Autumn 2025 First Day

Autumn 2025 First Day. Here's everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and. The first day of autumn is in 2025 on september 22 (according to the astronomical definition).


Autumn 2025 First Day

The first day of autumn is marked with the autumnal equinox. This is when autumn 2025 officially starts in the southern hemisphere.

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