Mountain weather

Bannau Brycheiniog / Brecon Beacons

Yellow warning

Yellow weather warning in force for Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High confidence for Storm Amy to bring very windy conditions through later Friday and Saturday but some uncertainty in timings of rain. High for unsettled and often wet conditions next week.

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 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.

hazard Storm Force Winds
Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.

Mountain weather forecast

A dry start then becoming wet and very windy.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Cloudy Heavy rain Heavy rain Heavy rain Heavy rain
Chance of precipitation
(at 600m)
20% 20% 70% >95% >95% 80%

Wind direction and speed (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m SW
17
SW
18
S
28
SW
35
SW
38
SW
36
300m SW
8
SW
9
SW
15
SW
21
SW
23
SW
22
Valley SW
5
SW
8
SW
11
SW
17
SW
19
SW
19
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m 21 22 36 46 50 48
300m 19 19 30 43 47 44
Valley 17 18 26 38 43 43

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
12°
12°
12°
12°
13°
13°
300m
13°
14°
15°
14°
15°
15°
Valley
14°
15°
16°
15°
16°
15°
Freezing Level
2,300m
2,600m
3,400m
3,700m
3,800m
4,000m

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
12°
13°
12°
11°
11°
11°
Valley
13°
14°
14°
12°
13°
12°

Additional weather information

Meteorologist's view

Conditions will deteriorate quickly during the afternoon. Walking will become arduous with a high risk of being blown over from gusts of 60 to 70mph on high ridges and summits above 600m from late afternoon onwards.

Weather

A dry start with a little brightness. Cloud and rain will quickly spread east from mid-morning, turning heavy and persistent in the afternoon with drenching conditions later in the day. Becoming very windy with a low risk of storm force winds developing on high ridges and summits during the evening.

Chance of cloud-free hill tops

40% becoming 10% from late morning.

Low cloud and visibility

Occasional cloud above 400-600m in the morning becoming extensive above 300-400m in afternoon. Visibility occasionally good at first, but poor in rain and very poor in low cloud covering the hills.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
7mm7.2mm7.2mm
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

Rain clearing overnight then bright or clear spells and showers, some heavy. Remaining very windy with sudden strong gusts making walking very difficult with high risk of being blown over. Feeling cold on the tops.

Chance of cloud-free hill tops

70%.

Maximum wind speed expected

Westerly 35-45mph with gusts 60 to 70 mph.

Temperature

  • At 600m Plus 7 or 8C.
  • Valley Plus 5C becoming plus 13C.
  • Freezing level Above summits.

Low cloud and visibility

Occasional cloud above 600m giving very poor visibility, poor at times in showers. Occasionally good between showers.

Mountain weather information

Sun 5 Oct

Sunrise:
Sunset:

Cloudy with outbreaks of mostly light rain or drizzle and strong westerly winds. Risk of gales on high slopes. Freezing level above summits.

Mon 6 Oct

Sunrise:
Sunset:

Cloudy with outbreaks of rain and strong westerly winds. Risk of gales on high slopes. Freezing level above summits.

Tue 7 Oct

Sunrise:
Sunset:

Further spells of rain are likely. Winds may ease.

Updated at:

Summit specific forecast

Mountain summit forecast map

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