Autumn Equinox 2025 Est. In 2025, the autumnal (fall) equinox arrives on monday, september 22, marking the official first day of fall. Autumn 2025 starts on monday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth's axis.


Autumn Equinox 2025 Est

The autumn equinox will occur on monday, sep. The first day of autumn is in 2025 on september 22 (according to the astronomical definition).

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