When Is Autumn 2025. 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. 2025 academic year dateline this dateline, approved by the university's executive, is subject.

2025 academic year dateline this dateline, approved by the university’s executive, is subject. Sydney the exact moment of the autumnal equinox in 2025 is 21 june, at 12:42:02.