Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a showery Sunday but moderate in terms of details. High for a change to more settled weather early next week but low for any thundery breakdown later in the week.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Mountain weather forecast
Sunny spells and showers.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 50% | 70% | 40% | 30% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
W
19
|
W
19
|
W
18
|
W
22
|
W
19
|
SW
15
|
| 300m |
W
10
|
W
10
|
W
11
|
W
15
|
W
13
|
SW
9
|
| Valley |
W
10
|
W
10
|
W
10
|
W
13
|
W
12
|
W
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 24 | 24 | 24 | 30 | 26 | 20 |
| 300m | 21 | 20 | 21 | 28 | 23 | 19 |
| Valley | 21 | 20 | 21 | 27 | 25 | 18 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
8°
|
9°
|
10°
|
10°
|
9°
|
| 300m |
8°
|
11°
|
12°
|
13°
|
12°
|
11°
|
| Valley |
9°
|
12°
|
13°
|
14°
|
13°
|
12°
|
| Freezing Level |
1,200m
|
1,600m
|
1,800m
|
1,800m
|
2,000m
|
1,900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
1°
|
4°
|
6°
|
6°
|
6°
|
5°
|
| 300m |
5°
|
8°
|
10°
|
10°
|
10°
|
9°
|
| Valley |
6°
|
10°
|
11°
|
11°
|
11°
|
10°
|
Additional weather information
Meteorologist's view
Starting fine and dry with some good hill-walking conditions at first. Some showers will develop later on, and with the cool temperatures and winds at the summits wind chill may be a factor. So additional layers of warm and waterproof clothing is advised for those heading into the hills. Further sunny spells in the afternoon and evening will result in a high UV risk so appropriate sun protection is advised.
Weather
A dry and bright start, but turning cloudy from the west with showers developing, these locally heavy at times. Showers fading during the afternoon with some sunny spells likely for the evening.
Chance of cloud-free hill tops
60% rising to 80% from late morning.
Low cloud and visibility
Cloud bases mostly above the level of the summits throughout the day, however developing showers from early morning will allow cloud bases to drop towards 700 meters at times. Often very good visibility with excellent air clarity but briefly falling to 8-15km as showers pass through. Occasionally poor or very poor in cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 5.6mm | 10.2mm | 26.8mm |
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
Often cloudy but with some bright or sunny spells through the morning. Thickening cloud arriving from the west during the afternoon, perhaps with some drizzle after dark. Strengthening southwesterly winds in the evening.
Chance of cloud-free hill tops
40% rising to 70% during the morning, but reducing to 30% from late afternoon.
Maximum wind speed expected
Southwesterly means of 10-15 mph, gusting to 25-30 mph during the afternoon.
Temperature
- At 600m Plus 7 Celsius rising to plus 12 Celsius.
- Valley Plus 6 Celsius rising to plus 18 Celsius.
- Freezing level Above the summits
Low cloud and visibility
Cloud banks on western slops at first, with bases around 700 meters, however cloud lifting above the level of the summits for much of the day. Cloud bases lowering significantly to 400-500 meters from late afternoon. Often very good visibility with excellent air clarity but briefly falling to 8-15km as showers pass through. Occasionally poor or very poor in cloud.
Mountain weather information
Tue 10 Jun
Sunrise:
Sunset:
Another mainly dry day with mostly cloudy skies, but also some sunny spells. Moderate to fresh westerly winds. Freezing levels above the level of the summits.
Wed 11 Jun
Sunrise:
Sunset:
Fine and very warm with sunny periods but a chance of heavy showers or thunderstorms overnight. Moderate to fresh southerly winds.
Thu 12 Jun
Sunrise:
Sunset:
A mixture of sunny spells and showers, these locally heavy and thundery. Rather breezy, but feeling warm, if not very warm, especially in any sunnier breaks.
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.