Autumnal Equinox Day 2024 Calendar. Autumn equinox 2024 occurs sunday 22 september at 12:44pm (13:44 utc), as this is when the centre of the sun crosses the celestial equator. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
In other words, on the day of the. The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd.
