São Paulo’s megacity glow pushes astronomy toward Serra da Mantiqueira and coastal ranges. Humid subtropical nights reward patience — post-frontal dry air is when faint structure appears.
Summer thunderstorms often clear into sharp late-night windows.
Brazil · Southeast Brazil · ~23.6°S
Tonight is 22 Oct, times in America/Sao_Paulo (GMT-3), computed with astronomy-engine for 23.55° S, 46.63° W. Climate: NASA POWER monthly means, 2001-2020, cloud and rain averaged over the whole day.
Check the live Tonight score for São Paulo (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 São Paulo runs from 3:30 AM to 4:09 AM (GMT-3). This hub also shows moonrise, moonset and illumination; open Dark Sky Window for the full ephemeris card.
Tonight (22 Oct) astronomical darkness in São Paulo runs from 7:33 PM to 4:09 AM (GMT-3). 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.