There are 315 days until Autumn Equinox 2027, on Wednesday, 22 September 2027 (Wednesday). This page counts down to the day, explains what it is and how it is observed, and gives the dates for 2026, 2027 and 2028.
Try the tool: Countdown Timer — count down to Autumn Equinox 2027 live, second by second.
Try the tool: Days Until Calculator — count the days until any date, including Autumn Equinox.
When is Autumn Equinox 2027?
Autumn Equinox 2027 is on Wednesday, 22 September 2027 — Wednesday. That is 315 days from today (11 November 2026) — 45 weeks and 0 days, or about 10.3 months. It is a Seasonal observance.
How the countdown is worked out
The countdown is the number of days from today to the holiday's date: Wednesday, 22 September 2027 minus 11 November 2026 is 315 days. The count is in calendar days — it counts the days you have to wait, not the number of midnights, and it does not count today. The countdown timer recomputes the number live, second by second, and the days until calculator does the same calculation for any date you choose. If the holiday is in a different time zone from you, the day starts at a different moment — but the date is the date, and the countdown is in days, so the time zone does not change the number.
What is Autumn Equinox?
The autumn equinox is the day when day and night are roughly equal, marking the start of autumn in the Northern Hemisphere (around 22 September) and spring in the Southern Hemisphere.
How Autumn Equinox is observed
It is marked by harvest festivals in many cultures, including the Mid-Autumn Festival in East Asia, and by the start of the astronomical autumn.
How the date is worked out
Autumn Equinox is on the same date every year — September 2027 — so the date never moves. The only thing that changes is the day of the week: Autumn Equinox 2027 is a Wednesday, Autumn Equinox 2028 is a Friday.
Autumn Equinox dates — 2026, 2027 and 2028
| Year | Date | Day of the week |
|---|---|---|
| 2026 | 22 September 2026 | Tuesday |
| 2027 | 22 September 2027 | Wednesday |
| 2028 | 22 September 2028 | Friday |
Autumn Equinox 2027 in the calendar
Autumn Equinox 2027 is the 265th day of 2027 — a year of 365 days — and it falls in ISO week 38 of the year. There are 100 days left in the year after it, and 30 days in September 2027. In the Northern Hemisphere it is autumn; in the Southern Hemisphere the seasons are reversed.
The week number matters more than people think: in business and government across Europe, dates are often given as week numbers, and the week number finder gives the ISO week for any date. The day-of-year number is used in astronomy, in logistics and in some payroll systems. And the days-left figure is the useful one for planning the rest of the year: after Autumn Equinox 2027 there are 100 days — 14 weeks — left in 2027.
Planning for Autumn Equinox 2027
315 days is 10 months — plenty of time to plan. If Autumn Equinox means travel, book it now: fares and hotels are usually cheapest months in advance, and the popular dates sell out. If it means time off work, put the request in early, especially if the holiday falls on a weekday — Wednesday is a working day for most people, so the day off needs to be booked. And if it means gifts or preparations, the countdown is long enough that a little planning each week is worth more than a rush in the last few days.
Autumn Equinox 2027 falls on a Wednesday — a weekday — so most people need to take the day off to mark it properly. Book the time off early, especially if the holiday is one people travel for: the days around a weekday holiday are among the busiest travel days of the year, and the fares rise as the date approaches.
The countdown in other units
The countdown to Autumn Equinox 2027 is 315 days — which is 45 weeks and 0 days, 7560 hours, 453,600 minutes, or about 10.3 months. Of those 315 days, 225 are weekdays and 90 are weekend days — so if you are counting working days, there are 225 of them left before the holiday. The days between dates calculator works out the same numbers for any two dates, and the business days calculator counts the working days excluding public holidays.
Autumn Equinox around the world
As a seasonal marker, this day is fixed by astronomy, not by any calendar or government: it is the equinox or the solstice, the day the Earth's tilt puts the Sun in a particular place. The date moves by a day from year to year (around 20–22 March, June, September and December), and it is marked by festivals and traditions around the world rather than by a public holiday.
Planning checklist for Autumn Equinox 2027
| When | Task |
|---|---|
| Now | Put Wednesday, 22 September 2027 in your calendar, with a reminder three months before. |
| Three months before | Book travel and request time off, if Autumn Equinox means either — fares are usually cheapest this far out. |
| One month before | Buy gifts or make preparations, and confirm plans with family. |
| One week before | Check the date once more — the date is fixed — and finalise the plan. |
More countdowns
If you are counting down to Autumn Equinox, you may also be counting down to Christmas Day 2027, New Year's Day 2027, Easter Sunday 2027. And for the same holiday in another year, see Autumn Equinox 2026 and Autumn Equinox 2028.
Frequently asked questions
When is Autumn Equinox 2027?
Autumn Equinox 2027 is on Wednesday, 22 September 2027 (Wednesday).
How many days until Autumn Equinox 2027?
There are 315 days until Autumn Equinox 2027 from 11 November 2026.
What day of the week is Autumn Equinox 2027?
Autumn Equinox 2027 is a Wednesday.
When is Autumn Equinox in 2026?
Autumn Equinox 2026 is on Tuesday, 22 September 2026 (Tuesday).
Is Autumn Equinox a public holiday?
Autumn Equinox is widely observed, but whether it is a public holiday depends on the country — check your local calendar.
What is Autumn Equinox?
The autumn equinox is the day when day and night are roughly equal, marking the start of autumn in the Northern Hemisphere (around 22 September) and spring in the Southern Hemisphere.
How many weeks until Autumn Equinox 2027?
There are 45 weeks and 0 days until Autumn Equinox 2027 — 315 days in total.
How many working days are left until Autumn Equinox 2027?
Count the weekdays between today and the holiday: the business days calculator does it, excluding weekends and the public holidays you add. The countdown in other units above gives the weekday count for Autumn Equinox 2027.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - Holiday dates: TimeFlow's own holiday data (
data/holidays.ts). - TimeFlow's countdown timer and days until calculator — the live tools behind the countdown on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.