Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High overall but low on regional detail for showers.

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 Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
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

Often cloudy but turning brighter in the afternoon. Showers possible.

Time 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Fog Fog Cloudy Cloudy Cloudy Cloudy
Chance of precipitation
(at 600m)
60% 50% 50% 40% 50% 40%

Wind direction and speed (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m NE
9
E
8
NE
8
NE
8
NE
8
NE
8
300m NE
6
NE
7
E
6
NE
6
NE
5
NE
4
Valley NE
5
NE
6
E
5
E
4
NE
4
NE
3
Wind gust (mph)
Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m 12 11 11 10 11 13
300m 12 12 11 10 10 11
Valley 12 11 9 8 9 10

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
11°
11°
300m
10°
12°
14°
13°
11°
Valley
10°
11°
13°
15°
14°
11°
Freezing Level
1,900m
1,900m
1,900m
1,900m
1,900m
1,900m

Altitude above mean sea level
Time 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
11°
13°
13°
10°
Valley
10°
13°
14°
14°
11°

Additional weather information

Meteorologist's view

Wet ground still likely present which will make steeper slopes slippery underfoot.

Weather

Overnight low cloud and residual showery rain should lift and break during the morning, to leave a drier and brighter afternoon for much of the park. However, there is a small risk of a heavy shower developing, with a low chance of thunder.

Chance of cloud-free hill tops

20% during the early hours, rising to 60% during the morning and 90% for the afternoon.

Low cloud and visibility

Cloud bases of 300m during the early hours, occasionally down to 200m. Lifting to 500m through the morning, but then should be above the summits in the afternoon. Poor to very poor visibility in the hill fog, but conditions improving into the afternoon with generally good visibility likely.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
19.6mm29.4mm30.2mm
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

Mostly dry with bright or sunny spells and just the chance of an isolated shower.

Chance of cloud-free hill tops

90%

Maximum wind speed expected

Northerly 15-20 mph

Temperature

  • At 600m Plus 5 Celsius, rising to plus 9 Celsius.
  • Valley Plus 6 Celsius, rising to plus 15 Celsius.
  • Freezing level Above summits

Low cloud and visibility

Cloud generally above summits, with generally good to very good visibility.

Mountain weather information

Wed 6 May

Sunrise:
Sunset:

Bright or sunny spells and scattered showers. Feeling cooler, with a moderate northerly wind.

Thu 7 May

Sunrise:
Sunset:

Bright or sunny spells and scattered showers. Winds light to moderate southerly.

Fri 8 May

Sunrise:
Sunset:

Bright or sunny spells and isolated showers. Light to moderate southeasterly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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