The autumnal equinox in 2025 falls on Monday, 22 September 2025.

Quick Scoop: Key Details

  • Date (worldwide): 22 September 2025.
  • Moment of the equinox (Earth-wide instant): Around 18:20–18:19 UTC, corresponding to 2:20 p.m. Eastern Daylight Time and 19:20 British Summer Time, with some sources giving 20:19 in Central European Summer Time.
  • What it marks: The start of astronomical autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
  • Why it matters: At the equinox, the Sun crosses the celestial equator and day and night are nearly equal in length across the globe.

In practical, everyday terms: if you’re in the Northern Hemisphere, 22 September 2025 is the “first day of fall” on the astronomical calendar.

TL;DR: When is the autumnal equinox 2025?
It’s on Monday, 22 September 2025, with the equinox moment around 18:20 UTC (afternoon in North America, evening in Europe).

Information gathered from public forums or data available on the internet and portrayed here.