Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a day of sunshine and showers, but lower confidence on where the heaviest showers will form.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Sunny spells and showers, some heavy with hail and thunder.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 40% | 70% | 80% | 80% | 60% |
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
2
|
NW
4
|
NW
4
|
NE
5
|
NW
5
|
NE
6
|
| 300m |
W
2
|
NW
3
|
NW
4
|
NE
3
|
NW
4
|
NE
2
|
| Valley |
W
2
|
W
3
|
NW
4
|
NW
2
|
NW
3
|
N
2
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 3 | 6 | 6 | 6 | 7 | 9 |
| 300m | 3 | 5 | 6 | 5 | 7 | 7 |
| Valley | 4 | 5 | 6 | 5 | 6 | 6 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
8°
|
9°
|
11°
|
11°
|
10°
|
9°
|
| 300m |
10°
|
12°
|
14°
|
14°
|
12°
|
10°
|
| Valley |
10°
|
13°
|
15°
|
15°
|
13°
|
11°
|
| Freezing Level |
1,800m
|
1,900m
|
1,900m
|
2,000m
|
2,000m
|
2,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
8°
|
10°
|
10°
|
9°
|
7°
|
| 300m |
9°
|
12°
|
13°
|
14°
|
11°
|
10°
|
| Valley |
10°
|
13°
|
14°
|
15°
|
12°
|
11°
|
Additional weather information
Meteorologist's view
The heavy showers are likely to contain hail and may also produce gusty winds, as well as dropping visibility quite quickly as they pass. A wet ground will make steeper slopes slippery underfoot.
Weather
Cloudy and damp during the early hours, with hill fog in places. Brightening up through the morning, with sunny spells but then an increasing risk of showers across the park. Some of the showers will be heavy during the afternoon and evening, with the risk of hail and thunder.
Chance of cloud-free hill tops
30% during the early hours, rising to 70% through the morning and into the afternoon.
Low cloud and visibility
Poor to very poor visibility during the early hours in hill fog. Generally good or very good during the day, but often dropping to moderate or poor in passing showers. Cloud bases 100m to 300m during the early hours, rising above the summits during the morning. Cloud bases dropping to around 400m to 500m in passing showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 9.8mm | 10.6mm | 10.8mm |
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
Overnight low cloud and drizzle should lift and break during the morning, to leave a drier and brighter afternoon for much of the park. The small risk of a passing light shower.
Chance of cloud-free hill tops
20% during the early hours, rising to 60% during the morning and 80% for the afternoon.
Maximum wind speed expected
Northeasterly 10-15mph gusting 15-20mph.
Temperature
- At 600m plus 5 Celsius, rising to plus 9 Celsius.
- Valley Plus 4 Celsius, rising to plus 16 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Cloud bases of 300m during the early hours, occasionally down to 200m. Lifting to 500m through the morning, but then should be above the summits in the afternoon. Poor to very poor visibility in the hill fog, but conditions improving into the afternoon with good visibility likely.
Mountain weather information
Tue 5 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. A light to moderate northerly wind.
Wed 6 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Feeling colder, with a moderate northerly wind.
Thu 7 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Winds light to moderate and more variable in direction.
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.