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September Equinox 2026
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Adds an all-day reminder on the date. The event's exact instant is UTC — the calendar entry uses the date, which may differ by a day in your own time zone.
About the September Equinox
The moment the Sun crosses the celestial equator heading south — day and night are close to equal length worldwide.
Marks the start of astronomical autumn in the Northern Hemisphere and astronomical spring in the Southern Hemisphere.
The exact instant is the same moment worldwide — convert it to your own time zone with the time zone converter, or see sunrise, sunset, and day length for any place with the sun calculator.
September Equinox dates, 2026–2031
| Year | Date & time (UTC) |
|---|---|
| 2026 | Wednesday, September 23, 2026 at 12:05 AM UTC |
| 2027 | Thursday, September 23, 2027 at 6:01 AM UTC |
| 2028 | Friday, September 22, 2028 at 11:45 AM UTC |
| 2029 | Saturday, September 22, 2029 at 5:37 PM UTC |
| 2030 | Sunday, September 22, 2030 at 11:27 PM UTC |
| 2031 | Tuesday, September 23, 2031 at 5:15 AM UTC |
Times are UTC — the september equinox lands on the same instant worldwide, so it may fall on the neighbouring calendar day in your own time zone.