Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall but low on regional detail for showers.
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.
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
Often cloudy but turning brighter in the afternoon. Showers possible.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
60% | 50% | 50% | 40% | 50% | 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 |
NE
9
|
E
8
|
NE
8
|
NE
8
|
NE
8
|
NE
8
|
| 300m |
NE
6
|
NE
7
|
E
6
|
NE
6
|
NE
5
|
NE
4
|
| Valley |
NE
5
|
NE
6
|
E
5
|
E
4
|
NE
4
|
NE
3
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 12 | 11 | 11 | 10 | 11 | 13 |
| 300m | 12 | 12 | 11 | 10 | 10 | 11 |
| Valley | 12 | 11 | 9 | 8 | 9 | 10 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
8°
|
8°
|
9°
|
11°
|
11°
|
9°
|
| 300m |
9°
|
10°
|
12°
|
14°
|
13°
|
11°
|
| Valley |
10°
|
11°
|
13°
|
15°
|
14°
|
11°
|
| Freezing Level |
1,900m
|
1,900m
|
1,900m
|
1,900m
|
1,900m
|
1,900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
5°
|
6°
|
7°
|
9°
|
9°
|
7°
|
| 300m |
8°
|
9°
|
11°
|
13°
|
13°
|
10°
|
| Valley |
9°
|
10°
|
13°
|
14°
|
14°
|
11°
|
Additional weather information
Meteorologist's view
Wet ground still likely present which will make steeper slopes slippery underfoot.
Weather
Overnight low cloud and residual showery rain should lift and break during the morning, to leave a drier and brighter afternoon for much of the park. However, there is a small risk of a heavy shower developing, with a low chance of thunder.
Chance of cloud-free hill tops
20% during the early hours, rising to 60% during the morning and 90% for the afternoon.
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 generally good visibility likely.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 19.6mm | 29.4mm | 30.2mm |
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
Mostly dry with bright or sunny spells and just the chance of an isolated shower.
Chance of cloud-free hill tops
90%
Maximum wind speed expected
Northerly 15-20 mph
Temperature
- At 600m Plus 5 Celsius, rising to plus 9 Celsius.
- Valley Plus 6 Celsius, rising to plus 15 Celsius.
- Freezing level Above summits
Low cloud and visibility
Cloud generally above summits, with generally good to very good visibility.
Mountain weather information
Wed 6 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Feeling cooler, with a moderate northerly wind.
Thu 7 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Winds light to moderate southerly.
Fri 8 May
Sunrise:
Sunset:
Bright or sunny spells and isolated showers. Light to moderate southeasterly 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.