Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high confidence. Some uncertainty in persistence of heavy rain on Monday and timing of rain band Wednesday.
This evening forecast
A cloudy evening with hill fog and some patchy rain at first. Turning dry late evening with a chance of some clear spells. Fresh northwest winds across the tops, gusting 30 mph. Freezing level above the summits.
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.
Mountain weather forecast
Dry with sunny spells, but strong winds and rain from late evening.
| 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) |
<05% | <05% | 00% | 00% | 00% | 20% | 20% | 80% |
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 |
NW
17
|
NW
14
|
NW
15
|
W
12
|
W
13
|
SW
15
|
S
19
|
S
26
|
| 300m |
NW
8
|
W
6
|
W
8
|
W
6
|
W
9
|
SW
9
|
S
11
|
S
14
|
| Valley |
NW
7
|
W
6
|
W
7
|
W
6
|
W
7
|
SW
7
|
SW
10
|
SW
11
|
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 | 23 | 21 | 21 | 18 | 18 | 20 | 26 | 36 |
| 300m | 17 | 16 | 18 | 14 | 16 | 18 | 23 | 29 |
| Valley | 17 | 16 | 17 | 13 | 15 | 16 | 23 | 27 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
1°
|
1°
|
1°
|
3°
|
3°
|
3°
|
3°
|
| 300m |
3°
|
2°
|
2°
|
3°
|
5°
|
5°
|
5°
|
5°
|
| Valley |
4°
|
3°
|
3°
|
3°
|
6°
|
6°
|
6°
|
6°
|
| Freezing Level |
700m
|
600m
|
600m
|
700m
|
700m
|
800m
|
1,000m
|
1,200m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-5°
|
-5°
|
-5°
|
-4°
|
-2°
|
-2°
|
-3°
|
-3°
|
| 300m |
0°
|
0°
|
-1°
|
0°
|
2°
|
2°
|
1°
|
1°
|
| Valley |
1°
|
0°
|
0°
|
1°
|
4°
|
4°
|
3°
|
3°
|
Additional weather information
Meteorologist's view
Increasing winds will give a notable chill through the afternoon. Note deteriorating conditions overnight with strong winds and heavy rain giving a risk of flooding.
Weather
Dry through the early hours and much of the day with clear then sunny spells. Cloud thickens through the afternoon with a few light showers late afternoon and early evening. Strengthening winds and persistent rain spreads east late evening, turning heavy towards midnight.
Chance of cloud-free hill tops
90% or more during the day. Falling to 40% in the evening.
Low cloud and visibility
Very good or excellent visibility with hills cloud free for much of the day. Patchy cloud lowering onto the highest summits late afternoon. Visibility falling to poor through the evening and start of the night in increasingly heavy rain and cloud lowering to 500-600m.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 27.4mm | 30.8mm | 37mm |
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
Strong winds and heavy persistent rain through the early hours. Conditions then deteriorating further during the day with severe gales and persistent heavy rain through much of the day with a risk of widespread flooding. Winds and rain easing towards midnight.
Chance of cloud-free hill tops
Nil
Maximum wind speed expected
Southwest 40-45 gusting 55-60 mph across the summits. Easing to 20-25 mph in the evening.
Temperature
- At 600m Plus 6 Celsius rising to 9 Celsius
- Valley Plus 6 Celsius rising to 10 Celsius
- Freezing level Above the summits
Low cloud and visibility
Very poor visibility in persistent heavy rain and extensive cloud down to 400m.
Mountain weather information
Tue 2 Dec
Sunrise:
Sunset:
Overnight rain clears to a largely dry day with sunny spells, a few well scattered showers possible. Moderate southwest winds. Freezing level above the summits.
Wed 3 Dec
Sunrise:
Sunset:
Generally cloudy with hill fog. Dry to start, but some showery rain for a time. Further rain possible at the end of the day. Moderate southwest winds. Freezing level above the summits.
Thu 4 Dec
Sunrise:
Sunset:
Strong southerly winds with heavy rain sweeping east. This clears to drier brighter conditions and lighter winds later in the day. Freezing level above the summits.
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.