Autumnal Equinox 2024 Date. When is the autumnal equinox in 2024? In the northern hemisphere, these are known as the spring, or vernal, equinox and the fall, or autumnal, equinox.
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. In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst).