Mexico City’s altitude helps seeing, but valley smog and light drown faint targets from the centre. Clear winter nights over nearby volcanoes open rich tropical Milky Way views.
Dry season (Nov–Apr) is the practical observing calendar.
Mexico · Valley of Mexico · ~19.4°N
Tonight is 22 Oct, times in America/Mexico_City (CST), computed with astronomy-engine for 19.43° N, 99.13° W. Climate: NASA POWER monthly means, 2001-2020, cloud and rain averaged over the whole day.
Check the live Tonight score for Mexico City (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 Mexico City runs from 4:05 AM to 5:20 AM (CST). This hub also shows moonrise, moonset and illumination; open Dark Sky Window for the full ephemeris card.
Tonight (22 Oct) astronomical darkness in Mexico City runs from 7:22 PM to 5:20 AM (CST). 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.