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.
This evening forecast
Partly cloudy but clear spells developing, mist and fog forming in prone spots. Fresh strong northeasterly winds and feeling very cold through the evening.
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
A very cold day out on the mountains, early mist and fog patches will clear with some bright or sunny spells developing and remaining dry.
| 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) |
10% | 10% | <05% | 10% | 10% | 10% | 10% | 10% |
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 |
E
16
|
NE
15
|
E
16
|
E
15
|
NE
14
|
NE
13
|
NE
12
|
NE
11
|
| 300m |
E
7
|
NE
8
|
NE
8
|
E
7
|
NE
9
|
NE
7
|
NE
4
|
E
3
|
| Valley |
NE
7
|
NE
7
|
NE
8
|
NE
7
|
NE
9
|
NE
7
|
NE
4
|
SE
3
|
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 | 21 | 21 | 22 | 21 | 19 | 18 | 18 | 16 |
| 300m | 16 | 17 | 17 | 16 | 17 | 16 | 13 | 8 |
| Valley | 19 | 18 | 18 | 18 | 18 | 16 | 13 | 7 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
2°
|
1°
|
0°
|
0°
|
1°
|
-1°
|
-1°
|
| 300m |
3°
|
3°
|
3°
|
2°
|
3°
|
3°
|
1°
|
-1°
|
| Valley |
4°
|
4°
|
4°
|
3°
|
4°
|
4°
|
1°
|
-1°
|
| Freezing Level |
800m
|
800m
|
700m
|
500m
|
500m
|
500m
|
400m
|
300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-4°
|
-4°
|
-5°
|
-6°
|
-5°
|
-4°
|
-6°
|
-6°
|
| 300m |
0°
|
0°
|
0°
|
-1°
|
0°
|
0°
|
-1°
|
-2°
|
| Valley |
1°
|
1°
|
0°
|
0°
|
1°
|
1°
|
-1°
|
-3°
|
Additional weather information
Meteorologist's view
The main hazard on the mountains will be the effects of the cold at height and the added chilling effect of the northeasterly winds. Prepare for very cold conditions.
Weather
Feeling very cold overnight and mist and fog forming in many places, a frost is likely too. Morning mist and fog will begin to lift and clear leaving a bright and dry day with sunny spells developing. Feeling very cold with the sunshine adding very little warmth, a severe windchill is expected and this will be bitterly cold on the hill tops.
Chance of cloud-free hill tops
95%, a few early morning patches of cloud.
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. Any cloud will be well above summits leaving a clear day with far reaching views from the hills, visibility will become 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
The last day of the year will be another very cold one with plenty of winter sunshine but also turning dull later in the day as cloud gathers in the afternoon. Light northwesterly winds will add to the cold effect.
Chance of cloud-free hill tops
80% some cloud forming around the tops in the afternoon.
Maximum wind speed expected
Northwesterly 10-15mph
Temperature
- At 600m Minus 5 rising to Minus 1 Celsius.
- Valley Minus 4 rising to Plus 3 Celsius.
- Freezing level 300m.
Low cloud and visibility
Cloud mostly above the summits in the morning but patchy or scattered low cloud will form in the afternoon near mountain tops, reducing visibility for a time.
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 500m
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 surface level.
Sat 3 Jan
Sunrise:
Sunset:
Freezing conditions continue with severe windchill in the fresh northerly winds, risk of wintry showers. Freezing level at surface level.
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.