Autumn Equinox 2024. Normally, the autumn equinox falls between 22 and 24 september, and this year the equinox occurs on 22 september at 13:44 bst. Here's everything you should know about the fall equinox—plus our.

It happens because of how earth moves around the sun and tilts on its axis. The autumn equinox is sometimes referred to as the september equinox.