When Is The Autumnal Equinox 2024. In 2024, that will occur on sunday, sept. The fall — or autumnal — equinox can land on sept.

The days are getting shorter, the air is getting a little bit more crisp, and soon, the leaves will start turning their annual shades of red and gold. Autumn equinox 2024 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,.