Autumnal Equinox September 2025

Autumnal Equinox September 2025. In 2025, the autumnal equinox will take place on september 22,at 08:44 a.m. Simon king has the answers.

While meteorologists like to call fall at the beginning of september, astronomical autumn starts later, on the autumnal equinox. Autumnal equinox, two moments in the year when the sun is exactly above the equator and day and night are of equal length;