Autumn Equinox 2024 Southern Hemisphere. In the northern hemisphere, the autumnal equinox takes place on september 22, 2024, at 12:44 gmt (08:44 a.m. December 21, 2024 at 1:20 am pst.

Autumn equinox 2024 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,. Also known as bealtaine, walpurgisnacht, may day, (northern hemisphere) & novey eve (in southern hemisphere).