Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for a generally dry day on Sunday and for the general evolution but moderate for details of rain/showers on Monday and Tuesday and the strength of winds later on Wednesday.

Sunrise:
Sunset:

This evening forecast

Largely cloudy this evening with a small chance of a shower.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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.

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.

Mountain weather forecast

A sunny start with any fog soon clearing, then cloudier for the afternoon.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Partly cloudy (night) Partly cloudy (night) Sunny day Sunny intervals Sunny intervals Cloudy Sunny intervals Sunny day
Chance of precipitation
(at 600m)
10% 10% <05% <05% 20% 30% 10% <05%

Wind direction and speed (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m W
4
NW
3
NW
4
W
4
W
7
W
7
W
8
SW
5
300m W
4
W
3
W
2
W
3
W
6
W
5
W
7
SW
3
Valley W
4
W
4
NW
3
W
3
W
6
W
6
W
6
W
3
Wind gust (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 6 5 7 7 11 11 12 6
300m 8 5 4 6 11 10 13 5
Valley 8 6 5 7 11 12 12 5

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
12°
14°
14°
14°
10°
300m
10°
10°
14°
17°
17°
16°
11°
Valley
10°
10°
15°
18°
18°
16°
13°
Freezing Level
2,200m
2,200m
2,200m
2,200m
2,300m
2,300m
2,300m
2,200m

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
11°
13°
14°
12°
300m
10°
14°
16°
17°
15°
11°
Valley
10°
10°
15°
17°
17°
16°
12°

Additional weather information

Meteorologist's view

Despite not feeling particularly hot, UV levels will often be high so sun protection is advised, even during cloudier periods.

Weather

Any shallow mist and fog in the valleys will soon clear to leave plenty of sunshine to begin the morning. Cloud soon bubbling up though to leave a much cloudier afternoon, although still with some sunny intervals. The outside chance of a rogue shower developing but generally remaining dry. Cloud amounts reducing later to leave a mainly sunny evening.

Chance of cloud-free hill tops

95%.

Low cloud and visibility

Early morning mist may lift to give some scraps of cloud around 300-500m until mid-morning. Otherwise, any cloud that forms should generally remain above the summits. Generally very good visibility but distant hills clear to see, but locally poor or very poor in early morning fog and/or cloud.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
0.2mm10mm10.4mm
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

Dry during the early hours with clear spells but turning cloudy soon after dawn with an increasing chance of showers later in the morning. The chance of a longer spell of heavy rain for a few hours during the middle of the day, perhaps briefly thundery but this caries low confidence. Turning brighter later in the day with sunny spells and a chance of further heavy showers or thunderstorms.

Chance of cloud-free hill tops

80% falling to 30% by early afternoon.

Maximum wind speed expected

Southerly or southeasterly 20-25 mph. Sudden gusts possible in thunderstorms.

Temperature

  • At 600m Plus 10 Celsius rising to plus 13 Celsius.
  • Valley Plus 8 Celsius rising to plus 19 Celsius.
  • Freezing level Well above the summits.

Low cloud and visibility

Periods of cloud around 500m during spells of rain or showers. Patches forming down to 400m during heavier showers and thunderstorms. Generally good visibility but becoming widely moderate for a time during the rain and poor during thunderstorms and in cloud.

Mountain weather information

Tue 16 Jul

Sunrise:
Sunset:

Largely dry at first but scattered showers are likely to develop once again. These could be heavy with a chance of thunder. Light to moderate westerly winds with high UV levels.

Wed 17 Jul

Sunrise:
Sunset:

Mostly dry and bright to begin with but turning cloudier with a chance of rain later. Moderate southwesterly winds strengthening later.

Thu 18 Jul

Sunrise:
Sunset:

Overnight rain then a mainly dry day with a mixture of cloud and sunny spells. Moderate to fresh westerly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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