Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for high pressure maintaining relatively settled conditions but low for the cloud detail.
This evening forecast
Rather cloudy but most staying dry. Moderate easterly summit breezes.
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.
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
Rather cloudy, particularly in east. Mainly dry. Moderate breezes.
| 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% | <05% | <05% | 00% | 00% | 00% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
E
10
|
E
10
|
NE
10
|
NE
11
|
NE
11
|
NE
10
|
E
9
|
E
9
|
| 300m |
NE
5
|
E
4
|
NE
5
|
NE
7
|
NE
9
|
NE
8
|
E
5
|
E
4
|
| Valley |
E
4
|
E
3
|
NE
4
|
E
6
|
E
8
|
NE
7
|
E
5
|
E
4
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m | 15 | 15 | 14 | 15 | 16 | 14 | 14 | 15 |
| 300m | 12 | 11 | 11 | 13 | 15 | 14 | 12 | 10 |
| Valley | 11 | 10 | 11 | 12 | 14 | 14 | 13 | 11 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
7°
|
6°
|
6°
|
7°
|
8°
|
6°
|
6°
|
| 300m |
9°
|
8°
|
8°
|
9°
|
10°
|
11°
|
8°
|
7°
|
| Valley |
10°
|
9°
|
9°
|
10°
|
11°
|
12°
|
9°
|
8°
|
| Freezing Level |
2,300m
|
2,400m
|
2,300m
|
2,400m
|
2,400m
|
2,400m
|
2,400m
|
2,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
5°
|
4°
|
3°
|
2°
|
4°
|
5°
|
4°
|
3°
|
| 300m |
8°
|
7°
|
7°
|
7°
|
8°
|
9°
|
7°
|
6°
|
| Valley |
9°
|
8°
|
8°
|
8°
|
10°
|
10°
|
8°
|
7°
|
Additional weather information
Meteorologist's view
Navigation difficult at times in quite extensive hill fog.
Weather
Quite a lot of low cloud shrouding eastern hills, particularly early and late in the day. Best of brighter spells appearing during the afternoon and in the west, but also prolonged sunshine above the inversion which will be around 700m. Most staying dry but the chance of a few outbreaks of light rain, drizzle, mist and fog appearing.
Chance of cloud-free hill tops
80% above 700m, below this level 50% in west, 25% in east, due to inversion but low confidence in this detail
Low cloud and visibility
Occasional or quite extensive low cloud below around 700m, particularly in the east both early and late in the day, but none above the inversion and tending to break below at times, chiefly during the afternoon and in the west. Visibility becoming moderate or poor in mist and rain, very poor in fog and within cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0.2mm | 0.2mm |
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
Similar expectations to Wednesday with low cloud quite extensive in the east, but more broken in the west, with some limited drizzle and a risk of valley mist and fog. Sunshine extensive above the inversion, occasionally penetrating below, particularly for the afternoon and in the west, but detail remains elusive.
Chance of cloud-free hill tops
80% above 700m, below this level 50% in west, 25% in east, due to inversion but low confidence in this detail
Maximum wind speed expected
East less than 15mph
Temperature
- At 600m Plus 5 rising to 8 Celsius
- Valley Plus 7 rising to 16 Celsius
- Freezing level Above summits
Low cloud and visibility
Occasional or quite extensive low cloud below around 700m, particularly in the east both early and late in the day, but none above the inversion and tending to break below at times, chiefly during the afternoon and in the west. Visibility becoming moderate or poor in mist and rain, very poor in fog and within cloud.
Mountain weather information
Sat 18 Oct
Sunrise:
Sunset:
Mostly dry, quite a lot of low cloud tending to thin for the afternoon. Moderate easterly summit winds. Freezing level above all peaks.
Sun 19 Oct
Sunrise:
Sunset:
Mostly dry, quite a lot of low cloud tending to thin for the afternoon. Moderate to fresh southeast summit winds. Freezing level above all peaks.
Mon 20 Oct
Sunrise:
Sunset:
Dry, rather cloudy start. Cloud thickening later in the day to bring periods of rain, as southeast summit winds freshen. Freezing level above all peaks.
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.