Autumn doesn’t have just one universal start date – it depends on which definition and which hemisphere you mean.

Quick Scoop

  • In the Northern Hemisphere (Europe, USA, etc.) :
    • Meteorological autumn: 1 September to 30 November.
* Astronomical autumn: from the September equinox (around 22–23 September) to the December solstice (around 21–22 December).
  • In the Southern Hemisphere (Australia, New Zealand, etc.) :
    • Meteorological autumn: 1 March to 31 May.
* Astronomical autumn: from the March equinox (around 20–21 March) to the June solstice.
  • In everyday life, people often “feel” autumn when:
    • Days get noticeably shorter and cooler.
    • Leaves start changing colour and falling.

A tiny story-style example

Imagine you wake up, step outside, and notice the air feels cooler, the sun sets earlier, and trees are slowly turning orange and red. That’s the classic autumn vibe , which usually shows up from mid‑September in much of the Northern Hemisphere and from mid‑March in much of the Southern Hemisphere, even if the official start is defined by calendars or equinox dates.

TL;DR:

  • North: autumn is September–November (meteorological) or late September to late December (astronomical).
  • South: autumn is March–May (meteorological) or late March to late June (astronomical).

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