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
Check the live Tonight score, best clear window, and next ISS pass on this page, then open a tool with coordinates prefilled.
Learn: Is tonight good for stargazing? · How to see the Milky Way