Bannau Brycheiniog (Brecon Beacons)
A poor day on the tops in Bannau Brycheiniog (Brecon Beacons), with burns in severe spate and strong, gusty winds.
Sunshine and sky
Extensive cloud. Cloud is likely to remain extensive for much of the day.
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 southerly wind of 30–40 mph, gusting 40–50 mph, picking up through the day. Gusts like that are strong enough to knock you off balance, so take care near edges and on narrow ridges.
Walking impact
Gusts of 40–50 mph are strong enough to knock you off balance, so take care near edges and on narrow ridges.
Spate risk
Severe spate risk based on 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
Rain for much of the day, becoming heavier later. Expect 20–40 mm in total. Rain is forecast in parts of the area during the afternoon, but its extent and local amounts are uncertain.
Cloud-free summits
Clear-summit estimate: about 25% early, about 15% around midday and about 15% later.
Cloud and visibility
Expect many summits to be in cloud for most of the day. The cloud base lowers through the day. The cloud base could be as low as 600–700 m around midday. 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.
Temperature and wind chill
At around 700 m it will be 2 to 6°C, feeling like -6 to -2°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 07:42, Sunset 16:15, about 8.6 hours daylight.
Overnight · 17:00–08:00Wild campingBetaNot a night to camp on the open hill anywhere in this area: gusts of about 50 mph and around 12 mm of rain. 9Poor · 600 m View detailsHide details
Full regional overnight outlook
Not a night to camp on the open hill anywhere in this area. Gusts reach about 50 mph on open ground, enough to damage a tent on open ground. Check the forecast for the hill and height you have in mind, and don't assume lower ground will be sheltered. About 12 mm of rain is forecast overnight. Overnight lows of about 5°C at 300 m.
Moon overnight
Waxing gibbous moon
- Illuminated disc
- 91%
- Moonrise
- Outside this window
- Moonset
- 04:58 next morning GMT
Cloud and terrain vary across the area. Illumination describes the sunlit part of the Moon, not brightness at your pitch.
Overnight window: 21 Nov, 17:00 GMT to 22 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
- 22 mph / 40 mph
- Coldest
- 5.3°C
- In cloud
- 0% of modelled night
- Condensation
- High
- Wind / gust
- 27 mph / 48 mph
- Coldest
- 5.3°C
- In cloud
- 3% of modelled night
- Condensation
- High
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 50 mph may affect balance on exposed rock. 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 50 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.
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 15 November 2026 at 16:26 UTC. See typical weekly and monthly conditions for Bannau Brycheiniog (Brecon Beacons).