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.
Tuesday'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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Brecon Beacons
Tuesday 9th December 2025
Last updated
Mon 8th Dec 25 at
4:00PM
Summary for all mountain areas
Severe conditions becoming widespread and lasting onward into the night and Wednesday - stormy conditions, hurricane-force winds on higher mountains. Heavy rain sweeping northwards across Scotland during the day, breaking up into showers for England & Wales; flooding likely.
Headline for Brecon Beacons
Stormy winds, frequent or persistent heavy rain.
How windy? (On the summits)
South later southwesterly, strengthening from overnight to 50-60mph before dawn, reaching 70mph with stronger gusts at times on higher tops, peak speeds likely into middle of day, then slight lessening into afternoon onward.
Effect of the wind on you?
Difficult mobility and significant chill factor across exposed terrain all day, the most severe conditions starting to abate later daytime; powerful gusts could knock you over even on some downslopes.
How Wet?
Rain much of the day, heavy south, flooding
Incessant heavy rain from overnight lingers after dawn. Rain breaks into showery bursts through morning, mostly west, but some heavy sustained rain returning Brecon Beacons. Beware fast-flowing streams and local floods.
Cloud on the hills?
Extensive, local improvements later
Blanket cloud from middle or lower slopes up through the morning, always lowest on south-facing. Breaks to middle slopes occurring afternoon, chance of breaks up to 600-700m Black Mountains.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Overcast and dull, some bursts of sun may come through in afternoon, mainly eastern mid-Wales. Poor visibility, may improve where rain fades, but staying hazy.
How Cold? (at 750m)
9 to 11C, sharply dropping afternoon towards 7C by nightfall. Feeling as cold as -5C in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Brecon Beacons
Wednesday 10th December 2025
Last updated
Mon 8th Dec 25 at
4:00PM
How windy? (On the summits)
Southwesterly 35 to 45mph.
Effect of the wind on you?
Challenging walking conditions over the hills with frequent buffeting; considerable wind chill.
How Wet?
Occasional showers
Patchy showery rain mostly west and southwestern areas.
Cloud on the hills?
Mostly higher western tops
Cloud base varying, mostly confined to upper slopes, most common toward western areas.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Occasional sun mostly eastern mid Wales. Slight haze, but visibility mostly fairly good.
How Cold? (at 750m)
4 or 5C. Wind chill feeling like -7C.
Freezing Level
Above the summits
Viewing Forecast For
Brecon Beacons
Thursday 11th December 2025
Last updated
Mon 8th Dec 25 at
4:00PM
How windy? (On the summits)
South-southwesterly 35 to 45mph, some uncertainty of peak speeds, risk over 50mph higher tops, mainly in west.
Effect of the wind on you?
Challenging walking conditions, risk remaining difficult over higher tops.
How Wet?
Little or no rain
Possible spots of drizzle in the air on some southern slopes.
Cloud on the hills?
Varied, risk persistent some slopes
Banks of cloud likely covering some slopes, risk persistent on areas toward the south in particular, from mid-slopes upward. Local breaks northward.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Uncertain, sun may break through, best mid-Wales. Southern areas may stay cloudy and hazy or misty.
How Cold? (at 750m)
5C, may start to drop into evening or night. Feeling like -5 to -8C in the wind.
Freezing Level
Above the summits
Planning Outlook
A very unsettled pattern as southwesterly winds prevail and low pressure systems move in from the Atlantic, sustained gales over the mountains, severe or stormy for periods. Temperatures only close to freezing on higher Scottish tops this week, even here will experience spells above freezing with thawing, leaving snow increasingly patchy, but beware some icy surfaces on the very highest tops where some refreezing occurs. Drier for most places on Thursday this week, otherwise rainfall will be frequent and heavy, sometimes showery with hail. Expect wet ground conditions and further flooding of streams and some rivers.