Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall confidence for the overnight conditions, however, some uncertainties for the extend of showers for Thursday and Friday. Low confidence for timing and extent of showers over the weekend.
This evening forecast
Low cloud moving in from the west, bringing prolonged spells of rain and drizzle later, with a risk of hill fog and poor visibility overnight. Southwesterly light to moderate winds.
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
Wet morning, but improving through the afternoon.
| 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) |
80% | 80% | 80% | 80% | 30% | 20% | <05% | <05% |
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
9
|
S
12
|
SW
13
|
SW
14
|
SW
12
|
SW
11
|
SW
11
|
SW
10
|
| 300m |
S
3
|
SW
6
|
SW
7
|
SW
10
|
SW
9
|
SW
8
|
SW
7
|
SW
5
|
| Valley |
S
2
|
SW
3
|
SW
6
|
SW
9
|
SW
8
|
SW
6
|
SW
6
|
SW
4
|
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 | 13 | 17 | 16 | 18 | 17 | 15 | 15 | 14 |
| 300m | 8 | 14 | 14 | 18 | 16 | 14 | 14 | 11 |
| Valley | 6 | 12 | 13 | 18 | 16 | 13 | 13 | 10 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
15°
|
14°
|
15°
|
16°
|
16°
|
17°
|
16°
|
14°
|
| 300m |
15°
|
16°
|
16°
|
18°
|
20°
|
20°
|
19°
|
16°
|
| Valley |
16°
|
16°
|
17°
|
18°
|
20°
|
21°
|
19°
|
16°
|
| Freezing Level |
3,700m
|
3,500m
|
3,100m
|
2,900m
|
3,100m
|
2,800m
|
2,400m
|
2,800m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
13°
|
12°
|
13°
|
14°
|
15°
|
16°
|
14°
|
13°
|
| 300m |
16°
|
15°
|
16°
|
17°
|
19°
|
20°
|
18°
|
16°
|
| Valley |
16°
|
16°
|
17°
|
18°
|
20°
|
21°
|
19°
|
16°
|
Additional weather information
Meteorologist's view
Feeling humid from Thursday with a mild and muggy start. Waterproof layers may be needed in prolonged rain and drizzle as a frontal system continues to clear to the east of the region. Some brighter and sunny spells through the afternoon, though slopes may remain slippery.
Weather
A mild and muggy start as low cloud, rain, and drizzle continue spreading east through the morning, with heaviest outbreaks on western upslopes. Cloud breaking up through the afternoon bringing brighter and drier conditions, though scattered showers may be possible during the afternoon.
Chance of cloud-free hill tops
Less than 20%, improving to 70% in the afternoon and evening as rain clears.
Low cloud and visibility
Extensive low cloud in the morning with bases 400-600m, occasionally reducing to 200m in heavy outbursts but improving through the afternoon as cloud bases lift and break up, leaving patchy cloud above 800m with good air clarity allowing far reaching views.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.6mm | 15.6mm | 16.2mm |
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 low cloud and rain moves across the region through the morning, clearing to the east by midday, with infrequent showers following behind.
Chance of cloud-free hill tops
30% in the morning, becoming 80% in the afternoon.
Maximum wind speed expected
Southwesterly 10-25mph with gusts 20-25mph.
Temperature
- At 600m Plus 12 Celsius rising to Plus 16 Celsius.
- Valley Plus 15 Celsius rising to Plus 20 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Generally good visibility, but temporarily deteriorating in rain as cloud bases lower to 300-500m at times. Improving to very good through the afternoon. Good air clarity outside of rain allowing for clear views.
Mountain weather information
Sat 19 Jul
Sunrise:
Sunset:
Unsettled conditions as showers move in from the south, these may be heavy at times particularly over higher ground, with a risk of thunder and hail. Light and variable winds at first, becoming south to southwestherly light to moderate through the afternoon.
Sun 20 Jul
Sunrise:
Sunset:
Unsettled conditions continue with a further risk of widespread showers, expected to be heavy at times with a risk of thunder and hail. South to southeasterly moderate winds.
Mon 21 Jul
Sunrise:
Sunset:
Bright and drier conditions, though a risk of showers in the afternoon. Southwest to westerly light winds initially, increasing to moderate through the afternoon.
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.