Autumn Fall Equinox 2025. We celebrate the september equinox as the first day of autumn for the northern hemisphere, and the first day of spring for the southern hemisphere. Before we dive into the rituals, let’s talk about what makes the autumn.

Autumn equinox 2025 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,. In the northern hemisphere, the closest autumnal equinox will take place on september 22, 2025, at 12:44 gmt (08:44 a.m.