Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for unsettled, often wintry conditions throughout the forecast period, but lower for timings of arrival and clearance of more persistent bands of rain and snow.

Sunrise:
Sunset:

This evening forecast

A few early clear spells but cloud soon increasing with patchy rain and drizzle developing, especially over western hills. Strengthening southwesterly winds, gusts around 60mph over ridges and summits by midnight.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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 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.
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

Heavy rain spreading south, turning to snow later. Very windy

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Cloudy Cloudy Light rain Light rain Light rain Light rain Heavy rain
Chance of precipitation
(at 600m)
10% 20% 40% 50% 90% 90% 90% >95%

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 SW
26
SW
30
SW
34
SW
32
SW
38
SW
39
SW
38
SW
31
300m SW
15
SW
16
SW
20
SW
21
SW
23
SW
25
SW
24
W
19
Valley SW
11
SW
13
SW
16
SW
17
SW
18
SW
21
SW
21
W
17
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 35 40 46 43 50 52 51 43
300m 30 35 41 42 46 48 48 37
Valley 28 32 36 39 42 45 44 36

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°
10°
10°
Valley
10°
10°
10°
Freezing Level
1,100m
1,200m
1,300m
1,800m
2,100m
1,900m
1,900m
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°
-2°
-2°
300m
Valley

Additional weather information

Meteorologist's view

Increasing winds, gusts around 60mph over higher summits and ridges towards midday, making, along with very poor visibility, progress difficult. Warm waterproof clothing essential.

Weather

Cloudy with patchy rain, drizzle, especially for western hills, overnight. Then a cloudy morning with outbreaks of rain becoming more persistent through the morning. The rain turns heavier through the afternoon. During the late evening the rain turns increasingly to snow above about 600m.

Chance of cloud-free hill tops

Around 25% in west, around 40% in east falling to near zero from midday.

Low cloud and visibility

Periods or persistent cloud above about 600-750m, but more occasional at times above 750-900m in the east, lowering to 450-600m, with patches below, in the afternoon. Away from cloud, visibility good falling to several kilometres in rain and drizzle and a kilometre or less in snow during the evening.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
11mm11.2mm14.2mm
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

Clear or sunny spells and wintry showers falling mainly as snow above 450m.

Chance of cloud-free hill tops

Around 75%.

Maximum wind speed expected

Westerly or southwesterly 25-30mph, gusts around 50mph over ridges and summits, easing in evening.

Temperature

  • At 600m Around Plus 3 Celsius falling to zero
  • Valley Around plus 3 or 4 Celsius at dawn rising to plus 7 or 8 Celsius by day
  • Freezing level Around 800m falling to 600m.

Low cloud and visibility

Occasional cloud above 750m, lowering to 600m at times in showers. Away from cloud, visibility very good falling to several kilometres in rain showers and a kilometre or so in snow showers.

Mountain weather information

Sat 14 Mar

Sunrise:
Sunset:

Mainly dry with clear or sunny spells. Cloud increasing through the evening. Fresh westerly winds backing southwesterly and easing. Freezing level around 750m.

Sun 15 Mar

Sunrise:
Sunset:

Cloudy with rain clearing to sunny spells and blustery wintry showers in afternoon. Strengthening westerly winds. Freezing level rising above summits, falling to 600m later.

Mon 16 Mar

Sunrise:
Sunset:

Early wintry showers dying out with sunny spells developing but cloud and rain spreading east in afternoon. Strong westerly winds. Freezing level 600m, rising later.

Updated at:

Summit specific forecast

Mountain summit forecast map

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