Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for the generally fine and bright conditions on Thursday, with moderate confidence in the timing and detail of any rain on Thursday evening. Low confidence for of the unsettled conditions over the bank holiday weekend.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Mountain weather forecast
A fine day with sunny spells. Thickening cloud later with rain arriving after dark.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | <05% | <05% | <05% | 10% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
NW
12
|
NW
11
|
W
8
|
W
11
|
SW
13
|
SW
16
|
| 300m |
W
4
|
NW
6
|
W
6
|
W
8
|
SW
10
|
SW
9
|
| Valley |
W
4
|
NW
6
|
W
6
|
W
7
|
SW
8
|
SW
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 16 | 14 | 11 | 14 | 18 | 22 |
| 300m | 12 | 10 | 10 | 14 | 18 | 19 |
| Valley | 11 | 10 | 10 | 14 | 17 | 18 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
3°
|
5°
|
6°
|
4°
|
3°
|
| 300m |
3°
|
6°
|
9°
|
10°
|
7°
|
5°
|
| Valley |
3°
|
7°
|
10°
|
11°
|
8°
|
6°
|
| Freezing Level |
700m
|
800m
|
900m
|
1,000m
|
1,000m
|
800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-1°
|
2°
|
3°
|
0°
|
-3°
|
| 300m |
1°
|
4°
|
8°
|
8°
|
4°
|
2°
|
| Valley |
1°
|
6°
|
8°
|
9°
|
6°
|
4°
|
Additional weather information
Meteorologist's view
A lovely day for hill walking and hiking with bright skies and clear views to distant hills for most of the day. Feeling mild in the valleys with multiple layers still recommended for the summits, with wind chill expected and bringing feels like temperatures down as low as minus 3 Celsius.
Weather
A patchy frost in the valleys first thing but soon warming up to leave a fine day, with good spells of sunshine. Turning cloudier in the afternoon, with skies turning a little hazier later in the day. Rain spreading in before midnight, with low cloud and stronger winds moving in for the early hours.
Chance of cloud-free hill tops
80% or more.
Low cloud and visibility
Cloud above summits to start and through most of the day. Through the evening and towards midnight the low cloud may lower to 700-900m, and further to 400-600m in the early hours of Friday. Visibility will be generally excellent, with distant hills visible, becoming moderate in any rain during the evening, and poor to very poor in low cloud overnight.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.4mm | 1.4mm | 1.4mm |
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
Outbreaks of rain and low cloud likely through Friday. Persistent rain turning to showers through the afternoon with drier, clearer spells developing by evening and winds easing.
Chance of cloud-free hill tops
30% becoming 50% through the afternoon.
Maximum wind speed expected
West or southwesterly 30-35 mph, with gusts reaching 35-45 mph.
Temperature
- At 600m Plus 4 Celsius becoming plus 8 Celsius.
- Valley Plus 7 Celsius becoming plus 12 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Widespread low cloud expected at first, with bases 400-600m, though at times this may lower to 200-400m at times. With the lowest cloud likely to be in the south and west of the area. By the evening the cloud bases should increase to 700-900m and then above the summits. Within the rain visibility will be moderate to poor, becoming very poor within hill fog. By the evening visibility should improve to good.
Mountain weather information
Sat 4 Apr
Sunrise:
Sunset:
A damp day with periods of light rain and drizzle, this turning more showery later in the day. Moderate winds to start, increasing to a strong south-southwesterly winds with the potential for gales later.
Sun 5 Apr
Sunrise:
Sunset:
A colder and much brighter day with sunny spells and perhaps a few showers, potentially wintry on summits. Strong to gale force winds easing slowly through the day.
Mon 6 Apr
Sunrise:
Sunset:
Settled conditions returning for the day with plenty of sunshine and excellent visibilities, sunshine potentially turning hazy later. Moderate southerly winds, increasing to strong later.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.