Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Moderate for timing and extent of rain Saturday evening into Sunday. Low for potential of thunderstorms on Sunday.
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
Largely fine if rather cloudy, but potential for rain later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 10% | 10% | 20% | 60% | 80% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
S
11
|
S
9
|
S
8
|
S
7
|
E
5
|
NE
5
|
| 300m |
SW
3
|
S
5
|
S
5
|
S
5
|
SE
3
|
E
2
|
| Valley |
NE
0
|
S
3
|
SE
3
|
S
4
|
S
3
|
N
1
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 14 | 12 | 11 | 10 | 6 | 8 |
| 300m | 10 | 9 | 8 | 8 | 5 | 5 |
| Valley | 8 | 6 | 6 | 8 | 5 | 4 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
9°
|
12°
|
12°
|
10°
|
9°
|
| 300m |
9°
|
12°
|
15°
|
15°
|
12°
|
10°
|
| Valley |
8°
|
13°
|
16°
|
16°
|
12°
|
11°
|
| Freezing Level |
1,300m
|
1,800m
|
2,100m
|
2,200m
|
2,100m
|
2,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
4°
|
7°
|
10°
|
10°
|
9°
|
8°
|
| 300m |
8°
|
12°
|
14°
|
14°
|
12°
|
10°
|
| Valley |
8°
|
13°
|
15°
|
15°
|
12°
|
11°
|
Additional weather information
Meteorologist's view
A mostly fine day to be out walking, though best to go early if possible to avoid rain arriving later.
Weather
A cloudy day overall. This cloud potentially thick enough to produce the odd spot of drizzle over the hills during the early morning, before lifting and allowing a dry mid-morning with the chance of a few bright spells breaking through for a short time. Cloud building again later with the potential for outbreaks of rain to arrive in the afternoon, heavy at times, though their extent is uncertain.
Chance of cloud-free hill tops
60% at first, rising to 80% from the late morning.
Low cloud and visibility
Early cloud as low as 500m over western slopes bringing poor visibility initially. Cloud rising above the summits by late morning, providing good visibility of surroundings for a time, before dropping again as rain arrives later.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.8mm | 1mm | 1mm |
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 rather wet second day of the weekend. Rain and drizzle may turn persistent for a time during the morning before breaking into showers in the afternoon, with some showers turning heavy with the chance of thunder.
Chance of cloud-free hill tops
50% for much of the day, perhaps rising to 80% in the evening.
Maximum wind speed expected
15mph northerly winds on the hills.
Temperature
- At 600m Plus 7 Celsius, rising to plus 10 Celsius.
- Valley Plus 9 Celsius, rising to plus 15 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Poor visibility for much of the day in rain/drizzle and showers. Cloud periodically dropping to 500m throughout the day, most regularly on eastern slopes. Cloud gradually lifting later, potentially rising above the summits into the evening.
Mountain weather information
Mon 4 May
Sunrise:
Sunset:
Predominantly fine with showers easing and a greater chance of bright or sunny spells emerging throughout the day. Gentle northerly winds.
Tue 5 May
Sunrise:
Sunset:
Early cloud lifting to leave a largely dry day with sunny spells. Moderate to fresh northerly winds on the hills. Feeling cooler with freezing levels dropping just above the summits by night.
Wed 6 May
Sunrise:
Sunset:
A bright day with sunny spells, though showers possibly arriving later in the day. Moderate northerly winds. Freezing level hovering around the summit.
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.