Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Moderate confidence for Monday, and low for timings of rain. High for low cloud and strong winds Tuesday, but low for rain amounts. Generally lower confidence from Wednesday with large uncertainty in position of fronts.
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.
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.
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.
Mountain weather forecast
Rain and heavy showers with a risk of lightning.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 30% | 80% | 60% | 40% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
S
19
|
S
17
|
S
16
|
SW
15
|
SW
15
|
SW
15
|
| 300m |
SW
8
|
S
7
|
S
8
|
SW
7
|
SW
8
|
SW
9
|
| Valley |
SW
7
|
S
5
|
S
6
|
SW
7
|
SW
6
|
SW
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 24 | 21 | 20 | 20 | 21 | 22 |
| 300m | 19 | 16 | 17 | 16 | 19 | 20 |
| Valley | 19 | 13 | 15 | 17 | 17 | 18 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
7°
|
8°
|
7°
|
6°
|
6°
|
| 300m |
9°
|
9°
|
10°
|
9°
|
8°
|
7°
|
| Valley |
9°
|
10°
|
11°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,400m
|
1,600m
|
1,600m
|
1,500m
|
1,400m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
3°
|
4°
|
3°
|
2°
|
2°
|
| 300m |
7°
|
8°
|
8°
|
7°
|
5°
|
5°
|
| Valley |
8°
|
8°
|
10°
|
8°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
Some uncertainty in timing of rain and its clearance. Stronger gusts likely near heavy showers. Feeling chilly in the wind on higher slopes.
Weather
Likely a mostly dry start with bright spells but the risk of a shower. Outbreaks of rain and showers spread north in the morning, heavy for a time with a low risk of thunder. Showers become much more isolated from mid to late afternoon, but the risk continues through the evening.
Chance of cloud-free hill tops
40%.
Low cloud and visibility
Areas of cloud, base 400-600m, at times throughout the day. Perhaps becoming more persistent late morning to early afternoon in association with heavy showers. Visibility poor in rain or heavy showers and very poor in low cloud covering the hills, otherwise good.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 8.2mm | 8.4mm | 10.4mm |
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
Outbreaks of rain arriving during the early hours, quickly turning heavy with gales developing over the tops. Heavy rain is likely to ease through the morning, but drizzle, low cloud and gales persisting, with a chance of some heavier outbreaks of rain. Further persistent heavy rain in the evening.
Chance of cloud-free hill tops
Nil
Maximum wind speed expected
Increasing to South 30-35 mph gusting 45-50 mph in the afternoon and evening.
Temperature
- At 600m Plus 6 Celsius rising to 10 Celsius.
- Valley Plus 7 Celsius rising to 11 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Poor or very poor visibility throughout the day in rain, drizzle and persistent extensive cloud, bases down to 400m, often lower slopes on southerly aspects.
Mountain weather information
Wed 12 Nov
Sunrise:
Sunset:
Further outbreaks of rain, likely to be persistent for several hours, but winds easing. Rain is likely to clear north later in the day with a few showers remaining. Freezing level above summits.
Thu 13 Nov
Sunrise:
Sunset:
A lot of uncertainty in the position of rain bands. Currently looks most likely to be bright spells, a few showers and mostly light winds. However a chance of persistent rain. Freezing level above summits.
Fri 14 Nov
Sunrise:
Sunset:
Continuing large uncertainty around position of rain bands, although currently looking likely to be persistent rain and strong easterly winds for much of the day. Freezing level likely to be above 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.