September 21, 2027 falls on a Tuesday
September 21, 2027 is a Tuesday. It is 363 days from today, September 23, 2026. The date is day 264 of 365 in 2027, it sits in ISO week 38, and it is the 21st of a 30-day month with 9 days after it.
What day of the week is September 21?
In 2027 it is a Tuesday. The weekday is not a property of the date itself, it is a property of the date in a given year, so the honest answer always names the year. A common year is 365 days, which is 52 weeks plus one spare day, so a fixed date moves forward one weekday from one year to the next. A leap year inserts a second spare day, so the step is two whenever 29 February falls inside the gap. That is why September 21 works its way around the week rather than repeating on a tidy schedule.
September 21 in the next few years
| Year | Weekday | Day of year | ISO week | Leap year |
|---|---|---|---|---|
| 2026 | Monday | 264 | 39 | no |
| 2027 | Tuesday | 264 | 38 | no |
| 2028 | Thursday | 265 | 38 | yes |
| 2029 | Friday | 264 | 38 | no |
| 2030 | Saturday | 264 | 38 | no |
| 2031 | Sunday | 264 | 38 | no |
| 2032 | Tuesday | 265 | 39 | yes |
| 2033 | Wednesday | 264 | 38 | no |
Between 2026 and 2027 the weekday moves from Monday to Tuesday, a step of 1. The day-of-year column also moves: September 21 is day 264 in a common year and day 265 in a leap year, because it sits after 29 February.
How often does September 21 fall at a weekend?
Counting the 28 occurrences from 2027 to 2054, September 21 lands on a Saturday 4 times and on a Sunday 4 times, so 8 of those 28 years put it at a weekend. Over a full 28-year stretch the Gregorian calendar repeats itself, and a fixed date visits each weekday four times, so the long-run answer is two weekend years in every seven.
Where September 21 sits in the calendar
September 21 is the 21st day of September, a month of 30 days in 2027, leaving 9 days of the month after it. Measured from 1 January it is 263 days into the year, and 101 days remain to 31 December, which puts it 72.3% of the way through 2027. In September 2027 the other Tuesdays are the 7th, 14th, 28th, because weekdays repeat every seven days inside a month just as they do across one.
What else happens around September 21?
| Date | Occasion | Type | Days from September 21 |
|---|---|---|---|
| September 22 | September equinox | astronomical | 1 after |
How far away is September 21?
The next September 21 is Tuesday, September 21, 2027, 363 days from today. That is 51 whole weeks and 6 days, or 51.9 weeks written as a decimal. To count towards it second by second, use the date calculator.
Questions
- What day of the week is September 21, 2027?
- A Tuesday. It is day 264 of 365 and falls in ISO week 38.
- What day of the week is September 21 next year?
- In 2027 it is a Tuesday.
- What number day of the year is September 21?
- Day 264 in a common year and day 265 in a leap year. See day 264 for more.
- Which week of the year is September 21 in?
- ISO week 38 in 2027. The week 38 page lists every date in it.
Nearby dates
The 21st of other months
All 366 dates · Week 38 · Day 264 of the year · Event countdowns · When is it? · Date calculator