Autumn Equinox Southern Hemisphere 2024 Dates And Time. In the northern hemisphere the autumnal equinox falls about september 22 or 23, as the sun crosses the celestial equator going south. The fall equinox and the first day of autumn arrives on sunday, september 22, 2024, at 08:44 a.m.

Edt, marks the passage of direct sunlight over the equator from the northern hemisphere to the. When is the 2024 fall equinox?