Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High confidence in overall more changeable theme. Lower confidence regarding detail in timing, duration, and intensity of showers and associated thunderstorm risk over the weekend.

Sunrise:
Sunset:

This evening forecast

Dry evening with cloud building into the night.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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

Largely dry with the odd heavy shower.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Partly cloudy (night) Heavy shower (night) Heavy shower (night) Sunny intervals Light shower (day) Light shower (day) Partly cloudy (night) Cloudy
Chance of precipitation
(at 600m)
<05% 60% 60% 30% 60% 60% 30% 20%

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 W
4
N
4
N
4
SW
5
SW
7
SW
10
SW
9
S
12
300m W
2
W
2
NW
2
W
3
SW
5
SW
8
SW
5
SE
5
Valley W
3
W
2
NW
2
W
3
SW
5
SW
7
SW
4
SE
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 5 5 5 7 11 15 13 17
300m 6 4 3 6 9 14 11 12
Valley 6 4 3 6 9 14 9 9

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
13°
13°
12°
14°
16°
17°
16°
14°
300m
14°
14°
14°
17°
19°
20°
18°
16°
Valley
15°
14°
15°
18°
20°
21°
18°
16°
Freezing Level
2,700m
3,000m
2,900m
2,900m
2,700m
2,600m
2,800m
2,800m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
12°
12°
12°
14°
15°
15°
14°
12°
300m
14°
14°
14°
17°
19°
19°
18°
15°
Valley
15°
15°
15°
18°
20°
20°
19°
16°

Additional weather information

Meteorologist's view

Waterproof advised with possible sudden downpours causing poor visibilities. Strong sunshine with high UV levels.

Weather

Largely cloudy to start with heavy, possibly thundery showers pushing northwards. Cloud breaking to leave sunnier spells but also the continued risk of showers. Showers easing during the evening ahead of further cloud and rain by midnight.

Chance of cloud-free hill tops

60% in the west with low cloud, then 80%

Low cloud and visibility

Cloud bases will be mainly above the summits, however there may be sudden drops to 400-600m through the afternoon if showers or thunderstorms develop in the area. Generally very good visibility, though deteriorations expected in heavy showers.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
4.6mm7.2mm20.2mm
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

Unsettled with widespread showers which may turn heavy and thundery through the course of the day, with hail showers also a risk. Warm and humid in the valley, though breezier than recent days.

Chance of cloud-free hill tops

30% during the morning, rising to 70%.

Maximum wind speed expected

Southerly 15-20 mph gusting 30mph.

Temperature

  • At 600m Plus 12 Celsius rising to plus 16 Celsius.
  • Valley Plus 16 Celsius rising to plus 21 Celsius.
  • Freezing level Above summits.

Low cloud and visibility

Low cloud down to 400 m at first, then cloud bases mainly above the summits by mid-morning, however there may be sudden drops to 400-600m through the afternoon around heavy downpours. Generally very good visibility, though deteriorations expected in heavy showers.

Mountain weather information

Mon 21 Jul

Sunrise:
Sunset:

Brighter and drier conditions expected though the odd heavy shower still possible. Moderate northwesterly winds.

Tue 22 Jul

Sunrise:
Sunset:

Drier than recent days with sunny spells developing through the afternoon. Winds easing to moderate westerlies.

Wed 23 Jul

Sunrise:
Sunset:

Similar with a few showers or longer spells of rain. Moderate northwesterly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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