Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall, lower for shower detail.
This evening forecast
Heavy showers easing and clearing, with clear spells developing. Turning cloudier by midnight.
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.
Mountain weather forecast
Cloudy but dry at first, patchy rain spreading eastwards during the afternoon.
| 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) |
20% | 20% | 10% | 10% | 20% | 60% | 40% | 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 |
SW
16
|
W
14
|
W
14
|
W
15
|
W
15
|
W
16
|
W
13
|
W
9
|
| 300m |
SW
10
|
W
9
|
W
8
|
W
11
|
W
11
|
W
12
|
W
9
|
W
5
|
| Valley |
SW
8
|
W
8
|
W
7
|
W
10
|
W
10
|
W
11
|
W
8
|
W
5
|
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 | 19 | 18 | 20 | 21 | 22 | 18 | 14 |
| 300m | 21 | 18 | 15 | 19 | 21 | 21 | 16 | 13 |
| Valley | 20 | 18 | 15 | 19 | 20 | 21 | 16 | 12 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
10°
|
10°
|
10°
|
12°
|
13°
|
12°
|
12°
|
12°
|
| 300m |
12°
|
12°
|
12°
|
15°
|
17°
|
15°
|
15°
|
14°
|
| Valley |
12°
|
13°
|
13°
|
16°
|
17°
|
16°
|
16°
|
14°
|
| Freezing Level |
2,200m
|
2,200m
|
2,100m
|
1,900m
|
2,100m
|
2,600m
|
2,700m
|
2,600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
7°
|
7°
|
9°
|
10°
|
10°
|
10°
|
10°
|
| 300m |
10°
|
10°
|
11°
|
13°
|
14°
|
13°
|
14°
|
13°
|
| Valley |
11°
|
11°
|
12°
|
14°
|
15°
|
14°
|
14°
|
14°
|
Additional weather information
Meteorologist's view
A changeable say, so light, removable, waterproof layers are recommended. The sun may feel warm during sunny spells through the morning, however patchy rain arriving from the west later may be persistent with cloud giving damp conditions. Note the sun is strong this time of year giving high or very high UV levels, skin protection is advised.
Weather
Cloudy through the early hours with low cloud lingering as hill fog across the tops. Soon becoming brighter after dawn with cloud lifting and breaking, allowing some sunshine to break through. Turning cloudier into the afternoon once more with patchy rain and drizzle spreading in from the west.
Chance of cloud-free hill tops
20% first thing, increasing to 90% or more for a time shortly after dawn, then decreasing to 50% later in the afternoon.
Low cloud and visibility
Very poor visibility with widespread low cloud bringing hill fog across the tops through the early hours, bases 300-500m. Improving to good or very good shortly after dawn with bases above the summits for a time. Excellent air quality gives far-reaching views of distant peaks. Cloud thickening from the west through the later afternoon sees cloud bases returning to 400-600m, with visibility dropping to moderate or poor in outbreaks of rain and drizzle.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 16.6mm | 22.6mm | 34mm |
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
A mainly dry and fine day with any early mist and hill fog soon lifting and clearing. Plenty of warm sunshine to follow through the day, though note UV levels will be high or very high.
Chance of cloud-free hill tops
40% soon increasing to 90% or more.
Maximum wind speed expected
Westerly 20-25mph.
Temperature
- At 600m Plus 9 Celsius becoming plus 15 Celsius.
- Valley Plus 12 Celsius becoming plus 21 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Some early mist and hill fog giving very poor visibility with low cloud bases around 300-500m. Soon becoming brighter with bases above the summits, and visibility improving to very good, with excellent air quality giving far-reaching views of distant peaks.
Mountain weather information
Tue 17 Jun
Sunrise:
Sunset:
A mixture of warm sunshine and cloudier periods, but mainly staying dry. High or very high UV levels. Moderate westerly winds. Freezing level above the summits.
Wed 18 Jun
Sunrise:
Sunset:
Bright and sunny with largely clear skies. Feeling warm, especially in sheltered spots, though moderate to fresh southwesterlies may take the edge off the temperatures. High or very high UV levels.
Thu 19 Jun
Sunrise:
Sunset:
Another warm and dry day, though with slightly cloudier skies. High or very high UV levels. Moderate southerly or southwesterly winds. Freezing level above the summits.
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.