51 weeks until Fall Equinox

There are 51 full weeks and 6 days until Fall Equinox, which falls on Wednesday, September 22, 2027. As a single figure that is 51.9 weeks, and as working time it is 51.8 working weeks.

Full weeks to go

plus 6 days

As a decimal

51.9

weeks

Fall Equinox falls on

September 22

Wednesday, 2027

363 days ÷ 7 = 51.86 weeks · 52 Monday boundaries crossed

How many weeks until Fall Equinox?

51 weeks and 6 days. The September equinox and the start of astronomical autumn in the northern hemisphere, usually 22 or 23 September. The 6-day remainder is the offset between today, a Thursday, and Fall Equinox, a Wednesday. For the day figure ticking live, use the Fall Equinox countdown.

Week by week to Fall Equinox

There are 52 Monday boundaries between now and Fall Equinox, and crossing each one takes a week off the count.

Week boundary	Week starts	ISO week	Weeks still to go
1	September 28, 2026	40	51
2	October 5, 2026	41	50
3	October 12, 2026	42	49
4	October 19, 2026	43	48
5	October 26, 2026	44	47
...	42 further weeks not listed	...	...
48	August 23, 2027	34	4
49	August 30, 2027	35	3
50	September 6, 2027	36	2
51	September 13, 2027	37	1
52	September 20, 2027	38	0

Which week of the year does Fall Equinox fall in?

Fall Equinox 2027 sits in ISO week 38, while today sits in week 39. Because Fall Equinox keeps the same calendar date every year, its ISO week number still drifts, by one week at a time, as the weekday of September 22 moves forward. The Monday-to-Sunday dates are listed on the week 38 page.

Full weeks

Odd days

Working weeks

51.8

ISO week

Weekends

How many weekends are left before Fall Equinox?

52 weekends, counting Saturdays that have not yet passed, out of the 363 days ahead. Of those days, 259 are working days and 104 fall at a weekend. Weekly commitments are easier to plan against the weekday tally than against the raw week count: 52 Mondays and 52 Fridays remain. The weekends until Fall Equinox page sets out the counting rule in full.

Weeks until Fall Equinox in coming years

Year	Date	Weekday	Weeks from today	Odd days
2027	September 22	Wednesday	51	6
2028	September 22	Friday	104	1
2029	September 22	Saturday	156	2
2030	September 22	Sunday	208	3
2031	September 22	Monday	260	4

The gap between 2027 and 2028 is 366 days, or 52.29 weeks, so the week count never simply rises by 52.

Questions

How many weeks until Fall Equinox?: 51 weeks and 6 days, from September 24, 2026 to September 22, 2027.
How many working weeks is that?: 51.8, being 259 Monday-to-Friday days at five per week.
What day of the week is Fall Equinox 2027?: A Wednesday, September 22, 2027, in ISO week 38.
How many days until Fall Equinox?: 363 days. See the live Fall Equinox countdown.

Weeks until other dates

Columbus Day in 2 weeks Halloween in 5 weeks Daylight Saving Time ends in 5 weeks Election Day in 5 weeks Veterans Day in 6 weeks Thanksgiving Day in 9 weeks

Fall Equinox in other units

Weeks until September 22 Months until Fall Equinox Weekends until Fall Equinox Days until Fall Equinox When is Fall Equinox?

All week countdowns · Weeks left in 2026 · Day of the year · Date calculator