Autumnal Equinox Day 2024 Lok. On this day, days and nights are approximately (but not exactly) equal in length for everyone across. September 22 is the autumnal equinox for 2024, marking the earliest start to the fall season for the northern hemisphere since 1796.
This year, the autumn equinox will begin on sunday, september 22, 2024, at 12:44 utc (7:44 a.m. The autumnal equinox (as well as spring equinox) is the moment when neither of the earthโs hemispheres is inclined towards or away from the sun.