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.
Friday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
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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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
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
Friday 5th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
Summary for all mountain areas
South-southeasterly winds strengthen, reaching gale-force afternoon many areas, sooner Wales, here becoming severe. Some rain / hill snow NE Scotland fades, patchy rain west coasts, otherwise dry, then rain sweeps in from southwest later, snow inland mountains into evening. Best cloud breaks NW Scotland.
Headline for Brecon Beacons
Gales strengthen to become severe. Heavy rain develops.
How windy? (On the summits)
Southerly 30-35mph soon from dawn, rising to 50mph middle of day, reaching 60mph high tops afternoon with stronger gusts high tops. Turning southwesterly after dark, easing marginally but still mostly 40-50mph.
Effect of the wind on you?
Strenuous walking early deteriorates to widely challenging conditions with powerful gusts, by afternoon enough to knock you over. Significant wind chill.
How Wet?
Rain sets in widely, heavy afternoon
Patchy showery rain drifts inland from the south early, though eastern hills dry much of morning. Rain merging into broader areas then setting in widely around the midday hours with heavy falls onward into evening and night. Streams again rising to be in spate, flooding developing into night.
Cloud on the hills?
Becoming extensive
From dawn cloud likely caps the high tops with banks on high western terrain; Black Mountain perhaps clear. Soon lowering widely towards 600-700m as rain arrives, as low as 400m south and westernmost slopes.
Chance of cloud free summits?
30% dropping to almost nil in rain.
Sunshine and air clarity?
Overcast, high cloud lowering during morning to become increasingly dull. Visibility becomes poor as rain sets in.
How Cold? (at 750m)
3C, rising to 5C, remaining warmer into night. Rising temperature offset by wind chill, feeling like -10C in exposure.
Freezing Level
700-800m, rising above the summits through morning.
Viewing Forecast For
Brecon Beacons
Saturday 6th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
How windy? (On the summits)
Southwesterly 35 to 45mph, risk often 50mph high tops.
Effect of the wind on you?
Challenging walking conditions, frequent buffeting affecting balance on exposed tops and ridges; marked wind chill.
How Wet?
Frequent showery rain
Rain on and off most or all day, a mix of drizzle where in cloud and some steadier rain, but heavier showery bursts coming in from west, possible hail.
Cloud on the hills?
Fairly extensive tops
Often covering higher slopes, bases varied in and out of rain, mostly 600 to 800m. More frequent to mid-slopes western areas. Some breaks higher up east and mid-Wales.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun mostly east. Visibility varied, poor in rain, intermittently good out of cloud.
How Cold? (at 750m)
5C. Wind chill feeling like -7 to -10C.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Sunday 7th December 2025
Last updated
Thu 4th Dec 25 at
3:25PM
How windy? (On the summits)
Very uncertain speeds: South turning southwesterly, 25 to 40mph, risk often stronger, chance becoming 50mph+
Effect of the wind on you?
Expect blustery conditions, beware potential for arduous conditions all day, possibly widely more difficult.
How Wet?
Rain likely, risk heavy
Risk of rain fairly persistent, setting in for steady or heavy rain for a few hours at least.
Cloud on the hills?
Extensive
Shrouding the hills widely, with banks of cloud from low to mid elevations upward.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Generally cloudy and misty, poor visibility likely most hills.
How Cold? (at 750m)
8C, fairly small variation with height. Feeling below freezing in the wind.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through the weekend and into next week with areas of low pressure circulating near to the British Isles. Day-to-day detail will be uncertain even in short-range as complex systems move around slowly - a series of frontal systems bringing spells of rain and some high-level snow, mixed with showers with hail mostly near western coasts. Temperatures often on the milder side compared to recently, with typically only higher tops in the Highlands intermittently just below freezing point, expect periods of thawing up to these tops. Wind speeds will also vary, often south to southwesterlies, at times reaching gale force on tops, but intermittent lulls.