Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

Generally high confidence for Monday, although low for timings of rain. High for low cloud and strong winds Tuesday, but low for rain amounts. Generally lower confidence from Wednesday with large uncertainty in position of fronts.

Sunrise:
Sunset:

This evening forecast

Heavy rain gradually clearing eastward through the evening and start of the night although low cloud likely to linger. Southerly winds 25 gusting 30 mph across the tops, perhaps easing late evening.

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 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

Rain in the morning, heavy showers and a risk of lightning in the afternoon.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Fog Mist Mist Heavy rain Heavy rain Heavy shower (day) Heavy shower (day) Light shower (night)
Chance of precipitation
(at 600m)
20% 10% 10% 70% 70% 40% 40% 30%

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 S
18
S
22
S
15
S
15
S
14
W
15
SW
15
SW
14
300m SW
9
SW
10
SW
7
S
6
S
8
W
10
SW
8
SW
9
Valley SW
7
SW
6
SW
6
SE
4
S
7
W
8
SW
6
SW
7
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 25 30 21 21 19 21 21 20
300m 19 22 16 15 16 19 18 19
Valley 18 18 16 11 16 18 15 17

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
11°
10°
10°
11°
Freezing Level
1,800m
1,600m
1,500m
1,700m
1,600m
1,500m
1,400m
1,400m

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

Additional weather information

Meteorologist's view

Some uncertainty in timing of rain and its clearance. Stronger gusts likely near heavy afternoon showers.

Weather

Some low cloud and a chance of patchy rain in the early hours, but mainly dry. Outbreaks of rain spread north in the morning, heavy for a time, before clearing to brighter spells and scattered heavy showers from around midday with a risk of lightning. Showers continue through the evening although becoming more isolated.

Chance of cloud-free hill tops

Nil in the morning, 60% in the afternoon.

Low cloud and visibility

Very poor visibility in the morning in rain and cloud, bases down to 300m. Visibility occasionally good in the afternoon as cloud bases lift to around 600m with increasing cloud breaks, but temporary reductions in visibility in passing showers.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
1.2mm2.8mm7mm
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

Low cloud and a few showers through the early hours, with outbreaks of rain arriving by dawn, quickly turning heavy with gales developing over the tops. Heavy rain is likely to ease through the morning, but drizzle, low cloud and gales persisting, with a chance of some heavier outbreaks of rain. Further persistent heavy rain in the evening.

Chance of cloud-free hill tops

Nil

Maximum wind speed expected

South 30-35 gusting 45-50 mph.

Temperature

  • At 600m Plus 6 Celsius rising to 10 Celsius.
  • Valley Plus 8 Celsius rising to 11 Celsius.
  • Freezing level Above the summits.

Low cloud and visibility

Very poor visibility throughout the day in rain, drizzle and persistent extensive cloud, bases down to 400m, often lower slopes on southerly aspects.

Mountain weather information

Wed 12 Nov

Sunrise:
Sunset:

Further outbreaks of rain, likely to be persistent for several hours, but lighter winds. Rain is likely to clear north later in the day with a few showers remaining.

Thu 13 Nov

Sunrise:
Sunset:

A lot of uncertainty in the position of rain bands. Currently looks most likely to be largely dry with bright spells, a few showers and light winds. However a chance of persistent rain.

Fri 14 Nov

Sunrise:
Sunset:

Continuing large uncertainty around position of rain bands, although currently looking likely to be persistent rain and strong easterly winds for much of the day.

Updated at:

Summit specific forecast

Mountain summit forecast map

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