Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for unsettled conditions with rain spreading in from the south and west at times. Confidence in the day-to-day detail decreasing through the period so please keep updated on the forecast.

Sunrise:
Sunset:

This evening forecast

Mainly dry with clear spells but some areas of mist and fog developing. Fresh southerly winds on the tops. Freezing level above summits.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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.

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.

Mountain weather forecast

Low cloud and outbreaks of rain. Cold and windy on the tops.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Fog Fog Fog Fog Heavy rain Heavy rain Light rain Heavy rain
Chance of precipitation
(at 600m)
<05% <05% 30% 60% 70% 90% 90% 90%

Wind direction and speed (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m SE
12
E
9
E
10
E
10
E
8
E
7
SE
9
SE
8
300m E
3
E
3
E
4
E
4
E
4
E
3
E
1
E
2
Valley E
2
E
2
E
3
E
4
E
4
E
3
NE
2
E
2
Wind gust (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 16 14 15 14 11 9 12 11
300m 8 7 9 9 7 6 5 6
Valley 6 7 8 9 8 6 5 5

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
Valley
Freezing Level
1,000m
1,100m
1,100m
1,300m
1,500m
1,600m
1,500m
1,600m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-2°
-1°
-1°
-1°
300m
Valley

Additional weather information

Meteorologist's view

Difficult navigation conditions due to extensive low cloud. A cold day on the tops with a significant wind chill, especially in rain and sleet.

Weather

Mainly dry overnight with areas of low cloud on the hills. Sunday will remain cloudy and misty with outbreaks of rain, becoming heavy at times. Some sleet above 800m in the morning.

Chance of cloud-free hill tops

10%.

Low cloud and visibility

Extensive cloud with bases 300-400m, occasionally down to valley level. Away from low cloud, visibility rather hazy and often dropping to a few kilometres in rain.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
1.8mm2.2mm4.6mm
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

Low cloud with outbreaks of rain through the day and overnight. A significant wind chill on the tops.

Chance of cloud-free hill tops

Less than 10%.

Maximum wind speed expected

Southeast 20mph gusts 30mph.

Temperature

  • At 600m Plus 2C.
  • Valley Plus 6 or 7C.
  • Freezing level Above summits.

Low cloud and visibility

Extensive cloud and fog above 300 or 400m, down to lower slopes at first. Hazy conditions below the cloud base.

Mountain weather information

Tue 20 Jan

Sunrise:
Sunset:

Low cloud with outbreaks of rain at first then becoming drier and brighter for a period. Further rain likely to arrive in the evening. Strong southerly winds with a severe wind chill on the tops. Freezing level above summits.

Wed 21 Jan

Sunrise:
Sunset:

Outbreaks of rain, heavy at times with sleet on high summits. Severe gale force southerly winds with severe wind chill on the tops. Freezing level above summits.

Thu 22 Jan

Sunrise:
Sunset:

It is expected to remain unsettled and very windy with further periods of rain. Severe gale force southerly winds. Freezing level above summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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