Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High confidence for unsettled start, medium to low confidence for the detail from Wednesday.

Sunrise:
Sunset:

This evening forecast

Occasional showers with snow level 700m. Severe wind chill at height in fresh to strong summit winds.

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 Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Mountain weather forecast

Showers. Rather cloudy. Strong summit winds.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Sleet Heavy snow Light snow Heavy snow Sleet Sleet shower (day) Sleet shower (night) Sleet shower (night)
Chance of precipitation
(at 600m)
40% 40% 40% 70% 60% 40% 40% 40%

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
23
W
22
W
24
W
25
W
25
W
26
W
22
NW
18
300m W
13
W
12
W
14
W
15
W
15
W
17
W
12
W
9
Valley W
11
W
11
W
13
W
13
W
15
W
15
W
10
W
8
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 31 30 33 34 34 34 31 25
300m 29 27 29 30 30 32 26 20
Valley 28 27 28 29 31 32 24 19

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
Freezing Level
900m
800m
700m
700m
800m
900m
900m
800m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-4°
-5°
-6°
-6°
-4°
-4°
-4°
-4°
300m
-1°
-1°
Valley

Additional weather information

Meteorologist's view

Winds 10-15mph stronger than the speeds above across most exposed ridges and summits. Difficult conditions during the late morning at height in quite extensive hill fog, driving snow and a severe wind chill.

Weather

A rather cloudy day with showers with a snow level around 600-700m. Showers frequent and occasionally heavy for the late morning, before easing mid-afternoon as a few brighter spells develop.

Chance of cloud-free hill tops

30% becoming 60% late afternoon

Low cloud and visibility

Visibility becoming moderate or poor in rain showers, very poor in snow showers and within cloud with bases quite extensive from 500m at first, before lifting and breaking later in the day.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
13.6mm14.4mm22.4mm
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 with occasional brighter spells breaking through the veil of higher cloud. Moderate to fresh summit winds easing for the afternoon.

Chance of cloud-free hill tops

90% plus

Maximum wind speed expected

North or northwest beginning 15-20mph with gusts reaching 30mph across more exposed ridges and summits, gradually easing from late morning.

Temperature

  • At 600m Zero to Minus 1 Celsius
  • Valley Plus 1 Celsius increasing 7 Celsius during the afternoon
  • Freezing level 400-600m

Low cloud and visibility

Visibility very good or excellent.

Mountain weather information

Wed 18 Feb

Sunrise:
Sunset:

Cloudy with occasional snow and low level rain. East to southeast summit winds strong.

Thu 19 Feb

Sunrise:
Sunset:

Early patchy snow and rain, then dry with bright and sunny spells increasing for the afternoon. Freezing level lifting to around 600m. Fresh summit winds.

Fri 20 Feb

Sunrise:
Sunset:

Showers or longer periods of rain and initially summit snow. Strong summit winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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