Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled weather to continue. Low for daily detail.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
Mountain weather forecast
Cloudy with outbreaks of rain, becoming persistent later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 80% | 50% | 80% | >95% | 70% |
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
16
|
S
20
|
SE
25
|
SE
23
|
SE
22
|
SE
16
|
| 300m |
SE
5
|
SE
6
|
SE
12
|
SE
11
|
SE
10
|
E
7
|
| Valley |
E
3
|
E
3
|
SE
10
|
SE
9
|
E
8
|
E
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 20 | 27 | 33 | 31 | 30 | 24 |
| 300m | 16 | 16 | 27 | 24 | 23 | 17 |
| Valley | 10 | 12 | 23 | 22 | 20 | 16 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
4°
|
4°
|
5°
|
5°
|
5°
|
5°
|
| 300m |
6°
|
7°
|
8°
|
8°
|
7°
|
6°
|
| Valley |
6°
|
7°
|
9°
|
8°
|
7°
|
7°
|
| Freezing Level |
1,200m
|
1,200m
|
1,200m
|
1,400m
|
1,500m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
-1°
|
-1°
|
-1°
|
-1°
|
0°
|
| 300m |
4°
|
5°
|
5°
|
5°
|
4°
|
4°
|
| Valley |
6°
|
6°
|
6°
|
6°
|
5°
|
5°
|
Additional weather information
Meteorologist's view
Strengthening winds developing during the afternoon with higher summit winds leading to drenching conditions.
Weather
A cloudy day with rain and drizzle with drier weather very short-lived. Persistent and occasionally heavy rain will spread northwards through later in the afternoon and continue through the evening with rain easing towards midnight.
Chance of cloud-free hill tops
60% soon becoming 40%, near-nil by midnight.
Low cloud and visibility
Poor in areas of cloud around 500 metres, mainly eastern upslopes at first. Otherwise areas of cloud down to 800 metres shrouding the higher tops, this becoming more extensive down to 600 metres as rain sets in later in the afternoon, lowering to 400m later.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3mm | 22mm | 31.2mm |
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
Cloudy in the morning with the chance of a few showers. Remaining cloudy through the afternoon with persistent and occasionally heavy rain extending northeast across the Brecon Beacons. Drier for a spell in the evening, before further heavy rain.
Chance of cloud-free hill tops
Near-nil, becoming 30% in the afternoon for a time.
Maximum wind speed expected
Southeasterly 20-25 mph.
Temperature
- At 600m Plus 5 Celsius
- Valley Plus 6 rising to 10 Celsius
- Freezing level Above the summits
Low cloud and visibility
Poor in widespread cloud down to 300 to 600 metres in the morning. Cloud base will rise to 500 to 700 metres for a time during the afternoon, the highest bases likely during the first part of the afternoon.
Mountain weather information
Wed 11 Feb
Sunrise:
Sunset:
Remaining unsettled with showers or occasionally longer spells of rain. Strong southwesterly summit winds. Freezing level above summits.
Thu 12 Feb
Sunrise:
Sunset:
Cloudy with showery rain. Moderate to strong westerly summit winds. Freezing level falling to around summits.
Fri 13 Feb
Sunrise:
Sunset:
Turning much colder with sleet or snow at first then mainly dry and bright. Strong cold north or northeasterly winds. Freezing level falling to 400m.
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.