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 for high pressure maintaining relatively settled conditions but low for the cloud detail.

Sunrise:
Sunset:

This evening forecast

Rather cloudy but most staying dry. Moderate easterly summit breezes.

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 Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Mountain weather forecast

Rather cloudy, particularly in east. Mainly dry. Moderate breezes.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Cloudy Fog Cloudy Cloudy Sunny intervals Partly cloudy (night) Cloudy
Chance of precipitation
(at 600m)
<05% <05% <05% 00% 00% 00% <05% <05%

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 E
10
E
10
NE
10
NE
11
NE
11
NE
10
E
9
E
9
300m NE
5
E
4
NE
5
NE
7
NE
9
NE
8
E
5
E
4
Valley E
4
E
3
NE
4
E
6
E
8
NE
7
E
5
E
4
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 15 15 14 15 16 14 14 15
300m 12 11 11 13 15 14 12 10
Valley 11 10 11 12 14 14 13 11

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°
11°
Valley
10°
10°
11°
12°
Freezing Level
2,300m
2,400m
2,300m
2,400m
2,400m
2,400m
2,400m
2,400m

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
10°
10°

Additional weather information

Meteorologist's view

Navigation difficult at times in quite extensive hill fog.

Weather

Quite a lot of low cloud shrouding eastern hills, particularly early and late in the day. Best of brighter spells appearing during the afternoon and in the west, but also prolonged sunshine above the inversion which will be around 700m. Most staying dry but the chance of a few outbreaks of light rain, drizzle, mist and fog appearing.

Chance of cloud-free hill tops

80% above 700m, below this level 50% in west, 25% in east, due to inversion but low confidence in this detail

Low cloud and visibility

Occasional or quite extensive low cloud below around 700m, particularly in the east both early and late in the day, but none above the inversion and tending to break below at times, chiefly during the afternoon and in the west. Visibility becoming moderate or poor in mist and rain, very poor in fog and within cloud.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
0mm0.2mm0.2mm
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

Similar expectations to Wednesday with low cloud quite extensive in the east, but more broken in the west, with some limited drizzle and a risk of valley mist and fog. Sunshine extensive above the inversion, occasionally penetrating below, particularly for the afternoon and in the west, but detail remains elusive.

Chance of cloud-free hill tops

80% above 700m, below this level 50% in west, 25% in east, due to inversion but low confidence in this detail

Maximum wind speed expected

East less than 15mph

Temperature

  • At 600m Plus 5 rising to 8 Celsius
  • Valley Plus 7 rising to 16 Celsius
  • Freezing level Above summits

Low cloud and visibility

Occasional or quite extensive low cloud below around 700m, particularly in the east both early and late in the day, but none above the inversion and tending to break below at times, chiefly during the afternoon and in the west. Visibility becoming moderate or poor in mist and rain, very poor in fog and within cloud.

Mountain weather information

Sat 18 Oct

Sunrise:
Sunset:

Mostly dry, quite a lot of low cloud tending to thin for the afternoon. Moderate easterly summit winds. Freezing level above all peaks.

Sun 19 Oct

Sunrise:
Sunset:

Mostly dry, quite a lot of low cloud tending to thin for the afternoon. Moderate to fresh southeast summit winds. Freezing level above all peaks.

Mon 20 Oct

Sunrise:
Sunset:

Dry, rather cloudy start. Cloud thickening later in the day to bring periods of rain, as southeast summit winds freshen. Freezing level above all peaks.

Updated at:

Summit specific forecast

Mountain summit forecast map

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