Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for the general synoptic pattern, with low cloud at first and rain later on Sunday, and a trend towards colder temperatures towards Christmas with easterly winds drawing in cold air. Lower confidence in cloud details for any particular day.
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.
Mountain weather forecast
Mist or fog at first, slowly clearing, with outbreaks of rain or drizzle at times.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 20% | 20% | 60% | 60% | 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 |
SE
11
|
SE
13
|
E
15
|
E
17
|
E
17
|
E
17
|
| 300m |
E
4
|
E
6
|
E
8
|
E
9
|
E
8
|
NE
8
|
| Valley |
E
4
|
E
5
|
E
7
|
E
7
|
E
6
|
E
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 14 | 18 | 20 | 23 | 24 | 23 |
| 300m | 9 | 11 | 15 | 19 | 18 | 17 |
| Valley | 8 | 12 | 15 | 18 | 17 | 17 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
5°
|
4°
|
5°
|
5°
|
5°
|
5°
|
| 300m |
6°
|
6°
|
7°
|
7°
|
7°
|
7°
|
| Valley |
6°
|
6°
|
7°
|
8°
|
7°
|
7°
|
| Freezing Level |
1,300m
|
1,200m
|
1,200m
|
1,400m
|
1,400m
|
1,600m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
0°
|
0°
|
1°
|
0°
|
| 300m |
4°
|
4°
|
4°
|
4°
|
4°
|
4°
|
| Valley |
5°
|
4°
|
6°
|
6°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
Feeling chilly, with poor visibility and extensive cloud at first in the morning. Conditions perhaps improving for a short time in the afternoon, before wet conditions arrive again.
Weather
Mostly dry to start with widespread cloud, some mist, light drizzle and also hill fog. This likely to lift late in the morning or early afternoon. The best conditions are likely to be in the west of the area in the morning. Rain and drizzle spreading in from the south in the afternoon, turning heavy at times through the afternoon and evening.
Chance of cloud-free hill tops
20% in the morning, with the best chance in the south and west. This increasing to 60% for a time in the afternoon, before becoming 20% again by later afternoon.
Low cloud and visibility
Widespread low cloud around in the morning, with bases 100-200m, and associated poor visibility. The cloud will lift by the afternoon to 800m, with moderate to good visibility possible for a time in between any rain or drizzle. As further low cloud moves in during the afternoon, the bases will drop down to 400-500m again, with poor visibility in association with the precipitation.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 5mm | 9mm | 21.4mm |
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
Low cloud, light drizzle and hill fog likely at first, clearing quite quickly in the morning to leave a dry day with some brighter spells.
Chance of cloud-free hill tops
20% becoming 80% by late morning.
Maximum wind speed expected
Southeasterly 15 mph.
Temperature
- At 600m Plus 5 Celsius.
- Valley Plus 9 Celsius.
- Freezing level Above all summits
Low cloud and visibility
Scattered or broken layers of cloud above 400-500m at first, with poor visibility. This improving by mid-morning to become good visibility, with scattered or broken amounts of cloud above summits.
Mountain weather information
Tue 23 Dec
Sunrise:
Sunset:
Turning colder in freshening easterly winds. Quite a cloudy day especially for eastern mountains, with some persistent hill fog here, perhaps some brighter spells in the west. Some outbreaks of drizzle possible too.
Wed 24 Dec
Sunrise:
Sunset:
A bitterly cold day with fresh or strong easterly winds, some winter sunshine likely but doing little for the cold feel, mainly good visibility with cloud above the hill tops.
Thu 25 Dec
Sunrise:
Sunset:
Likely to be bitterly cold and a cloudy Christmas day, with strong easterly or northeasterly 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.