September equinox 2027 is on Thursday, 23 September 2027.
Published by a named source, listed below.
September equinox 2026 was on Wednesday, 23 September 2026. The next one is above.
At a glance
- Type
- International day
- Date
- Thursday, 23 September 2027
- Date each year
- Moves from year to year
What it is
The Sun crosses the equator heading south: astronomical autumn begins in the Northern Hemisphere and spring in the Southern. Exact moments in UTC (US Naval Observatory): 23 September 2026 at 00:05; 23 September 2027 at 06:02; 22 September 2028 at 11:45. Dates are UTC dates: east of UTC it can already be the next day, west of UTC still the day before.
Also known as Autumn equinox, Autumnal equinox, Fall equinox, First day of autumn.
Past and coming years
- 2026Wednesday, 23 September 2026
- 2027Thursday, 23 September 2027
- 2028Friday, 22 September 2028
- 2029Not published yet
Every date and its source
| Date | Source |
|---|---|
| 2027 | |
| Thursday, 23 September 2027 | Equinoxes and solstices |
| 2026 | |
| Wednesday, 23 September 2026 | Equinoxes and solstices |
| 2028 | |
| Friday, 22 September 2028 | Equinoxes and solstices |
Questions
When is September equinox 2028?
September equinox 2028 is on Friday, 22 September 2028.
Is the September equinox 2027 date confirmed?
Confirmed. Published by a named source, listed below.
What else falls on Thursday, 23 September 2027?
Ashtami.
Where does the September equinox date come from?
One named source: Equinoxes and solstices. Each is linked under Sources.
Can I add September equinox to my calendar?
Yes. Use "Add to calendar" above: the .ics file opens in Google Calendar, Apple Calendar and Outlook, and lists every sourced date.
Also on this day
Related dates
Sources
Equinoxes and solstices 2026–2028
- US Naval Observatory: Earth's Seasons (equinoxes and solstices, UTC) · last verified 24 October 2026
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