Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a wet start and very windy day Tuesday and for generally mild, unsettled and often windy conditions continuing through into the weekend, but lower for timings of arrival and clearance of more persistent bands of rain.
This evening forecast
Cloudy with outbreaks of mostly light rain, however the rain becomes more persistent and heavier towards midnight. Strengthening southerly winds, gusts around 45mph over ridges and summits.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
Storm Force Winds
Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.
Mountain weather forecast
Wet morning, becoming drier through afternoon. Very windy.
| 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) |
>95% | >95% | 80% | 70% | 60% | 30% | 10% | <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 |
S
27
|
S
34
|
S
37
|
S
40
|
S
39
|
SW
34
|
SW
30
|
SW
27
|
| 300m |
S
14
|
S
19
|
S
21
|
S
25
|
SW
24
|
SW
22
|
SW
18
|
SW
17
|
| Valley |
S
11
|
S
16
|
S
17
|
S
21
|
S
20
|
SW
19
|
SW
15
|
SW
14
|
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 | 35 | 43 | 47 | 52 | 53 | 47 | 41 | 38 |
| 300m | 31 | 39 | 43 | 49 | 48 | 43 | 36 | 34 |
| Valley | 29 | 37 | 41 | 47 | 45 | 41 | 33 | 32 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
9°
|
9°
|
10°
|
11°
|
10°
|
8°
|
7°
|
7°
|
| 300m |
11°
|
11°
|
12°
|
12°
|
12°
|
11°
|
9°
|
9°
|
| Valley |
11°
|
12°
|
12°
|
13°
|
13°
|
11°
|
10°
|
9°
|
| Freezing Level |
2,700m
|
3,100m
|
3,100m
|
3,200m
|
2,800m
|
1,700m
|
1,500m
|
1,400m
|
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°
|
5°
|
5°
|
5°
|
3°
|
2°
|
1°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
8°
|
7°
|
6°
|
5°
|
| Valley |
9°
|
9°
|
9°
|
9°
|
9°
|
8°
|
7°
|
6°
|
Additional weather information
Meteorologist's view
Despite relative mild conditions, with heavy rain and winds increasing to gust around 60-70mph over ridges and summits, there will be a significant chill effect. Warm, waterproof clothing will be essential.
Weather
Cloudy with heavy and persistent through the early hours. A wet start with further, initially heavy, rain turning lighter through the morning. The rain clears from the west through the afternoon with some late sunny spells developing. Mainly dry this evening with clear spells. It will be very wet underfoot with swollen watercourses.
Chance of cloud-free hill tops
Little chance through the morning improving to 60% through the afternoon, then improving further though the late afternoon and evening.
Low cloud and visibility
Periods or persistent cloud above 450m to 600m, with patches below through the morning, lifting and becoming occasional above 600-750m in the afternoon, the cloud then becoming widely occasional through the late afternoon and evening. Away from cloud, visibility good falling to several kilometres in rain, becoming very good or excellent in the evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 6.6mm | 19.2mm | 73.4mm |
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
Occasionally heavy showers and clear spells through the early hours. Then a bright day with sunny spells and, especially through the morning, occasional showers. Dry with clear spells through the evening.
Chance of cloud-free hill tops
Around 60%
Maximum wind speed expected
Southwesterly 25-30mph, with gusts around 45mph over higher peaks.
Temperature
- At 600m Around plus 7 or 8 Celsius
- Valley Around plus 7 or 8 Celsius rising to plus 11 or 12 Celsius by day
- Freezing level Above the summits
Low cloud and visibility
Occasional or periods of cloud above 600-750m. Away from cloud visibility very good or excellent, falling briefly in showers.
Mountain weather information
Thu 11 Dec
Sunrise:
Sunset:
Rather cloudy with, especially in the afternoon, patchy rain and drizzle. Occasionally strong southwesterly winds. Freezing level above the summits.
Fri 12 Dec
Sunrise:
Sunset:
Band of occasionally heavy rain pushes east in morning then a dry afternoon with sunny spells. Occasionally strong southerly or southwesterly winds easing later. Freezing level above summits.
Sat 13 Dec
Sunrise:
Sunset:
Dry, bright start but becoming cloudy with outbreaks of afternoon rain. Strengthening southwesterly winds. Freezing levels above the summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.