Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for gradually becoming more settled through Friday and a largely fine day Saturday but confidence falling over timing of arrival of snow Sunday and then very low from Monday due to uncertainties over the track of a low, currently expected to move east across northern England.
This evening forecast
Clear spells and occasionally heavy, perhaps thundery, showers through the evening. Southwesterly breeze.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Heavy morning showers, cloudier afternoon with some snow. Strengthening northeasterly winds.
| 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) |
40% | 30% | 30% | 20% | 30% | 50% | 70% | 50% |
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 |
SW
12
|
S
10
|
SE
10
|
E
11
|
NE
17
|
NE
22
|
NE
24
|
N
20
|
| 300m |
SW
7
|
S
4
|
E
3
|
E
8
|
NE
13
|
NE
13
|
NE
13
|
N
12
|
| Valley |
SW
6
|
SE
3
|
E
3
|
E
7
|
NE
11
|
NE
11
|
NE
12
|
N
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 | 16 | 15 | 13 | 16 | 24 | 31 | 33 | 29 |
| 300m | 16 | 12 | 8 | 14 | 24 | 26 | 27 | 24 |
| Valley | 16 | 8 | 7 | 13 | 22 | 24 | 26 | 24 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
2°
|
2°
|
1°
|
0°
|
-1°
|
-2°
|
| 300m |
5°
|
5°
|
4°
|
4°
|
3°
|
2°
|
2°
|
1°
|
| Valley |
6°
|
5°
|
4°
|
5°
|
4°
|
3°
|
3°
|
2°
|
| Freezing Level |
1,000m
|
1,000m
|
1,000m
|
800m
|
700m
|
500m
|
400m
|
400m
|
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°
|
-2°
|
-2°
|
-5°
|
-7°
|
-8°
|
-9°
|
| 300m |
3°
|
3°
|
2°
|
1°
|
-2°
|
-3°
|
-4°
|
-4°
|
| Valley |
4°
|
4°
|
3°
|
2°
|
0°
|
0°
|
-2°
|
-2°
|
Additional weather information
Meteorologist's view
Turning colder through the day, gusts around 40mph over ridges and summits in the late afternoon.
Weather
Clear spells and occasionally heavy, perhaps thundery showers through the early hours. The showers become fewer and further between through the morning and turn increasingly wintry above about 600m. During the afternoon more persistent, mainly light, snow will edge south. The snow will clear south through the late evening with clear spells developing.
Chance of cloud-free hill tops
Around 60% through the morning becoming near zero by mid-afternoon. Chances improve again later in the evening.
Low cloud and visibility
Occasional or periods of cloud 450-600m, becoming more persistent through the afternoon. Away from cloud visibility good or very good falling to a few kilometres in heavier showers and snow.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 4.6mm | 18.2mm | 23.8mm |
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
Any remaining snow clearing south soon after midnight, then dry with some long clear spells developing. Then a dry and sunny day, although the sunshine will turn hazy through the afternoon as cloud above the summits increases. Cloud thickens through the evening with outbreaks of rain, preceded by snow above about 450m, spreading east towards midnight.
Chance of cloud-free hill tops
100% through daylight hours, but falling through the evening.
Maximum wind speed expected
Northerly 10-15mph becoming Variable 10mph or less, then Southerly 15 to 20mph through the afternoon, then increasing 25-30mph through the evening, with gusts around 45mph over ridges and summits.
Temperature
- At 600m Around minus 3 Celsius rising to zero Celsius
- Valley Around minus 1 or 2 Celsius at dawn rising to plus 4 or 5 Celsius through the day
- Freezing level 300m or less rising to 600m
Low cloud and visibility
Very good or excellent with good panoramic views of surrounding mountains, falling to just a few kilometres in evening rain and snow.
Mountain weather information
Sun 15 Feb
Sunrise:
Sunset:
Cloudy with occasionally heavy rain, preceded briefly by snow, clearing east by early afternoon then sunny spells and showers, wintry on highest summits. Strong southerly winds veering southwesterly and easing. Freezing level rising above the summits.
Mon 16 Feb
Sunrise:
Sunset:
Mostly cloudy with showers or longer spells of occasionally heavy rain, perhaps some snow on higher summits. Fresh southwesterly winds turning northerly and strengthening. Freezing level 750m-1000m.
Tue 17 Feb
Sunrise:
Sunset:
Mainly dry with sunny spells, risk of evening rain. Strong northerly winds easing, freshening easterly winds later. Freezing level around 750m, rising 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.