Autumn Equinox 2024. H ere are five things to know about the fall, or autumnal, equinox: A carefully worded answer is that on sunday, sept.

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. This sunday, the autumnal equinox is upon us, and with it, a shift to shorter days, longer nights and the astronomical start of fall in the northern hemisphere.