Mountain weather

Mountain weather

Bannau Brycheiniog / Brecon Beacons

Confidence

High confidence for a cooler theme.

Mountain hazards

Mountain weather hazards

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

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.

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

Hill fog clearing then sunny spells.

Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
Weather
(at 800m)
Weather symbols Fog Cloudy Cloudy Sunny intervals Sunny intervals Partly cloudy (night)
Chance of
precipitation
(at 800m)
Chance of precipitation
10%
10%
10%
10%
10%
10%

Wind direction and speed

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
600m
600m NE 19mph knots
NE
19mph
NE 20mph knots
NE
20mph
NE 18mph knots
NE
18mph
NE 15mph knots
NE
15mph
NE 14mph knots
NE
14mph
NE 10mph knots
NE
10mph
300m
300m NE 12mph knots
NE
12mph
NE 14mph knots
NE
14mph
NE 12mph knots
NE
12mph
NE 10mph knots
NE
10mph
NE 8mph knots
NE
8mph
N 6mph knots
N
6mph
Valley
Valley NE 10mph knots
NE
10mph
NE 12mph knots
NE
12mph
NE 11mph knots
NE
11mph
NE 10mph knots
NE
10mph
NE 8mph knots
NE
8mph
N 5mph knots
N
5mph

Wind gust

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
600m
600m 27mph 27mph 25mph 21mph 19mph 16mph
300m
300m 23mph 24mph 22mph 19mph 17mph 16mph
Valley
Valley 21mph 23mph 22mph 19mph 17mph 16mph

Altitude above mean sea level
Time
Time
06:00
09:00
12:00
15:00
18:00
21:00
600m
600m -1 degrees Celsius -1 degrees Celsius 2 degrees Celsius 4 degrees Celsius 5 degrees Celsius 3 degrees Celsius
300m
300m 3 degrees Celsius 4 degrees Celsius 8 degrees Celsius 9 degrees Celsius 9 degrees Celsius 5 degrees Celsius
Valley
Valley 5 degrees Celsius 6 degrees Celsius 9 degrees Celsius 11 degrees Celsius 10 degrees Celsius 6 degrees Celsius
Freezing Level Freezing Level
1800m
1600m
1300m
1300m
1200m
1100m

Additional weather information

Meteorologist's view

Poor conditions to start, requiring good navigational skills. Otherwise, UV levels moderate to high with sun protection advised. Feeling cooler though with brisk northeasterly winds.

Weather

Low cloud and hill fog first thing. This lifting then a bright day with sunny intervals later. Clear skies into the night with temperatures quickly falling away. Feeling cooler than of late.

Chance of cloud-free hill tops

40% rising to 90%.

Low cloud and visibility

Fairly extensive low cloud down to 500-600m, especially to the east. This lifting and breaking by the afternoon. Very poor visibility to start then improving to very good.

Ground conditions

No recent ground conditions report available.

Summit specific forecast