Bannau Brycheiniog stargazing forecast — Saturday, August 15

South Wales · Bortle 3 · 51.880, -3.440 · Snapshot generated Sat, 15 Aug 2026 02:05:08 GMT

Fair (Medium confidence)

Short 3h window, otherwise mean cloud 70%. Worth a look if you're nearby.

Best observing window tonight

Sat 10:00 p.m. – Sun 12:00 a.m. (3h, 0% mean cloud)

Astronomical night: Sat 9:37 p.m. → Sun 7:00 a.m.
Moon: Waxing crescent · 7% illuminated
Mean cloud (during night): 70% (min 0%)

Site

Bannau Brycheiniog (Brecon Beacons) is a Welsh Dark Sky Reserve where sandstone uplands and reservoirs sit 90 minutes from Cardiff and Bristol. Usk Reservoir and Carreg Cennen are dependable dark-sky pull-offs.

Drive from Toronto: ≈ 1 h from Cardiff or 1.5 h from Bristol via the A470.

Best time of year: October–March around new moon.

Open the live 48-hour forecast →

Citations & data sources

Open-Meteo Forecast API (cloud, humidity, wind, visibility)
Open-Meteo astronomical data (sunrise, sunset, moon)
Bortle scale reference for site darkness
Editorial guide for Bannau Brycheiniog: /sites/bannau-brycheiniog-dsr.txt
Structured site data: /sites/bannau-brycheiniog-dsr.json
Live MCP server (AI agents): https://koohxdehsweadgdegrly.supabase.co/functions/v1/mcp

This is a build-time snapshot — the live forecast at https://ontarionightsky.com/?site=bannau-brycheiniog-dsr updates continuously.