Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence overall, but reducing to moderate for the location of highest rainfall totals on Saturday.
This evening forecast
Cloudy with a chance of rain and drizzle continuing overnight. Breezy at times, particularly on exposed summits and ridges.
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.
Mountain weather forecast
Cloudy with occasional outbreaks of rain and drizzle.
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 30% | 20% | 20% | 20% | 20% | 30% | 40% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
S
26
|
S
24
|
S
20
|
S
19
|
S
17
|
SW
17
|
SW
12
|
S
10
|
| 300m |
SW
13
|
SW
11
|
SW
8
|
SW
11
|
SW
11
|
SW
11
|
SW
7
|
SW
5
|
| Valley |
SW
11
|
SW
10
|
SW
8
|
SW
11
|
SW
10
|
SW
10
|
SW
6
|
S
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m | 34 | 31 | 26 | 25 | 23 | 23 | 15 | 13 |
| 300m | 27 | 23 | 18 | 21 | 19 | 20 | 13 | 11 |
| Valley | 25 | 22 | 18 | 21 | 19 | 20 | 14 | 11 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
13°
|
13°
|
12°
|
12°
|
14°
|
14°
|
13°
|
12°
|
| 300m |
15°
|
15°
|
14°
|
15°
|
17°
|
17°
|
16°
|
14°
|
| Valley |
16°
|
15°
|
15°
|
16°
|
18°
|
18°
|
16°
|
15°
|
| Freezing Level |
3,100m
|
3,500m
|
3,500m
|
3,500m
|
3,600m
|
3,600m
|
3,400m
|
3,200m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
9°
|
9°
|
9°
|
9°
|
11°
|
11°
|
12°
|
11°
|
| 300m |
13°
|
13°
|
13°
|
14°
|
15°
|
16°
|
15°
|
14°
|
| Valley |
14°
|
14°
|
14°
|
14°
|
16°
|
16°
|
16°
|
15°
|
Additional weather information
Meteorologist's view
Periods of poor visibility requiring good navigational skills. Waterproof's may be required in rain and drizzle, and caution to be taken on slopes as they may remain slippery for a time after rain.
Weather
Remaining widely cloudy with a chance of patchy rain and drizzle, and early morning mist of fog patches. Some bright or clearer spells possible to the lee of high ground. A band of rain and drizzle continues to spread eastwards overnight, bringing more prolonged outbreaks. Winds easing through the morning. Feeling mild and humid.
Chance of cloud-free hill tops
30%, increasing to 70% through the morning.
Low cloud and visibility
Cloud lowering to 500-600m, locally 300m on western slopes, with poor visibility in low cloud, mist and fog. Cloud bases gradually lifting above summits through the morning. Though prolonged rain or drizzle may reduce visibility, obscuring far reaching views.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 21.2mm | 40.2mm | 41.6mm |
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
A band of rain and drizzle continues to push eastwards across the region, bringing widespread cloud and heavy downpours at times. Turning showery later, with patchy cloud allowing some sunny spells to develop. Turning increasingly windy through the morning, with strong winds likely and possible summit gales.
Chance of cloud-free hill tops
30%, increasing to 60% from dawn.
Maximum wind speed expected
Southwesterly 30-35mph, with gusts 35-45mph.
Temperature
- At 600m Plus 10 Celsius.
- Valley Plus 15 Celsius, rising to 19 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud lowering to 700-800m, locally 500m on western slopes, with poor visibility in low cloud, mist and fog. Cloud bases gradually lifting through the morning. Though prolonged rain or drizzle may reduce visibility, obscuring far reaching views.
Mountain weather information
Sun 21 Sep
Sunrise:
Sunset:
Remaining unsettled on Sunday, with patchy cloud and scattered showers, which may be heavy at times. Moderate northwesterly winds easing and showers fading through the evening. Much cooler.
Mon 22 Sep
Sunrise:
Sunset:
Turning more settled, with patchy cloud allowing bright or sunny spells, though the odd shower may be possible at times. Moderate to fresh northerly winds.
Tue 23 Sep
Sunrise:
Sunset:
Staying largely fine and dry, with light to moderate northerly winds. The odd patch of mist or fog may develop under clear skies overnight, but clearing readily from dawn.
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.