Fall Equinox 2024 Southern Hemisphere. In the southern hemisphere, it will occur on march 20, 2025, at 09:02 gmt (05:02. In the northern hemisphere the autumnal equinox falls about september 22 or 23, as the sun crosses the celestial equator going south.

The autumnal equinox brings fall to the northern hemisphere today as the sun passes directly over the equator at noon. The autumnal equinox occurs in september each year, and in the northern hemisphere the date marks the end of summer and beginning of autumn.