Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for initially unsettled conditions probably giving way to temporary drier and settled conditions Tuesday and Wednesday.

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

Mainly dry with sunny spells and light winds today. Outbreaks of rain arriving later.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Cloudy Sunny intervals Sunny intervals Partly cloudy (night) Heavy rain
Chance of precipitation
(at 600m)
40% 20% <05% <05% 10% 70%

Wind direction and speed (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m NW
17
NW
16
W
15
SW
17
S
19
S
23
300m W
8
W
9
W
10
SW
11
SW
8
S
12
Valley W
8
W
8
W
9
W
10
SW
5
S
10
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m 22 20 20 22 25 30
300m 18 18 18 21 20 27
Valley 19 18 18 21 16 25

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
Valley
Freezing Level
800m
700m
700m
700m
900m
1,100m

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

Additional weather information

Meteorologist's view

A ridge of high pressure moving east will give a window of settled weather today with some good sunshine for several hours. Note the deteriorating conditions from early evening with winds strengthening slightly and rain arriving.

Weather

Cloudy initially with some patchy rain, most likely across eastern areas. Soon becoming dry this morning with good spells of sunshine developing for much of the day. Cloud and outbreaks of rain will spread east from early evening, with the rain becoming heavy late evening.

Chance of cloud-free hill tops

60% at first becoming 90% this morning, then becoming 50% this evening.

Low cloud and visibility

Occasional cloud above 600m at first, mainly across northern and eastern areas, soon clearing this morning. Cloud becoming occasional above 600m this evening. Visibility outside of cloud mainly good but reductions to a few km or less with rain this evening.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
6.8mm29mm31.8mm
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

Spells of rain, heavy at times through the morning, and also drizzle, combined with winds which gradually strengthen to become strong. However, some temporary drier spells are possible through the afternoon.

Chance of cloud-free hill tops

50%, perhaps temporarily improving 90% for the afternoon.

Maximum wind speed expected

South or Southwest 30 mph gusts 40-45 mph.

Temperature

  • At 600m 4C rising to 7C.
  • Valley Plus 6C rising to 10 or 11C.
  • Freezing level Above summits.

Low cloud and visibility

Occasional poor visibility with cloud and fog down to 600-700m, lower at times on southern slopes overnight and through the morning. Through the afternoon cloud may temporarily lift above summits across northern areas. Visibility outside of cloud mainly good but reductions to a few km or less with rain or drizzle.

Mountain weather information

Mon 2 Mar

Sunrise:
Sunset:

Rain, sometimes heavy through the morning, gradually eases to become light and patchy. Strong southerly winds easing. Freezing level above summits.

Tue 3 Mar

Sunrise:
Sunset:

Low confidence at this stage but dry and brighter conditions with light winds look likely. Freezing level above summits.

Wed 4 Mar

Sunrise:
Sunset:

Dry conditions are likely, although outbreaks of light rain and strengthening winds may arrive later.

Updated at:

Summit specific forecast

Mountain summit forecast map

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