- 2 VJ Day, WWII
- 3 Labor Day
- 9 Grandparents Day the first Sunday after Labor Day
- 11 911 Remembrance
- 16 Rosh Hashanah begins at sundown
- 17 Constitution Day
- 21 International Peace Day (UN)
- 22 Autumnal Equinox
- 25 Yom Kippur
- 28 Native American Day the fourth Friday of the month
- 30 Sukkot begins at sundown
- More September holidays and special days