Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for wet and windy weather on Sunday becoming lower for cloud and rain details on Monday. High for more settled conditions on Tuesday as high pressure builds but some uncertainty in how long it will last.

Sunrise:
Sunset:

This evening forecast

Dry at first then outbreaks of rain, with brief snow above 600m, will soon spread eastwards. Southerly winds becoming strong on the tops through the evening. Freezing level 800m, then rising 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 Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

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 Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Mountain weather forecast

Cloudy with spells of rain or drizzle. Strong southerly winds with gales on the tops.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Heavy rain Cloudy Fog Heavy rain Heavy rain Cloudy Cloudy Cloudy
Chance of precipitation
(at 600m)
80% 40% 60% >95% 70% 60% 60% 40%

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 S
22
S
22
S
24
SW
23
SW
28
SW
27
S
27
S
28
300m SW
12
SW
11
S
12
SW
13
SW
18
SW
16
S
16
S
15
Valley S
9
SW
7
S
9
SW
11
SW
15
SW
12
S
13
S
12
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 30 30 32 30 39 37 38 39
300m 25 25 27 28 35 33 33 31
Valley 22 21 23 26 33 28 30 28

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
10°
Valley
10°
10°
10°
Freezing Level
1,200m
1,200m
1,500m
1,800m
1,700m
1,700m
1,600m
1,500m

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°
300m
Valley

Additional weather information

Meteorologist's view

Southerly gales bringing arduous and tiring conditions on higher slopes and ridges above 600m with a risk of being blown over. Drenching conditions in the rain in the morning and feeling rather cold on the tops, despite the milder temperatures.

Weather

Showery rain overnight then Sunday will be cloudy with rain becoming persistent and turning heavy at times. Rain or drizzle turning lighter and more sporadic through the afternoon then dying out in the evening.

Chance of cloud-free hill tops

Less than 10%, becoming 60% during afternoon.

Low cloud and visibility

Poor visibility at height for much of the period with extensive low cloud developing in the morning, bases 300 to 500m. Cloud lifting on to higher slopes through the afternoon with visibility generally improving.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
4.4mm25.2mm32.4mm
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

Mainly dry overnight and to start the day. Thicker cloud and outbreaks of rain spreading eastwards, most likely in the afternoon but some uncertainty in the timings. The rain will then die out during the evening. Strong winds easing.

Chance of cloud-free hill tops

60% overnight and morning, becoming 20% as rain arrives.

Maximum wind speed expected

South 25 to 35mph gusts 50mph at first, easing to 10 to 15mph.

Temperature

  • At 600m Plus 5C, rising to 9C for a time.
  • Valley Plus 8C rising to 11 to 13C, falling to 5C in evening.
  • Freezing level Above summits.

Low cloud and visibility

Mainly good visibility at first, becoming poor when rain arrives with extensive cloud developing, bases 500 to 700m. Cloud slowly lifting and breaking up through the evening.

Mountain weather information

Tue 3 Mar

Sunrise:
Sunset:

A frost overnight then dry with sunny spells for most of the day. Perhaps some patchy rain and summit snow later. Light winds at first then a freshening easterly developing. Feeling cold. Freezing level just above summits.

Wed 4 Mar

Sunrise:
Sunset:

Mainly dry with sunny spells but cloudier with a little rain at first. Fresh southeast winds on the tops. Freezing level above summits.

Thu 5 Mar

Sunrise:
Sunset:

It is likely to turn more unsettled with outbreaks of rain spreading east. Southerly gales on the tops. Freezing level above summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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