When Is The Autumn Equinox Uk 2024. While meteorologists like to call fall at the beginning of september, astronomical autumn starts later, on the autumnal equinox. The autumnal equinox occurs in september each year, and in the northern hemisphere the date marks the end of summer and beginning of autumn.

This means that the sun illuminates the northern or. Here’s everything you should know about the fall equinox—plus our.