Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather pattern, but lowering for the transitional timing detail.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Isolated wintry showers. Severe chill effect. Strong winds gradually easing.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 30% | 40% | 30% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
W
17
|
NW
21
|
NW
23
|
NW
23
|
NW
18
|
W
13
|
| 300m |
W
8
|
W
13
|
NW
14
|
NW
14
|
W
8
|
W
6
|
| Valley |
W
7
|
W
12
|
NW
13
|
NW
13
|
W
7
|
W
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 23 | 27 | 30 | 30 | 23 | 19 |
| 300m | 19 | 25 | 27 | 28 | 18 | 15 |
| Valley | 18 | 25 | 27 | 27 | 18 | 15 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
1°
|
2°
|
2°
|
2°
|
2°
|
| 300m |
3°
|
4°
|
6°
|
6°
|
4°
|
3°
|
| Valley |
3°
|
5°
|
6°
|
7°
|
5°
|
4°
|
| Freezing Level |
500m
|
500m
|
500m
|
600m
|
600m
|
700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-6°
|
-6°
|
-5°
|
-4°
|
-4°
|
-3°
|
| 300m |
-1°
|
0°
|
1°
|
2°
|
1°
|
0°
|
| Valley |
0°
|
2°
|
3°
|
4°
|
3°
|
1°
|
Additional weather information
Meteorologist's view
Severe chill effect at height.
Weather
Isolated showers of sleet and rain, perhaps hail, most likely mid-morning to mid-afternoon, possibly heavy at times through late morning and early afternoon. From mid-afternoon showers mostly die away, leaving clear periods.
Chance of cloud-free hill tops
90% or more becoming 60% mid to late morning, then 80% from late-afternoon.
Low cloud and visibility
Distant hills visible for much of the time, but occasional decreasing to near-by hills with the showers, and to very poor conditions in cloud. Bases perhaps temporarily decreasing 600-700m with heaviest showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 4.6mm | 5.4mm | 13.8mm |
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
Dry but becoming cloudy overnight. Through the morning a little light rain or drizzle is possible, until late morning when rain, often heavy, arrives. Rain eases to become mostly light late afternoon, then clears southwards through the evening. Dry and clear conditions follow. Strong summit winds developing.
Chance of cloud-free hill tops
90% but becoming 10% or less through the afternoon.
Maximum wind speed expected
West or southwest increasing by mid-day to mean 30mph with gusts reaching 45mph across exposed ridges and summits.
Temperature
- At 600m Plus 1 Celsius increasing 4 Celsius for the afternoon
- Valley Plus 2 Celsius increasing 12 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Distant hills clearly visible then decreasing to near-by hills with rain, and poor or very poor within cloud. Bases becoming extensive from 500m through the afternoon, before clearing through the evening.
Mountain weather information
Mon 30 Mar
Sunrise:
Sunset:
Mainly dry with brighter spells. Strong winds. Freezing level above summits.
Tue 31 Mar
Sunrise:
Sunset:
Cloudy and mainly dry, with a chance of patchy light rain. Light winds. Freezing level above the summits.
Wed 1 Apr
Sunrise:
Sunset:
Cloudy with occasional light rain. Fresh winds. Freezing level 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.