Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for a lot of fine weather next few days. Some uncertainty about cloud amounts, though some very warm sunshine possible Tuesday and Wednesday. Moderate confidence for the timing of a rain band clearing through early on Thursday, introducing cooler more changeable conditions later in the week.
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.
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.
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
Early patchy frost. Becoming sunny. Breezy.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | <05% | 00% | 00% | 00% | 00% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
S
16
|
S
21
|
S
22
|
S
23
|
SE
19
|
SE
19
|
| 300m |
SE
3
|
SE
8
|
S
11
|
S
11
|
SE
9
|
SE
8
|
| Valley |
NE
2
|
SE
7
|
S
10
|
S
9
|
NE
4
|
SE
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 23 | 27 | 28 | 29 | 29 | 31 |
| 300m | 15 | 17 | 21 | 22 | 21 | 21 |
| Valley | 5 | 15 | 20 | 20 | 9 | 11 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
4°
|
7°
|
9°
|
8°
|
7°
|
| 300m |
1°
|
8°
|
11°
|
13°
|
11°
|
8°
|
| Valley |
1°
|
8°
|
12°
|
14°
|
11°
|
7°
|
| Freezing Level |
800m
|
900m
|
1,300m
|
1,600m
|
1,600m
|
2,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-2°
|
2°
|
5°
|
4°
|
3°
|
| 300m |
0°
|
5°
|
9°
|
10°
|
9°
|
6°
|
| Valley |
0°
|
7°
|
10°
|
12°
|
10°
|
6°
|
Additional weather information
Meteorologist's view
Any early mist/fog patches may give difficult conditions for navigating. It will be cold and often breezy near the hill tops too, so warm clothing is advised.
Weather
Dry. A cold start with a patchy frost. Areas of cloud during the morning, with a chance of the odd mist or fog patch first thing. Skies clearing heading into the afternoon and for the evening, giving increasingly sunny/clear conditions. Breezy at times, especially on the hill tops.
Chance of cloud-free hill tops
90% or more.
Low cloud and visibility
Poor visibility at first should any mist/fog patches develop briefly, otherwise good to very good visibility, becoming excellent at times.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.8mm | 6.2mm | 12.6mm |
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.
Mountain weather information
Weather
Dry and sunny, though a bit chilly at first. Cloud gradually increasing during the day, though much of it medium or high level cloud, so sunshine just turning hazy. Breezy in the morning, and fairly windy near the hill tops, though southeasterly winds gradually easing later. Becoming very warm in the sunshine.
Chance of cloud-free hill tops
100%.
Maximum wind speed expected
Southeasterly 25 to 30mph with gusts 35 to 40mph, slowly easing later.
Temperature
- At 600m PS04C rising to PS15C.
- Valley PS06C rising to PS20C.
- Freezing level Above the summits throughout.
Low cloud and visibility
Low cloud not expected, with visibility mostly very good.
Mountain weather information
Wed 8 Apr
Sunrise:
Sunset:
Mostly dry. Bright or sunny spells, and becoming warm again when the sun appears. Cloud slowly thickening later, with some fog developing on hill tops and rain arriving overnight reducing visibility. Light to moderate winds, freshening later. Freezing levels above summits throughout.
Thu 9 Apr
Sunrise:
Sunset:
Early rain clearing to a colder, brighter but rather windy day with sunshine and showers. Freezing levels lowering to around 700 metres, with some of the showers turning wintry near the hill tops.
Fri 10 Apr
Sunrise:
Sunset:
Mainly dry with some bright spells, though becoming cloudier later with a chance of rain. Southwest winds strengthening, becoming windy across summits later. Freezing levels climbing back above the hill tops.
Updated at:
Summit specific forecast
Mountain summit forecast map
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Key
Mountain summits
Other points of interest
Cluster of multiple stations
The Bannau Brycheiniog / Brecon Beacons is a mountain range in South Wales comprising six main peaks, with the highest peak, Pen y Fan, standing at 886 metres.