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
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Brecon Beacons
Thursday 18th December 2025
Last updated
Wed 17th Dec 25 at
4:35PM
Summary for all mountain areas
Scotland: South to south-west gales bringing hill fog and showers, before band of heavy, perhaps squally, rain moves up from the southwest in afternoon, snow tops. England and Wales: Heavy rain spreading north with hill fog becoming extensive with strong to gale force southerly winds.
Headline for Brecon Beacons
Southerly gales with heavy rainfall with the risk of flooding in valleys.
How windy? (On the summits)
Southerly 30 to 45mph, but direction and speed may vary, possibly lower speeds for periods during day.
Effect of the wind on you?
Expect blustery conditions, often strenuous walking and marked wind chill in exposure.
How Wet?
Prolonged heavy rain, flooding
A persistent swathe of rain sweeps into southern Wales soon from dawn, sustained widespread heavy falls much of daylight. Breaking up into showery rain and hail evening into night. Considerable flooding likely.
Cloud on the hills?
Extensive
Lowering soon to shroud the hills widely all day, from low-to-mid slopes upward.
Chance of cloud free summits?
Below 10%
Sunshine and air clarity?
Overcast and murky.
How Cold? (at 750m)
4 or 5C, then lowering to 1C into night. Wind chill feeling like -5 to -7C on tops.
Freezing Level
Above the summits, then dropping into the night to just above highest tops.
Viewing Forecast For
Brecon Beacons
Friday 19th December 2025
Last updated
Wed 17th Dec 25 at
4:35PM
How windy? (On the summits)
Southwesterly 30 to 45mph, tending to lessen a little during day.
Effect of the wind on you?
Strenuous walking conditions over higher terrain, buffeting in exposure mainly morning. Considerable wind chill.
How Wet?
Brief showers
A few showers coming inland from the west in the morning, possible hail, briefly snow on highest summits. Fading into afternoon.
Cloud on the hills?
Breaks to many tops
Patchy cloud grazing higher tops, most often western hills in morning, lifting above most tops for periods.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sun most frequent east Wales. Visibility often very good.
How Cold? (at 750m)
1 to 3C. Feeling like -10C directly in the wind.
Freezing Level
Just above highest tops, tending to rise slightly higher.
Viewing Forecast For
Brecon Beacons
Saturday 20th December 2025
Last updated
Wed 17th Dec 25 at
4:35PM
How windy? (On the summits)
South to south-easterly 25 to 40mph, but up to 50mph for a time hills west of Brecon.
Effect of the wind on you?
Walking arduous, or near west coast difficult, with a very turbulent airflow. Significant wind chill and buffeting.
How Wet?
Patchy rain, becoming persistent from west.
Patches of rain or drizzle here and there, may well become increasingly persistent from the west coast as front edges in. Particularly in the afternoon.
Cloud on the hills?
Extensive
Extensive cloud covering the hills through the day, with the lowest bases as the rain moves in.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Very likely overcast. Visibility good at times, but poor in rain.
How Cold? (at 750m)
3 or 4C
Freezing Level
Above the summits
Planning Outlook
South-southwesterly winds widely remain gale force over the mountains later this week and through into Saturday, severe upland gales for periods. Showery on Friday, most frequent in western Scotland with hail, also snow over tops. Another belt of persistent rain likely arrives onto western hills into Saturday, snow only highest Scottish tops. A switch to east-southeasterly winds by Sunday into early next week, some residual rain and high-level snow, but a drier theme develops and favouring chillier conditions into the Christmas period.