Isle Royale stargazing forecast — Friday, August 14

Best observing window tonight

Fri 6:00 p.m. – Fri 7:00 p.m. (2h, 14% mean cloud)

Astronomical night

Fri 5:10 p.m. → Sat 2:51 a.m.

Moon

New moon · 2% illuminated

Mean cloud (during night)

54%   (min 1%)

Site

Isle Royale is an island wilderness in Lake Superior reachable only by ferry, seaplane, or private boat — no cars, no roads, and almost no artificial light. That isolation gives it Bortle Class 2 skies over open water horizons.

Drive from Toronto: Reached by ferry from Houghton or Copper Harbor, MI, or Grand Portage, MN — there is no road access.

Best time of year: The park is open roughly mid-April through October; late-season visits (September) combine dark nights with aurora chances.

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 Isle Royale: /sites/isle-royale-np.txt
• Structured site data: /sites/isle-royale-np.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=isle-royale-np updates continuously.