Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for rain clearing on Tuesday and a dry day on Wednesday. Low for details from Thursday onwards.
This evening forecast
A wet evening with outbreaks of rain, potentially heavy and thundery at times, alongside widespread low cloud. Potentially briefly turning drier during the final hours of the day.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
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
Heavy outbreaks of rain clearing to sunny spells later.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
50% | 80% | 60% | 30% | 20% | 10% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
W
10
|
W
14
|
NW
15
|
NW
15
|
NW
16
|
NW
16
|
NW
12
|
W
8
|
| 300m |
W
7
|
W
9
|
W
9
|
NW
10
|
W
11
|
NW
12
|
W
8
|
W
5
|
| Valley |
W
6
|
W
9
|
W
9
|
NW
10
|
W
11
|
NW
12
|
W
8
|
W
5
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 15 | 19 | 20 | 22 | 23 | 24 | 17 | 13 |
| 300m | 14 | 17 | 18 | 20 | 22 | 23 | 16 | 12 |
| Valley | 14 | 18 | 20 | 21 | 22 | 23 | 16 | 13 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
11°
|
11°
|
11°
|
12°
|
13°
|
14°
|
14°
|
11°
|
| 300m |
12°
|
12°
|
12°
|
14°
|
16°
|
17°
|
16°
|
13°
|
| Valley |
13°
|
13°
|
13°
|
15°
|
17°
|
18°
|
17°
|
14°
|
| Freezing Level |
2,500m
|
2,500m
|
2,700m
|
2,700m
|
2,700m
|
2,600m
|
2,500m
|
2,500m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
8°
|
8°
|
8°
|
10°
|
10°
|
11°
|
12°
|
10°
|
| 300m |
11°
|
11°
|
11°
|
12°
|
14°
|
15°
|
15°
|
12°
|
| Valley |
12°
|
11°
|
11°
|
13°
|
15°
|
16°
|
16°
|
13°
|
Additional weather information
Meteorologist's view
Paths and slopes will be slippery following morning rainfall. But despite the cloudy start, UV levels will still be high during the afternoon's brighter and sunny spells.
Weather
Cloudy with areas of rain, heavy at times, moving across the park during the early hours of the morning. Rain should gradually clear to the east later on Tuesday morning. Becoming brighter with an increasing number of sunny spells during the afternoon and into the evening.
Chance of cloud-free hill tops
20% becoming 80%.
Low cloud and visibility
Widespread cloud above 400-600m at first, most persistent in the west. Becoming patchy above 700m by midday and lifting above summits by the end of the afternoon. Generally good visibility but occasionally moderate or poor in rain and very poor in low cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0.2mm | 10mm |
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
Early mist and fog patches clearing after dawn to leave a pleasant and dry day with a good number of sunny spells throughout. High UV levels.
Chance of cloud-free hill tops
70% in the early hours, rising to 90% or higher.
Maximum wind speed expected
10-15 mph southwesterly winds on the hills.
Temperature
- At 600m Plus 9 Celsius, rising to plus 14 Celsius.
- Valley Plus 12 Celsius, rising to plus 20 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Fog patches developing in the valleys first thing, then lifting through the morning and perhaps briefly covering hills for a time. Cloud remaining above the summits for the rest of the day with very good visibility.
Mountain weather information
Thu 18 Jul
Sunrise:
Sunset:
Cloudier than Wednesday, but some bright spells developing at times. The chance of a few scattered showers. Moderate southerly winds. Moderate UV levels.
Fri 19 Jul
Sunrise:
Sunset:
Some uncertainty, but rain perhaps moving through overnight with bright spells then developing by day. Moderate southwesterly winds. High UV levels.
Sat 20 Jul
Sunrise:
Sunset:
A dry start with rain possibly arriving during the day, heavy at times - but confidence is low at this stage. Moderate southwesterly winds.
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.