Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for overall theme, but more uncertain on timing and intensity of the rain on Wednesday morning.
This evening forecast
Plenty of low cloud and outbreaks of rain. Starting light but turning heavy and more persistent through the evening. Winds mostly light be gusty of higher peaks.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
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.
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.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Cloudy with heavy rain through the morning. Turning drier with sunny spells in the afternoon, plus the risk of showers to start but turning drier.
| 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% | 40% | 30% | 30% | 70% | 30% | 10% | 20% |
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 |
S
17
|
S
19
|
S
20
|
S
28
|
SW
25
|
SW
28
|
SW
24
|
SW
24
|
| 300m |
S
8
|
S
10
|
S
10
|
S
15
|
SW
15
|
SW
19
|
SW
15
|
SW
14
|
| Valley |
S
6
|
S
8
|
S
7
|
S
11
|
SW
12
|
SW
17
|
SW
13
|
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 | 22 | 25 | 26 | 37 | 33 | 38 | 33 | 33 |
| 300m | 19 | 23 | 22 | 32 | 30 | 36 | 29 | 28 |
| Valley | 16 | 21 | 19 | 26 | 27 | 35 | 28 | 26 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
9°
|
9°
|
8°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| 300m |
10°
|
11°
|
10°
|
11°
|
11°
|
12°
|
10°
|
8°
|
| Valley |
11°
|
11°
|
11°
|
12°
|
12°
|
12°
|
10°
|
9°
|
| Freezing Level |
2,300m
|
2,100m
|
2,000m
|
2,000m
|
1,800m
|
1,400m
|
1,400m
|
1,400m
|
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°
|
4°
|
4°
|
4°
|
3°
|
2°
|
1°
|
| 300m |
9°
|
8°
|
8°
|
9°
|
8°
|
8°
|
6°
|
5°
|
| Valley |
10°
|
10°
|
9°
|
10°
|
9°
|
9°
|
8°
|
6°
|
Additional weather information
Meteorologist's view
Rain will turns very heavy through the morning so thick waterproofs are required as well as sturdy footwear.
Weather
Plenty of low cloud through the morning will hill fog, light rain and drizzle. Rain turns a lot heavier by the late morning but clearing in the early afternoon where winds will turn more gust. Showers develop behind heavy rain but turning drier with sunny spells. Some patchy cloud remains.
Chance of cloud-free hill tops
10% during the morning, lifting to 60% but the mid-afternoon.
Low cloud and visibility
Cloud bases around 100-200m, but lifting through the day improving visibility.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.8mm | 2mm | 28mm |
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
Cloudy with showers during the morning with gusty winds on the higher peaks. Cloud will lift through the morning into hazy brighter spells. Showers become more isolated and ease by midday. Winds become lighter into the afternoon and evening.
Chance of cloud-free hill tops
40% but lifting through the afternoon to 80%.
Maximum wind speed expected
25-30 mph.
Temperature
- At 600m Plus 6 Celsius, rising to plus 9 Celsius.
- Valley Plus 10 Celsius, rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud can be as low as 200m-400m in the morning but lifting and clearing into the afternoon to improve visibility.
Mountain weather information
Fri 17 Apr
Sunrise:
Sunset:
Sunshine and showers. Feeling warm in the sunshine. Light southwesterly winds. Freezing level above summits.
Sat 18 Apr
Sunrise:
Sunset:
Mostly dry and bright with a risk of rain later. Light southerly winds.
Sun 19 Apr
Sunrise:
Sunset:
A cloudy start but lifting to sunshine and showers.
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.