Fall Equinox 2024 Date 4. In the southern hemisphere, the autumnal equinox takes place on march 20, 2024, at 03:07 gmt (march 19, 11:07 p.m. Summer starts at the moment when the sun is farthest north:

In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. In the southern hemisphere, the autumnal equinox takes place on march 20, 2024, at 03:07 gmt (march 19, 11:07 p.m.