Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for a severely cold spell for Bannau Brycheiniog for the first days of 2026, full winter conditions can be expected in the mountains. Uncertainties in amount or likelihood of wintry showers and strength of wind details for each day.
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
A very cold but dry day, with bright or sunny spells developing.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 10% | 10% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
E
17
|
E
16
|
E
14
|
NE
12
|
NE
12
|
NE
10
|
| 300m |
NE
8
|
NE
7
|
NE
8
|
NE
7
|
E
4
|
E
2
|
| Valley |
NE
8
|
NE
7
|
NE
8
|
NE
6
|
E
3
|
SW
2
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 22 | 21 | 18 | 16 | 17 | 15 |
| 300m | 17 | 16 | 15 | 14 | 12 | 7 |
| Valley | 18 | 17 | 16 | 14 | 13 | 6 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
1°
|
1°
|
0°
|
-1°
|
| 300m |
3°
|
2°
|
3°
|
3°
|
1°
|
0°
|
| Valley |
4°
|
3°
|
4°
|
4°
|
1°
|
0°
|
| Freezing Level |
700m
|
600m
|
600m
|
600m
|
500m
|
400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-5°
|
-5°
|
-5°
|
-4°
|
-6°
|
-6°
|
| 300m |
0°
|
-1°
|
0°
|
0°
|
-1°
|
-1°
|
| Valley |
1°
|
0°
|
1°
|
2°
|
0°
|
-2°
|
Additional weather information
Meteorologist's view
The main hazard on the mountains will be the cold conditions, particularly wind-chill on the summits. Prepare for very cold conditions.
Weather
Morning mist and fog will begin to lift and clear early in the morning leaving a bright and dry day with sunny spells developing. Chilly through the day, with the sunshine adding very little warmth and a severe wind-chill expected. Feeling bitterly cold on the hill tops. Very cold overnight with sharp frost expected.
Chance of cloud-free hill tops
95%, after any early mist or low cloud lifts.
Low cloud and visibility
Visibility will be moderate or poor in any early mist and very poor in fog patches but will improve through the morning. Then any cloud is expected to be well above summits leaving a clear day with far reaching views from the hills. Visibility will be generally very good.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0.2mm |
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
Another very cold day to end the year, with plenty of winter sunshine. Cloud building later in the day, but staying dry throughout. Wind-chill is again expected to be an issue on the summits.
Chance of cloud-free hill tops
Generally 80%, after any low cloud lifts in the morning.
Maximum wind speed expected
Northwesterly 10-15mph.
Temperature
- At 600m Minus 4, rising to Minus 1 Celsius.
- Valley Plus 1 rising to Plus 3 Celsius.
- Freezing level 300m.
Low cloud and visibility
Some low cloud possible down to 400-500m first thing in the morning, quickly lifting above the summits. Visibility will be good or very good, but may be moderate to poor in low cloud first thing in the morning.
Mountain weather information
Thu 1 Jan
Sunrise:
Sunset:
A bitterly cold day with strong westerly winds, some wintry showers are possible but also some brighter spells. Snow accumulations are likely at higher levels. Freezing level 400-600m
Fri 2 Jan
Sunrise:
Sunset:
Remaining very cold with some wintry showers and sunny spells. A severe wind chill is expected in strong northwesterly winds. Freezing level 400m lowering to 100m.
Sat 3 Jan
Sunrise:
Sunset:
Freezing conditions continue with severe windchill in the fresh northerly winds, risk of wintry showers. Freezing level 100-200m.
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.