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.
Wednesday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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
Wednesday 17th September 2025
Last updated
Tue 16th Sep 25 at
4:30PM
Summary for all mountain areas
Strong upland wind, gale force at times. Persistently damp morning across all west-coastal regions, fading to various extents into the afternoon. Extensive cloud in most areas. Very wet underfoot in England and Wales with streams in spate after heavy overnight rain.
Headline for Brecon Beacons
Morning gales, easing slightly; persistently wet
How windy? (On the summits)
Southwesterly 50mph+ in the morning, easing slightly to 35 to 40mph by midday.
Effect of the wind on you?
Difficult conditions in the morning easing to arduous in the afternoon. Feeling blustery and balance affected, particularly on ridges. Marked wind chill.
How Wet?
Persistent rain morning, may fade
Very wet underfoot and streams in spate after heavy overnight rain. Rain fairly persistent, heavy for a few hours in the morning. Frequent or constant rain will continue for a time, but likely to ease to drizzle or fade completely in the afternoon.
Cloud on the hills?
Fairly extensive
Nearest coasts, cloud from lowest slopes upwards during rain. Cloud base higher inland but blanketing hills to mid-slopes during rain. Chance of lifting a little in the afternoon.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Generally overcast, varied layers of cloud. Visibility reduced by rain, at times poor; some possible improvement if rain eases.
How Cold? (at 750m)
13C. Feeling around 0 to 5C in the wind, nearer freezing in the morning.
Freezing Level
Above the summits
Viewing Forecast For
Brecon Beacons
Thursday 18th September 2025
Last updated
Tue 16th Sep 25 at
4:30PM
How windy? (On the summits)
Forecast details still uncertain. Southwesterly 35-45mph; marked increase with height. Powerful turbulent gusts.
Effect of the wind on you?
Arduous or difficult walking conditions will make progress challenging. Powerful gusts, especially in passes, may blow you over. Marked wind chill.
How Wet?
Persistent, especially west coast
Persistent rain or heavy rain likely near the west coast and may encroach further inland. If the front is further north, then persistent drizzly on coastal up slopes.
Cloud on the hills?
Extensive
Extensive cloud down to lower west-coastal slopes where in rain. Highest cloud base in eastern mid-Wales.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Little or no sunshine in many places. Excellent visibility inland out of cloud; hazy over the Bristol Channel.
How Cold? (at 750m)
13C. Feeling near 0C in the wind.
Freezing Level
Well above the summits.
Viewing Forecast For
Brecon Beacons
Friday 19th September 2025
Last updated
Tue 16th Sep 25 at
4:30PM
How windy? (On the summits)
Southwesterly 20 to 25mph.
Effect of the wind on you?
Comfort of walking affected at times.
How Wet?
Persistent drizzle
Fairly constant drizzle and occasionally light rain, especially on mountains overlooking coastal regions. Eastern mid-Wales likely to drier.
Cloud on the hills?
Extensive
Cloud from lower slopes on mountains overlooking the sea. Cloud base will be higher well inland but any breaks will be small.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Little or no sunshine Poor visibility.
How Cold? (at 750m)
12C but feeling cooler in the wind.
Freezing Level
Above the summits.
Planning Outlook
Extensive rain and gales into midweek, likely wettest on west-coastal regions. Areas of rain and showers frequently in the forecast later in the week. Temperatures near-average, but feeling cool when exposed to wind. A chillier northwesterly may emerge by next weekend, briefly dropping near freezing on the highest Scottish tops. Indications then favour higher pressure at least briefly expanding northwards early next week for some drier days, but unlikely to settle down for long.