Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a gradual transition to dry and settled weather. Moderate for cloud amounts over the weekend and shower detail into Monday.
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
Cold and sunny at first, then gradually clouding over.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | 00% | 10% | 20% | 30% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
NE
3
|
W
6
|
W
12
|
W
18
|
W
17
|
W
20
|
| 300m |
SW
2
|
W
4
|
W
9
|
W
13
|
W
12
|
W
14
|
| Valley |
W
3
|
W
4
|
W
8
|
W
12
|
W
11
|
W
12
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m | 5 | 9 | 17 | 26 | 24 | 30 |
| 300m | 3 | 7 | 17 | 25 | 24 | 27 |
| Valley | 4 | 8 | 16 | 24 | 24 | 26 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
1°
|
4°
|
6°
|
6°
|
5°
|
5°
|
| 300m |
1°
|
7°
|
10°
|
9°
|
8°
|
7°
|
| Valley |
1°
|
7°
|
10°
|
9°
|
9°
|
8°
|
| Freezing Level |
600m
|
700m
|
1,000m
|
1,200m
|
1,500m
|
1,500m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
-1°
|
1°
|
3°
|
1°
|
1°
|
0°
|
| 300m |
0°
|
6°
|
8°
|
6°
|
5°
|
4°
|
| Valley |
0°
|
6°
|
9°
|
6°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
Despite lighter winds than of late, it will still feel cold for the middle of April. Winds will strengthen later, gusting up to 35 mph over the highest summits by sunset, making it feel like it is below freezing.
Weather
A sunny but frosty start to the morning although high cloud gradually turning the sunshine more hazy. Thickening cloud during the afternoon and evening with a chance of a few spots of rain. Winds freshening later in the day.
Chance of cloud-free hill tops
90%, 40% by sunset.
Low cloud and visibility
Cloud free summits with very good visibility. Periods of cloud developing above 500-600m by sunset bringing some poor or very poor visibilities by the end of the day over the summits.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1mm | 1.4mm | 13.4mm |
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.
Mountain weather information
Weather
Mostly cloudy to begin the day with some patchy hill fog and showers in places. Cloud amounts reducing with sunny intervals soon developing and becoming mainly dry from late morning onwards. A fine end to the day with lengthy sunny periods.
Chance of cloud-free hill tops
60% becoming 90%.
Maximum wind speed expected
Northwesterly 25 mph gusting 35 mph, easing later.
Temperature
- At 600m Plus 4 Celsius rising to Plus 5 Celsius.
- Valley Plus 8 Celsius rising to Plus 12 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Periods of cloud above 500m until mid-morning, then patchy cloud above 800m until early afternoon but all summits free of cloud by the evening. Excellent visibility below the cloud with superb air clarity. Locally very poor in the cloud.
Mountain weather information
Sat 20 Apr
Sunrise:
Sunset:
Some cloud during the morning but otherwise a generally fine day with increasing amounts of sunshine. High UV levels during the middle of the day on the summits. Light northeasterly winds with a freezing level above summits.
Sun 21 Apr
Sunrise:
Sunset:
Probably cloudier than on Saturday but still the chance of some sunny intervals. Light northeasterly winds with a freezing level above summits.
Mon 22 Apr
Sunrise:
Sunset:
Areas of low cloud first thing, then brighter with sunny intervals developing. The low chance of a few showers. Freezing level above summits with a light to moderate northeasterly breeze.
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.