Countdown to Autumn Equinox 2027
September equinox 2027 is on Thursday, September 23, 2027 at 06:02 UTC (see your local time below). The September equinox — the start of astronomical autumn in the Northern Hemisphere and of spring in the Southern Hemisphere.
How long until September equinox?
- Calendar days
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- Weeks and days
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- Weekdays (Mon–Fri)
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- Weekends
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- Total hours
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- Months and days
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Counted from today in your time zone. Weekdays exclude Saturdays and Sundays but not public holidays — for that, use the business days calculator.
September equinox 2027 at a glance
- Date
- Thursday, September 23, 2027
- Exact moment
- 06:02 UTC
- Day of the year
- Day 266 of 365
- ISO week
- Week 38
September equinox dates, 2025–2035
The September equinox is the instant the Sun crosses the celestial equator heading south. It is a single worldwide moment, so its local date depends on your time zone.
| Year | Date | Day | Time (UTC) | From today |
|---|---|---|---|---|
| 2025 | September 22 | Monday | 18:20 UTC | — |
| 2026 | September 23 | Wednesday | 00:06 UTC | — |
| 2027 | September 23 | Thursday | 06:01 UTC | — |
| 2028 | September 22 | Friday | 11:45 UTC | — |
| 2029 | September 22 | Saturday | 17:38 UTC | — |
| 2030 | September 22 | Sunday | 23:27 UTC | — |
| 2031 | September 23 | Tuesday | 05:15 UTC | — |
| 2032 | September 22 | Wednesday | 11:11 UTC | — |
| 2033 | September 22 | Thursday | 16:52 UTC | — |
| 2034 | September 22 | Friday | 22:40 UTC | — |
| 2035 | September 23 | Sunday | 04:39 UTC | — |
Times are computed from the rule above and rounded to the minute; your local time is shown alongside UTC.
About September equinox
- It starts astronomical autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
- From now until the March equinox, nights are longer than days everywhere north of the equator.
Questions about September equinox 2027
What day of the week is September equinox 2027?
September equinox 2027 falls on a Thursday (Thursday, September 23, 2027), at 06:02 UTC.
When is September equinox 2028?
September equinox 2028 is on Friday, September 22, 2028, at 11:45 UTC.
How is the date of September equinox determined?
The September equinox is the instant the Sun crosses the celestial equator heading south. It is a single worldwide moment, so its local date depends on your time zone.
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