Autumnal Equinox 2024. 22, day and night will be nearly equal in length as earth. Cdt) on september 22, 2024.

Normally, the autumn equinox falls between 22 and 24 september, and this year the equinox occurs on 22 september at 13:44 bst. According to the astronomical definition, fall begins with the autumnal equinox.