About this tool: Eight of Hawaiʻi’s best stargazing locations scored live for tonight and the next seven nights. The score combines cloud cover (the biggest single factor), moon illumination (a full moon washes out the deep sky), nighttime humidity, and each site’s Bortle darkness class. Mauna Kea Summit and Mauna Loa Observatory Road are Bortle 1 — among the darkest accessible skies on Earth — while sea-level options like Polihale and South Point are Bortle 2-3 but reachable without altitude planning.