daytime. Feeling increasingly near 0C in the wind.
Freezing Level
Above the summits.
Planning Outlook
Staying unsettled during the next week to 10 days as westerlies prevail - areas of low pressure passing north of Scotland with frontal systems bringing frequent rain, wettest over western mountains in Scotland. Often windy, gale-force westerly winds for periods over higher terrain. Fairly warm and humid on Monday, then on the cooler side for several days, with considerable wind chill on the mountains. Higher pressure and better weather tends to expand further north later in month.