When Is Autumn 2024 In Usa Time. The first day of autumn often called fall (september equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing. Sunday, sep 22 8:43 am edt.

Print date calendar for the autumn 2024. America the exact moment of the autumnal equinox in 2024 is 22 september, at 14:43:12.