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.
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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Brecon Beacons
Sunday 20th September 2026
Last updated
Sat 19th Sep 26 at
4:00PM
Summary for all mountain areas
Gale-force winds over Scottish mountains early in the day lessen, but staying blustery and feeling chilly, for northern areas in particular. Showery rain in the west in the morning fading. Cloud base rising with good breaks forming, sunny spells best toward east. Lightest winds for Wales.
Headline for Brecon Beacons
Strongest wind at first, largely dry, hills clear.
How windy? (On the summits)
Westerly 25mph early morning, easing to 15-20mph, then often below 15mph by afternoon.
Effect of the wind on you?
Blustery and rather cool early in the day, but moderating to be fairly small.
How Wet?
Little or no rain
Local drizzly showers possible over west Wales early in day fading. Some drizzle returns into the night in west.
Cloud on the hills?
Lifting for a time
Patchy cloud grazing higher slopes above 700-800m in the morning, mostly in west. Tending to thin and break above the tops. Into night, blanket low cloud rolls in from west.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Varied high cloud likely thickens to cover the sky. Slight haze west and south, very good visibility eastern hills.
How Cold? (at 750m)
7C rising to 9C, then tending to rise further onward into night. Feeling close to 0C in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Monday 21st September 2026
Last updated
Sat 19th Sep 26 at
4:00PM
How windy? (On the summits)
Westerly 20-25mph early in day, some gusty slopes, but speeds tending to lessen during day to 10-15mph or less.
Effect of the wind on you?
Breezy for a time, but becoming mostly small.
How Wet?
Local drizzle
Some fine drizzle where in cloud, mostly western Cambrians; drier toward south and east Wales.
Cloud on the hills?
Lowest and most persistent west
Blanket cloud shrouding many hills, foggy from low-mid elevations up in the morning. Some highest tops may be near top of the cloud sheet. Cloud may slowly thin and lift, but western hills unlikely to clear.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Some sun mostly develops in east Wales. Misty poor visibility over hills, some improvement may develop in east, hazy then perhaps very good later.
How Cold? (at 750m)
13 to 15C, little change into night; quite humid.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Tuesday 22nd September 2026
Last updated
Sat 19th Sep 26 at
4:00PM
How windy? (On the summits)
South to southwesterly 10 to 20mph.
Effect of the wind on you?
Mostly small.
How Wet?
Damp air mostly west
Fine drizzle where in cloud and on some lower slopes too toward west Wales. More often dry eastern areas.
Cloud on the hills?
Fairly extensive, lifting higher
Low cloud from many lower hill slopes upward and some fog banks into valleys too in the morning. Cloud tending to drift higher up and breaks forming gradually, soonest in east. Banks of cloud may linger all day on south/western aspects.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, misty or hazy; glimpses of sun breaking through in places, mainly eastern valleys; some improvement during the day.
How Cold? (at 750m)
12 to 14C, humid; little change into evening and night.
Freezing Level
Above the summits.
Planning Outlook
Warm and humid air from the southwest extends across Britain early in the new week, cloaking many hills in fog and drizzle, to lower slopes near western coasts. A band of steadier rain is likely to be draped over northwest Scotland by Tuesday. Best of cloud breaks in areas further east and northeast. Rain then passes eastwards into Wednesday followed by a few showers, lower humidity and cloud bases lifting. Later in the week, areas of low pressure toward the northwest likely still bring periods of stronger winds to Scotland at least and a risk of rain at times mainly in the west, but a trend toward higher pressure and drier weather more often for the end of September into the start of October.