Mountain weather

Bannau Brycheiniog / Brecon Beacons

Yellow warning

Yellow weather warnings in force for Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

Generally high confidence for a mostly unsettled period, with Sunday giving more settled spell under a passing ridge of high pressure. Low confidence for chance of showers through Saturday.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
hazard Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Mountain weather forecast

Overnight rain clearing to a bright, largely dry day. Increasingly cold wind chill.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Light rain Light shower (day) Sunny intervals Sunny intervals Partly cloudy (night) Cloudy
Chance of precipitation
(at 600m)
80% 40% 20% 20% 20% 20%

Wind direction and speed (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m W
10
W
12
W
15
W
16
W
15
NW
21
300m W
4
W
7
W
10
W
10
W
8
NW
10
Valley SW
4
W
7
W
9
W
9
W
7
NW
9
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m 14 14 20 21 20 27
300m 9 14 18 20 18 22
Valley 9 14 18 19 17 22

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
Valley
Freezing Level
1,700m
1,200m
900m
800m
900m
800m

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
-2°
-3°
-4°
-5°
300m
Valley

Additional weather information

Meteorologist's view

Previous heavy rain may result in some flooded paths and heavy rivers. There will be an increasingly significant windchill.

Weather

Outbreaks of rain at first. Becoming dry after dawn with some bright then sunny spells developing, a few light showers possible. Cloud thickens at the end of the day with some showery rain possible, but turning dry again late evening.

Chance of cloud-free hill tops

60%, best chance middle of the day.

Low cloud and visibility

Very poor visibility to start with extensive cloud to lower slopes. Cloud lifting to give patchy cloud above 500-600m for much of this morning, then above the summits by early afternoon giving very good visibility. Cloud lowering to 600m again for a few hours this evening.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
11.8mm17mm21.6mm
Measurement date:

Rainfall data provided by Natural Resources Wales. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Sunrise:
Sunset:

Mountain weather information

Weather

Dry with clear spells through the early hours. Then a dry and bright morning with sunny spells. Cloud increases through the afternoon with a few light showers arriving, ahead of strengthening winds and rain spreading east through the evening.

Chance of cloud-free hill tops

90% or more during the day, falling to nil late evening.

Maximum wind speed expected

Northwest 20-25 mph, becoming southwest in the afternoon, strengthening to 30 gusting 45 mph in the evening.

Temperature

  • At 600m Plus 1 Celsius increasing to 3 Celsius late evening.
  • Valley Zero Celsius rising to plus 5 Celsius.
  • Freezing level 600-700m, rising above the summits in the afternoon.

Low cloud and visibility

Very good or excellent visibility through the day with no cloud expected on the hills. Visibility falling to poor in the evening in rain and extensive cloud lowering to 700m, then lower slopes by midnight.

Mountain weather information

Mon 1 Dec

Sunrise:
Sunset:

A wet and windy day with strong southwest winds giving a risk of summit gales and occasionally heavy rain. Likely to turn drier with lighter winds by evening. Freezing level above the summits.

Tue 2 Dec

Sunrise:
Sunset:

A largely bright day with sunny spells and scattered showers is expected with fresh southwest summit winds. Freezing level mostly above the summits. There will be a noticeable windchill.

Wed 3 Dec

Sunrise:
Sunset:

Most likely cloudier with scattered showers on moderate southerly winds. Showers may turn heavier later in the day. Freezing level above the summits. There will be a noticeable windchill.

Updated at:

Summit specific forecast

Mountain summit forecast map

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