Fall Equinox 2024 Southern Hemisphere. The fall equinox in 2023 is an important celestial event that marks the first day of autumn for the northern hemisphere. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
Edt on march 19 (03:06 utc on march 20) in the northern hemisphere. It also lists astronomical sunrise and sunset timings on autumnal.