Autumn Equinox 2024 Day. Normally, the autumn equinox falls between 22 and 24 september, and this year the equinox occurs on 22 september at 13:44 bst. Australia equinox and solstice dates.

On that day, the autumnal equinox will occur, marking the beginning of fall. On the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the northern hemisphere to the southern.