Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a generally dry and settled week. Moderate for strength of winds on Tuesday and Wednesday.
This evening forecast
Dry on Monday evening with some evening sunny spells.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
Mountain weather forecast
Increasingly windy but otherwise becoming fine with sunny spells.
| 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% | 20% | 10% | <05% | <05% | 00% | 00% |
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
12
|
E
15
|
NE
16
|
E
20
|
E
20
|
E
21
|
E
21
|
E
22
|
| 300m |
E
5
|
E
6
|
NE
9
|
E
13
|
E
14
|
E
14
|
E
13
|
E
12
|
| Valley |
E
4
|
E
4
|
NE
9
|
E
12
|
E
13
|
E
13
|
E
12
|
E
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 | 21 | 22 | 22 | 27 | 27 | 30 | 29 | 33 |
| 300m | 15 | 16 | 19 | 24 | 26 | 27 | 27 | 27 |
| Valley | 12 | 15 | 20 | 24 | 25 | 27 | 26 | 27 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
2°
|
2°
|
4°
|
6°
|
8°
|
8°
|
5°
|
| 300m |
4°
|
4°
|
4°
|
7°
|
10°
|
11°
|
10°
|
7°
|
| Valley |
4°
|
4°
|
5°
|
8°
|
11°
|
12°
|
12°
|
8°
|
| Freezing Level |
1,000m
|
900m
|
900m
|
900m
|
1,100m
|
1,300m
|
1,300m
|
900m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
-3°
|
-3°
|
-2°
|
1°
|
4°
|
4°
|
-1°
|
| 300m |
2°
|
1°
|
1°
|
3°
|
6°
|
8°
|
8°
|
3°
|
| Valley |
2°
|
2°
|
2°
|
5°
|
8°
|
9°
|
9°
|
5°
|
Additional weather information
Meteorologist's view
Winds steadily strengthening through the day giving considerable buffeting on summits by late afternoon. Gusts of up to 40 mph are possible on the highest summits and in some cols. Despite the strong April sunshine providing some warmth, the winds will make it feel close to freezing on the highest summits, so extra layers are recommended.
Weather
Often cloudy through the early hours but clear spells are likely too. Cloud amounts reducing through the morning to leave increasingly prolonged sunny spells by Tuesday afternoon. Some high cloud may give a hazier look to the sunshine at times. Turning increasingly windy but feeling warm where sheltered from the easterly wind.
Chance of cloud-free hill tops
40% becoming 95%.
Low cloud and visibility
Periods of cloud above 500-700m until mid-morning, steadily lifting and becoming patches above 800m by mid-morning and clearing all summits by noon. Visibility will be very poor in cloud/hill fog but otherwise expect very good visibility albeit with a slight haze making faraway landmarks somewhat fuzzy to see.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 1.6mm |
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
Windy with near gale-force winds on the summits. Another fine and largely sunny day is in store, albeit with the sunshine turning increasingly weak and hazy. Feeling cold on the summits, especially early and late in the day.
Chance of cloud-free hill tops
70% becoming 100% by mid-morning.
Maximum wind speed expected
Easterly 35-45 mph.
Temperature
- At 600m Plus 3 Celsius rising to plus 13 Celsius.
- Valley Plus 3 Celsius rising to plus 18 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Banks of cloud between 500m and 700m may affect east facing slopes in the east of the National Park, this soon dispersing to leave all summits cloud free by mid-morning. Visibility will be very poor in cloud/hill fog but otherwise expect very good visibility albeit with a slight haze making faraway landmarks somewhat fuzzy to see.
Mountain weather information
Thu 23 Apr
Sunrise:
Sunset:
Patchy cloud clearing to leave a sunny day. Winds easing very slightly but staying moderate to fresh easterly. Freezing level above summits. UV levels becoming high for a time.
Fri 24 Apr
Sunrise:
Sunset:
A similar day ahead with patchy cloud clearing to leave a sunny day. Lighter winds than previous days, generally light to moderate easterly. Feeling warmer with freezing level above summits.
Sat 25 Apr
Sunrise:
Sunset:
Staying similar with light to moderate easterly winds and mostly sunny and warm once any valley mist and fog has cleared. A small chance of an afternoon shower. 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.