Autumn Equinox 2025 Australia Date. This page provides date and time for autumnal equinox in the year 2025 for sydney, new south wales, australia.  — the word equinox is derived from latin and literally translates to equal night.

 — autumn 2025 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the. On these days, everywhere on earth experiences roughly 12 hours of sunshine.