Autumn Equinox 2024 Date. In the southern hemisphere the equinox. The autumnal equinox brings fall to the northern hemisphere today as the sun passes directly over the equator at noon.

When is the autumn equinox? Autumn 2024 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth’s axis.