September 2031 Calendar
September 2031 has 30 days, from Monday, September 1 to Tuesday, September 30. It has 21 working days and one federal holiday: Labor Day (Monday, September 1).
Updated · By the YearlyCalendar.org team
- Federal holiday / day off
- Observance
- Weekend
US federal holidays shaded · Wk = ISO week number
| Wk | SundaySun | MondayMon | TuesdayTue | WednesdayWed | ThursdayThu | FridayFri | SaturdaySat |
|---|---|---|---|---|---|---|---|
| 36 | 1Labor Day | 2 | 3 | 4 | 5 | 6 | |
| 37 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 38 | 14 | 15 | 16 | 17 | 18Rosh Hashanah | 19 | 20 |
| 39 | 21 | 22 | 23 | 24 | 25 | 26 | 27Yom Kippur |
| 40 | 28 | 29 | 30 |
Holidays and observances in September 2031
| Holiday | Date | Day | Type |
|---|---|---|---|
| Labor Day | Monday | Federal | |
| Rosh Hashanah Begins at sundown the evening before. | Thursday | Religious | |
| Yom Kippur Begins at sundown the evening before. | Saturday | Religious |
September 2031 at a glance
Key dates in September 2031
Times are Eastern Time (EST/EDT).
| Date | Event | Details |
|---|---|---|
| September equinox — first day of fall | Tuesday, September 23, 1:15 AM EDT |
Moon phases in September 2031
September 2031 has two full moons; the second, on September 30, is a blue moon. Times are Eastern Time (EST/EDT). All 2031 moon phases.
| Phase | Date | Time (ET) |
|---|---|---|
| Full Moon (Corn Moon) | 5:20 AM EDT | |
| Last Quarter | 12:14 PM EDT | |
| New Moon | 2:47 PM EDT | |
| First Quarter | 9:20 PM EDT | |
| Full Moon (Harvest Moon) | 2:58 PM EDT |
August 2031 and October 2031
About September
From the Latin septem, "seven" — it was the seventh month of the old Roman calendar. Birthstone: Sapphire. Birth flower: Aster. Zodiac: Virgo / Libra. All 12 months.
Frequently asked questions
What are the first and last business days of September 2031?
The first business day is Tuesday, September 2 and the last is Tuesday, September 30, counting Monday–Friday and skipping US federal holidays.
How many working hours are in September 2031?
September 2031 has 168 working hours at 8 hours per working day, or 176 hours for someone who works through the federal holidays.
Are there any three-day weekends in September 2031?
Yes. Federal workers get one three-day weekend: Aug 30 – Sep 1 (Labor Day).
How many weekends are in September 2031?
September 2031 has four full Saturday–Sunday weekends. Mondays and Tuesdays occur five times and every other weekday four times.