September Equinox in United States of America

In 2026, September Equinox falls on Tuesday, 22 September 2026.

flat lay photography of purple and red leaves
Photo by Jeremy Thomas on UnsplashUpdated 15 Sep 2026

About September Equinox

The September Equinox occurs when the Sun aligns directly with the Earth's equator, marking the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. In the United States, it is recognized as an astronomical event rather than a public holiday. It is observed by those interested in natural cycles and the changing of the seasons.

September Equinox dates in United States of America

Observance dates for September Equinox across a 10-year window (2023-2031).

23 Sep 2023

Saturday · September Equinox

2023

22 Sep 2024

Sunday · September Equinox

2024

22 Sep 2025

Monday · September Equinox

2025

22 Sep 2026

Tuesday · September Equinox

2026

23 Sep 2027

Thursday · September Equinox

2027

22 Sep 2028

Friday · September Equinox

2028

22 Sep 2029

Saturday · September Equinox

2029

22 Sep 2030

Sunday · September Equinox

2030

23 Sep 2031

Tuesday · September Equinox

2031

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