Hilo’s windward rain often yields to clearer Mauna Kea and saddle-road elevations just inland. Near-tropical latitude keeps both northern and southern deep-sky targets in play year-round.
Trade-wind cloud caps the summits while the coast stays socked in — check altitude.
United States · Hawaiʻi Island · windward
Tonight is 22 Oct, times in Pacific/Honolulu (HST), computed with astronomy-engine for 19.71° N, 155.09° W. Climate: NASA POWER monthly means, 2001-2020, cloud and rain averaged over the whole day.
Check the live Tonight score for Hilo (cloud, dew, transparency, and astronomical dark), then read the hourly cloud timing chart and moonless dark window on this page.
Use the best clear window clock times after astronomical darkness, and prefer moonless hours when deep-sky contrast matters.
Tonight (22 Oct) the moonless dark window in Hilo runs from 3:57 AM to 5:04 AM (HST). This hub also shows moonrise, moonset and illumination; open Dark Sky Window for the full ephemeris card.
Tonight (22 Oct) astronomical darkness in Hilo runs from 7:06 PM to 5:04 AM (HST). This hub lists sunset, civil, nautical and astronomical dusk and the matching dawn times, plus when the Moon and planets are highest. Astronomical darkness starts when the Sun is 18° below the horizon.
ISS passes are spottable near dusk or dawn when the sky is dark and the station is still sunlit. This page lists the next spottable pass when available.