Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for cold, showery conditions at first then gradually becoming less cold with winds and showers easing as high pressure tries to build from the west, but lower with regard to shower distribution and timing.
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.
Mountain weather forecast
Sunny spells and isolated wintry showers. Cold northerly winds.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 40% | 10% | 20% | 20% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
NW
8
|
N
12
|
N
17
|
N
17
|
N
16
|
N
16
|
| 300m |
W
4
|
NW
6
|
N
12
|
N
10
|
NE
8
|
N
8
|
| Valley |
W
4
|
NW
5
|
N
10
|
N
9
|
N
7
|
N
7
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m | 11 | 15 | 23 | 22 | 21 | 21 |
| 300m | 9 | 11 | 21 | 19 | 17 | 18 |
| Valley | 10 | 10 | 20 | 18 | 16 | 17 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
2°
|
2°
|
1°
|
0°
|
| 300m |
1°
|
3°
|
6°
|
5°
|
4°
|
2°
|
| Valley |
2°
|
4°
|
6°
|
6°
|
4°
|
2°
|
| Freezing Level |
500m
|
600m
|
500m
|
600m
|
600m
|
500m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
-4°
|
-5°
|
-4°
|
-4°
|
-4°
|
-6°
|
| 300m |
-1°
|
0°
|
2°
|
2°
|
0°
|
-2°
|
| Valley |
0°
|
2°
|
3°
|
3°
|
2°
|
0°
|
Additional weather information
Meteorologist's view
Gusts around 35mph over higher ridges and summits with a significant chill effect.
Weather
A cloudy start to the day with outbreaks of light rain. Cloud soon clears to a bright and sunny day with scattered cloud increasing towards midday bringing the risk of a few wintry showers, with snow above about 600m, for the afternoon and evening.
Chance of cloud-free hill tops
40% at first, increasing to 85% by midday.
Low cloud and visibility
Cloud covering hills above 500-600m at first, rising above summits by mid-morning. Scattered cloud obscuring summits above 600m in any wintry showers. Away from cloud visibility, excellent falling to several kilometres in showers, and perhaps a kilometre in snow.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 1mm | 1mm |
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
Mainly dry with long clear spells overnight with isolated fog patches possible, quickly burning away then a bright day with some good spells of sunshine, just the odd light wintry shower.
Chance of cloud-free hill tops
90% or more.
Maximum wind speed expected
Northeasterly 15-20mph with gusts up to 30mph.
Temperature
- At 600m Around minus 04 Celsius rising to plus 02 Celsius by day
- Valley Around zero Celsius at dawn rising to plus 7 or 8 Celsius by day
- Freezing level Around 300-400m rising close to the highest summits by day
Low cloud and visibility
Only small amounts of cloud expected below the summits, mainly above 750m. Poor visibility in any localised fog patches early on, becoming excellent, then falling to several kilometres in showers.
Mountain weather information
Fri 14 Mar
Sunrise:
Sunset:
Clear or sunny spells and a few showers, wintry on higher summits. Occasionally fresh northeasterly winds. Freezing level 450m, rising close to highest summits for a time.
Sat 15 Mar
Sunrise:
Sunset:
Mainly dry with long clear or sunny spells. Moderate northeasterly breeze. Freezing level 450m, rising close to highest summits for a time.
Sun 16 Mar
Sunrise:
Sunset:
Largely dry with clear or sunny spells. Moderate northeasterly winds. Freezing level 450m, rising above the summits for a time.
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.