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
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Brecon Beacons
Tuesday 16th December 2025
Last updated
Mon 15th Dec 25 at
4:00PM
Summary for all mountain areas
Showery in western Scotland, with hail, snow on higher mountains; fewer showers eastwards, more sun and higher cloud breaks. Strongest winds in NW Highlands, up to gale force tops. England and Wales largely dry and bright, patchy cloud western tops.
Headline for Brecon Beacons
Light-moderate breeze. Dry with sun, cloud patches west.
How windy? (On the summits)
Northwesterly 10 to 20mph, dropping lighter with time during day. Starting to strengthen onward into night, well beyond midnight 30-35mph.
Effect of the wind on you?
Fairly small. Deteriorating into night.
How Wet?
Largely dry
Remnants of overnight rain may linger up to dawn, but a dry daytime overall. Chance of an odd light shower near coast. Very wet underfoot following previous heavy rain, streams in spate, flooding.
Cloud on the hills?
Patches higher and western tops
Patchy cloud banks most common west Wales, may come and go above 600-700m toward Cardigan Bay. Some varied banks elsewhere from dawn, but largely clearing inland and eastwards.
Chance of cloud free summits?
60% rising to 80%
Sunshine and air clarity?
Early cloudy skies, high cloud tending to thin to reveal some sun, soonest in west. Visibility increasingly excellent.
How Cold? (at 750m)
3C. Feeling like -3C directly in the breeze.
Freezing Level
Above highest summits. Slight frost sheltered valleys in morning.
Viewing Forecast For
Brecon Beacons
Wednesday 17th December 2025
Last updated
Mon 15th Dec 25 at
4:00PM
How windy? (On the summits)
South-southwesterly 40 to 50mph, risk 60mph high tops, local powerful gusts north of higher summits.
Effect of the wind on you?
Challenging conditions over the hills, walking difficult in places higher up, sudden buffeting to some mid-slopes.
How Wet?
Rain soon develops
Rain moving in from west soon from dawn, setting in persistently over western hills, increasingly Brecon Beacons, some heavy falls; patchier further east into mid-Wales.
Cloud on the hills?
Increasingly extensive
Lowering in morning to blanket most hills, from mid-to-lower slopes in west and south of Brecon. Higher bases toward Black Mountains, but rarely above the tops.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast, increasingly murky.
How Cold? (at 750m)
3C rising during day to 6C. Feeling like -7 to -10C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Brecon Beacons
Thursday 18th December 2025
Last updated
Mon 15th Dec 25 at
4:00PM
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?
Threat prolonged heavy rain
A persistent swathe of rain may continue to affect southern Wales, sustained heavy falls possible with ongoing flooding.
Cloud on the hills?
Extensive
Likely to shroud the hills widely all day, from low-to-mid slopes upward.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and murky if rain persists.
How Cold? (at 750m)
4 or 5C. Wind chill feeling like -5 to 7C on tops.
Freezing Level
Above the summits.
Planning Outlook
An unsettled southwesterly weather pattern continues mid-late this week. On Wednesday, another system sweeps in from the Atlantic bringing further rain and gales. Showery conditions then persist in western Scotland, with hail and snow on high tops. Scottish mountains often near or below freezing above 900m, only brief thawing higher up. Meanwhile, England and Wales stay mild midweek with more heavy rain likely into Thursday, then lowering to freezing on high tops for periods from Friday. A change of weather pattern is likely in the run up to Christmas, as high pressure builds northward, bringing drier weather, fog and frost more common.