Bannau Brycheiniog (Brecon Beacons)
A poor day on the tops in Bannau Brycheiniog (Brecon Beacons), with burns likely to be in spate and a blustery wind.
Sunshine and sky
Sunshine varies by period. Sunshine amounts vary between the morning, midday and later periods.
These are direct modelled sunshine hours during daylight, not the probability of sunshine. Cloud cover and summit cloud are assessed separately in the forecast above. The regional median prevents one unusually bright or dull summit cell defining the whole area.
Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.
High-ground wind (700 m)
At around 700 m, expect a westerly wind of 25–35 mph, gusting 35–45 mph. Gusts like that are strong enough to make walking into it hard work, with buffeting on ridges and edges.
Walking impact
Gusts of 35–45 mph are strong enough to make walking into it hard work, with buffeting on ridges and edges.
Thunderstorms
There is a small chance of a thunderstorm from the morning into the afternoon. If you hear thunder, head down off the tops and away from ridges. If a thunderstorm develops, sudden gusts and heavy rain can change conditions quickly.
Ground conditions
The ground is likely to be wet after recent rain.
Spate risk
High spate risk based on recent and forecast rainfall. Burns and unbridged crossings may become difficult or impassable. Timing and severity can vary between catchments. Check the peak forecast for the separate rain/runoff periods. Turn back if a crossing looks unsafe.
Rain and showers
Drizzle for much of the day. Expect 2–5 mm in total. Rain is possible during the morning, but forecast models disagree on whether it will fall. Rain is forecast in parts of the area during the afternoon, but its extent and local amounts are uncertain. Visibility may drop briefly in showers in parts of the area.
Cloud-free summits
Clear-summit estimate: about 65% early, about 30% around midday and about 25% later.
Cloud and visibility
The tops are likely to drift in and out of cloud, with the best chance of clear tops early on. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass. Some forecast models are much cloudier overhead. That may limit sunshine without putting the summits in cloud. Mist or fog is possible in some valleys early on.
Temperature and wind chill
At around 700 m it will be 4 to 8°C, feeling like -4 to 0°C in the wind. Take a hat, gloves, a windproof and a spare warm layer. Pack waterproofs too, and keep a warm layer dry in your pack.
Freezing level
The freezing level is above the summits.
Daylight
Sunrise 07:36, Sunset 16:20, about 8.8 hours daylight.
Overnight · 17:00–08:00Wild campingBetaToo windy for an exposed pitch around 900 m on some hills (gusts of about 35 mph). Lower down, a mixed night to camp, mainly because of the wind. 39Poor · 600 m View detailsHide details
Full regional overnight outlook
Too windy for an exposed pitch around 900 m on some hills. Lower down, a mixed night to camp, mainly because of the wind. Gusts reach about 35 mph on open ground, which makes for a noisy, testing night even in a good tent. Check the forecast for the hill and height you have in mind, and don't assume lower ground will be sheltered. A little rain is forecast overnight. Overnight lows of about 6°C at 600 m.
Moon overnight
Waxing gibbous moon
- Illuminated disc
- 55%
- Moonrise
- Outside this window
- Moonset
- 23:42 GMT
Cloud and terrain vary across the area. Illumination describes the sunlit part of the Moon, not brightness at your pitch.
Overnight window: 17 Nov, 17:00 GMT to 18 Nov, 08:00 GMT. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.
Representative location: 51.884, -3.437. Times vary across the area.
Elevation reference (open ground)
- Wind / gust
- 17 mph / 30 mph
- Coldest
- 7.3°C
- In cloud
- 0% of modelled night
- Condensation
- Moderate
- Wind / gust
- 21 mph / 36 mph
- Coldest
- 5.5°C
- In cloud
- 13% of modelled night
- Condensation
- Moderate
Open-hillside guidance across representative hills. Local shelter, ridges, tent design and the exact pitch can change conditions substantially. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 40 mph may affect balance on exposed rock. A small chance of a thunderstorm in parts of the area. Avoid exposed scrambling if storms develop. 0Poor · Very poor View detailsHide details
Regional climbing & scrambling outlook
A broad guide to dampness and exposed rock across the area, not a forecast for every crag. Lower, sheltered crags and individual rock types may behave differently.
Conditions for exposed scrambling across the area look very poor (0/100). Rain is likely to leave rock wet. Polished slabs, vegetation and drainage lines may be notably worse. Gusts may reach about 40 mph on exposed ground, making crosswinds an important route consideration. Mapped summit-point geology across the representative hills includes sandstone or gritstone. Rock can therefore respond differently to moisture between crags and routes. A small chance of a thunderstorm in parts of the area. Storm timing is uncertain, so avoid committing to exposed rock if storms may develop.
Representative summit-point samples across the region; individual crags and routes may differ.
Generic exposed hands-on-rock terrain across representative summits; mapped summit-point geology is a broad regional sample, not a named-route survey. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.
Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit
For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.
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Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
Updated 14 November 2026 at 16:37 UTC. See typical weekly and monthly conditions for Bannau Brycheiniog (Brecon Beacons).