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.
Monday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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.
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
Monday 18th May 2026
Last updated
Sun 17th May 26 at
4:27PM
Summary for all mountain areas
Variable hill cloud at dawn, early rain in Wales into Lakeland and south/eastern Scotland; NW Scotland starts clear. Most cloud lifts to or above summits. Heavy afternoon showers build over the Pennines northward across most of Scotland; risk hail and local thunder. Risk lingering rain south Wales.
Headline for Brecon Beacons
Showery rain may linger, best chance breaks north slopes
How windy? (On the summits)
Southwesterly 10-15mph, but may be stronger up to dawn. Shifting southerly as evening approaches and rising towards 20-25mph, further deteriorating overnight. Strongest wind always in the west.
Effect of the wind on you?
Fairly small.
How Wet?
Showery rain
Showery rain over the mountains from before dawn will tend to ease and isolate to southern slopes, though beware risk of showers lingering more widely. As evening approaches, rain returns from the southwest and spreads widely overnight.
Cloud on the hills?
Fairly extensive early, lifting towards summits, breaks possible
Varied cloud banks around hills in morning, particularly south and west areas where may be extensive. Lifting higher, likely to just high terrain or tops, though some caps may cling to southern slopes if rain does not cease. Lowering back onto tops more extensively late in the day.
Chance of cloud free summits?
30% rising to 70%; lowering later.
Sunshine and air clarity?
Variable cloud, few glimpses of sun, high cloud tends to build to cover the sky afternoon, increasingly overcast. Visibility very good, reducing rain.
How Cold? (at 750m)
3C rising to 6C; staying elevated into night and may rise further. If exposed to increasing wind later, feeling nearer -5C, or colder toward dusk.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Tuesday 19th May 2026
Last updated
Sun 17th May 26 at
4:27PM
How windy? (On the summits)
Southwesterly 35-45mph most of the day, gusty over tops and high passes. May ease slightly for a few morning hours.
Effect of the wind on you?
Walking often at least strenuous on high summits with wind chill. Effects may ease for a few hours after morning.
How Wet?
Often raining, sometimes heavy
Persistent rain from before dawn lingers into the morning. Rain eases but remains frequent, most frequent on south and western slopes with heavy moments; risk of isolated hail and thunder. Wet underfoot and slippery rock surfaces.
Cloud on the hills?
Fairly extensive
Extensive to low slopes at dawn. Through morning, tending to lift, some breaks forming towards east Wales up to 700m on north slopes. West and southern slopes remain in cloud, at times to low slopes; any breaks above 600m rare and brief.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun in the morning, then later in the day too, otherwise largely cloudy. Visibility often poor due to rain and haze, locally better.
How Cold? (at 750m)
7 to 9C. Feeling like -5 to -8C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Wednesday 20th May 2026
Last updated
Sun 17th May 26 at
4:27PM
How windy? (On the summits)
West-southwesterly 25-40mph, risk quite gusty over high terrain.
Effect of the wind on you?
Walking impeded in exposure and often strenuous and feeling chilly; considerable buffeting possible over high terrain.
How Wet?
Some drizzly rain
Raining from before dawn, but through morning the rain likely eases, becoming light and patchy and perhaps largely dry by day's end. High summits and west slopes may remain in a drizzly cloud into the afternoon.
Cloud on the hills?
Fairly extensive particularly west
A sheet of cloud shrouds the hills at dawn, to lower western slopes. Bases slowly lift towards 700m on east and northern slopes, a few high breaks possible later in the day. High tops will struggle to clear, and west/southern slopes stay shrouded above 500-600m.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Glimpses of sun. Visibility starts poor, improving as cloud and rain ease.
How Cold? (at 750m)
7 to 9C, mildest Black Mountains. Feeling below freezing in strongest direct wind.
Freezing Level
Above the summits.
Planning Outlook
A mixed but milder outlook. Damp southwesterlies prevail for a few days as mid-week approaches with regular rain and showers, most on western hills where drizzly rain may persist between showers and persistent low cloud. Expect increasingly wet conditions underfoot and slippery rock surfaces. Also, a risk of isolated hail and lightening in the showers; showers may be enhanced in eastern Scotland in sea breezes. Indications of rising pressure later in the week, brining milder and drier conditions to England and Wales. However, some drizzle and low cloud may continue to affect western hills, with periods of rain and wind continuing to affect Scotland. Pressure may continue to rise into the weekend, allowing for warmer and sunnier conditions, but some fronts and lingering humidity will bring local periods of rain.