Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

Very high for the change from changeable and showery weather to settled and dry weather from Friday and particularly through the weekend. Moderate regarding details of cloud and sunshine over the weekend and for the timing of any change back to less settled conditions next week.

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.
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.

Mountain weather forecast

Heavy showers possible at first but becoming largely dry with sunny intervals.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Heavy rain Fog Cloudy Sunny intervals Sunny intervals Partly cloudy (night)
Chance of precipitation
(at 600m)
60% 40% 20% 20% 10% <05%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m NW
21
NW
22
NW
21
NW
19
NW
18
NW
15
300m NW
11
NW
13
NW
14
NW
13
NW
11
NW
6
Valley NW
9
NW
13
NW
14
NW
14
NW
11
NW
7
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m 26 30 30 28 25 21
300m 22 26 28 25 21 15
Valley 20 27 28 27 22 17

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m
10°
10°
11°
300m
10°
11°
13°
14°
14°
10°
Valley
10°
12°
14°
14°
14°
11°
Freezing Level
1,700m
1,800m
2,000m
2,000m
1,900m
1,900m

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

Additional weather information

Meteorologist's view

A windy day with some buffeting on exposed ridges and summits. Wind speeds will be 5-10 mph higher than those in the table on the highest summits. A day for layers, including waterproofs. Brightening conditions in the afternoon may bring moderate UV levels, so consider sun protection. Rain and showers early on may also give a soaking.

Weather

Largely cloudy to start with heavy showers, these bringing a low risk of thunder. Showers tending to ease during the morning, with sunny spells developing during the afternoon. Windy.

Chance of cloud-free hill tops

30% becoming >95% during the morning.

Low cloud and visibility

Periods of cloud above 400-600m through the morning, this lifting above all summits during the morning. Generally good visibility, moderate to poor in showers and very poor visibility in low cloud.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
0.2mm14.8mm17.6mm
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

Generally dry with early low cloud soon clearing above hills to give sunny spells. Just a very low chance of a shower in the morning.

Chance of cloud-free hill tops

30% at first, becoming 95% during the morning.

Maximum wind speed expected

Northerly 20 mph gusting 30 mph.

Temperature

  • At 600m Plus 8 Celsius rising to plus 12 Celsius.
  • Valley Plus 7 Celsius rising to plus 18 Celsius.
  • Freezing level Well above the summits.

Low cloud and visibility

Periods of cloud above 500-600m at first. This lifting and clearing to leave all summits clear of cloud. Very good visibility with excellent air clarity.

Mountain weather information

Sat 1 Jun

Sunrise:
Sunset:

Dry and settled with periods of warm sunshine and some cloud at times. High UV levels in the strong sunshine with gentle to moderate northerly winds. Freezing level well above summits.

Sun 2 Jun

Sunrise:
Sunset:

Similar to on Saturday with a mixture of cloud and sunny spells. Very high UV levels in the strong sunshine and feeling warmer with gentle northerly winds. Freezing level well above summits.

Mon 3 Jun

Sunrise:
Sunset:

Another dry day with light northwesterly winds. Perhaps somewhat cloudier than over the weekend but sunny periods are still likely. High UV levels with a freezing level well above the summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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