First Day Of Autumn 2024 Canada 2024. Autumn 2024 starts on sunday, 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. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
The autumnal equinox brings fall to the northern hemisphere today as the sun passes directly over the equator at noon. The fall equinox will be the first sunrise in months at the south pole.
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