Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for initially unsettled conditions probably giving way to temporary drier and settled conditions Tuesday and Wednesday.
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
Mainly dry with sunny spells and light winds today. Outbreaks of rain arriving later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 20% | <05% | <05% | 10% | 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 |
NW
17
|
NW
16
|
W
15
|
SW
17
|
S
19
|
S
23
|
| 300m |
W
8
|
W
9
|
W
10
|
SW
11
|
SW
8
|
S
12
|
| Valley |
W
8
|
W
8
|
W
9
|
W
10
|
SW
5
|
S
10
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 22 | 20 | 20 | 22 | 25 | 30 |
| 300m | 18 | 18 | 18 | 21 | 20 | 27 |
| Valley | 19 | 18 | 18 | 21 | 16 | 25 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
2°
|
3°
|
3°
|
3°
|
3°
|
| 300m |
4°
|
5°
|
6°
|
7°
|
5°
|
6°
|
| Valley |
5°
|
6°
|
7°
|
8°
|
6°
|
6°
|
| Freezing Level |
800m
|
700m
|
700m
|
700m
|
900m
|
1,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-4°
|
-4°
|
-2°
|
-2°
|
-3°
|
-3°
|
| 300m |
1°
|
2°
|
3°
|
4°
|
2°
|
2°
|
| Valley |
2°
|
3°
|
4°
|
5°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
A ridge of high pressure moving east will give a window of settled weather today with some good sunshine for several hours. Note the deteriorating conditions from early evening with winds strengthening slightly and rain arriving.
Weather
Cloudy initially with some patchy rain, most likely across eastern areas. Soon becoming dry this morning with good spells of sunshine developing for much of the day. Cloud and outbreaks of rain will spread east from early evening, with the rain becoming heavy late evening.
Chance of cloud-free hill tops
60% at first becoming 90% this morning, then becoming 50% this evening.
Low cloud and visibility
Occasional cloud above 600m at first, mainly across northern and eastern areas, soon clearing this morning. Cloud becoming occasional above 600m this evening. Visibility outside of cloud mainly good but reductions to a few km or less with rain this evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 6.8mm | 29mm | 31.8mm |
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
Spells of rain, heavy at times through the morning, and also drizzle, combined with winds which gradually strengthen to become strong. However, some temporary drier spells are possible through the afternoon.
Chance of cloud-free hill tops
50%, perhaps temporarily improving 90% for the afternoon.
Maximum wind speed expected
South or Southwest 30 mph gusts 40-45 mph.
Temperature
- At 600m 4C rising to 7C.
- Valley Plus 6C rising to 10 or 11C.
- Freezing level Above summits.
Low cloud and visibility
Occasional poor visibility with cloud and fog down to 600-700m, lower at times on southern slopes overnight and through the morning. Through the afternoon cloud may temporarily lift above summits across northern areas. Visibility outside of cloud mainly good but reductions to a few km or less with rain or drizzle.
Mountain weather information
Mon 2 Mar
Sunrise:
Sunset:
Rain, sometimes heavy through the morning, gradually eases to become light and patchy. Strong southerly winds easing. Freezing level above summits.
Tue 3 Mar
Sunrise:
Sunset:
Low confidence at this stage but dry and brighter conditions with light winds look likely. Freezing level above summits.
Wed 4 Mar
Sunrise:
Sunset:
Dry conditions are likely, although outbreaks of light rain and strengthening winds may arrive later.
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.