
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence in overall more changeable theme. Lower confidence regarding detail in timing, duration, and intensity of showers and associated thunderstorm risk over the weekend.
This evening forecast
Dry evening with cloud building into the night.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Thunderstorms
Strong Sunlight
Mountain weather forecast
Largely dry with the odd heavy shower.
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) |
<05% | 60% | 60% | 30% | 60% | 60% | 30% | 20% |
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
600m |
W
4
|
N
4
|
N
4
|
SW
5
|
SW
7
|
SW
10
|
SW
9
|
S
12
|
300m |
W
2
|
W
2
|
NW
2
|
W
3
|
SW
5
|
SW
8
|
SW
5
|
SE
5
|
Valley |
W
3
|
W
2
|
NW
2
|
W
3
|
SW
5
|
SW
7
|
SW
4
|
SE
4
|
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
600m | 5 | 5 | 5 | 7 | 11 | 15 | 13 | 17 |
300m | 6 | 4 | 3 | 6 | 9 | 14 | 11 | 12 |
Valley | 6 | 4 | 3 | 6 | 9 | 14 | 9 | 9 |
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
600m |
13°
|
13°
|
12°
|
14°
|
16°
|
17°
|
16°
|
14°
|
300m |
14°
|
14°
|
14°
|
17°
|
19°
|
20°
|
18°
|
16°
|
Valley |
15°
|
14°
|
15°
|
18°
|
20°
|
21°
|
18°
|
16°
|
Freezing Level |
2,700m
|
3,000m
|
2,900m
|
2,900m
|
2,700m
|
2,600m
|
2,800m
|
2,800m
|
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
600m |
12°
|
12°
|
12°
|
14°
|
15°
|
15°
|
14°
|
12°
|
300m |
14°
|
14°
|
14°
|
17°
|
19°
|
19°
|
18°
|
15°
|
Valley |
15°
|
15°
|
15°
|
18°
|
20°
|
20°
|
19°
|
16°
|
Additional weather information
Meteorologist's view
Waterproof advised with possible sudden downpours causing poor visibilities. Strong sunshine with high UV levels.
Weather
Largely cloudy to start with heavy, possibly thundery showers pushing northwards. Cloud breaking to leave sunnier spells but also the continued risk of showers. Showers easing during the evening ahead of further cloud and rain by midnight.
Chance of cloud-free hill tops
60% in the west with low cloud, then 80%
Low cloud and visibility
Cloud bases will be mainly above the summits, however there may be sudden drops to 400-600m through the afternoon if showers or thunderstorms develop in the area. Generally very good visibility, though deteriorations expected in heavy showers.
Recent rainfall
Last 24 hours | Last 48 hours | Last 72 hours |
---|---|---|
4.6mm | 7.2mm | 20.2mm |
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
Unsettled with widespread showers which may turn heavy and thundery through the course of the day, with hail showers also a risk. Warm and humid in the valley, though breezier than recent days.
Chance of cloud-free hill tops
30% during the morning, rising to 70%.
Maximum wind speed expected
Southerly 15-20 mph gusting 30mph.
Temperature
- At 600m Plus 12 Celsius rising to plus 16 Celsius.
- Valley Plus 16 Celsius rising to plus 21 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low cloud down to 400 m at first, then cloud bases mainly above the summits by mid-morning, however there may be sudden drops to 400-600m through the afternoon around heavy downpours. Generally very good visibility, though deteriorations expected in heavy showers.
Mountain weather information
Mon 21 Jul
Brighter and drier conditions expected though the odd heavy shower still possible. Moderate northwesterly winds.
Tue 22 Jul
Drier than recent days with sunny spells developing through the afternoon. Winds easing to moderate westerlies.
Wed 23 Jul
Similar with a few showers or longer spells of rain. Moderate northwesterly winds.
Summit specific forecast
Mountain summit forecast map
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.