Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for an unsettled theme, lower in how persistent and the northern extent of overnight rainfall.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Unsettled with heavy rain followed by blustery showers.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 70% | 70% | 60% | 60% | 40% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SW
26
|
SW
21
|
SW
23
|
W
24
|
W
22
|
SW
18
|
| 300m |
SW
14
|
SW
12
|
SW
13
|
W
16
|
W
13
|
SW
11
|
| Valley |
SW
11
|
SW
10
|
SW
12
|
W
15
|
W
12
|
SW
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 33 | 27 | 30 | 32 | 30 | 26 |
| 300m | 30 | 24 | 25 | 30 | 26 | 24 |
| Valley | 28 | 23 | 24 | 31 | 26 | 22 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
14°
|
13°
|
13°
|
12°
|
11°
|
10°
|
| 300m |
15°
|
15°
|
15°
|
15°
|
14°
|
12°
|
| Valley |
16°
|
16°
|
16°
|
16°
|
14°
|
13°
|
| Freezing Level |
3,000m
|
2,700m
|
2,600m
|
2,400m
|
2,200m
|
2,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
9°
|
9°
|
9°
|
8°
|
8°
|
7°
|
| 300m |
13°
|
13°
|
13°
|
12°
|
11°
|
10°
|
| Valley |
14°
|
14°
|
14°
|
13°
|
12°
|
11°
|
Additional weather information
Meteorologist's view
The heavy rain and showers will mean that waterproofs are highly advised, and it will be very slippery underfoot. The strong winds too may cause some buffeting on the summits and walkers should take care, as sudden deteriorations in visibility will be expected in association with heavy showers and rain.
Weather
Wet and windy across the Park through the morning, with cloud and rain spreading in from the southwest. Remaining blustery into the afternoon, with frequent showers developing, which may be heavy at times and possibly thunder too. However, some breaks in the cloud may develop in the afternoon, allowing the odd sunny spell to develop. Becoming mostly dry through the evening, with winds easing.
Chance of cloud-free hill tops
10% through the morning, becoming 60% by late afternoon.
Low cloud and visibility
Widespread low cloud will cover the summits above 400m through the morning, with very poor visibility in prolonged and sometimes heavy spells of rain. Brighter later with cloud mostly lifting to above the summits. Very good visibility in drier periods, with excellent air quality allowing for far reaching views of distant peaks, however sharp, sudden deteriorations are expected during showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3.6mm | 16mm | 20.8mm |
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
Heavy thundery downpours during the early hours, clearing by late-morning to leave a day of sunshine and scattered blustery showers. These heavy at times with the odd rumble of thunder, before easing into the late evening.
Chance of cloud-free hill tops
40% first thing, then rising to 70% by midday.
Maximum wind speed expected
Southwesterly 20-30 mph.
Temperature
- At 600m Plus 9 Celsius rising to plus 12 Celsius.
- Valley Plus 12 Celsius rising to plus 18 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patchy low cloud down to 400m during the morning, mostly lifting above summits by midday. Poor visibility at first but improving through the day.
Mountain weather information
Fri 5 Sep
Sunrise:
Sunset:
Cloudy at first, but dry with sunny spells expected to develop throughout the day. The odd light shower can't be ruled out, but most places remaining dry with moderate to fresh southwesterly winds.
Sat 6 Sep
Sunrise:
Sunset:
Another more settled day, with spells of warm sunshine in sheltered spots. Mostly dry, but skies likely turning hazy into the afternoon as cloud approaches from the west. A few spots of rain arriving later.
Sun 7 Sep
Sunrise:
Sunset:
Turning more unsettled with outbreaks of rain and stronger winds. Moderate southerly 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.