Click on the September holidays listed in blue for more details.
| Holidays | Date | Details |
|---|---|---|
| Labor Day 2021 | Sep 6 - Monday | Federal Holiday |
| Rosh Hashanah 2021 | Sep 7 - Tuesday | Jewish |
| International Literacy Day 2021 | Sep 8 - Wednesday | Global |
| Patriot Day 2021 | Sep 11 - Saturday | Observance |
| National Grandparents Day 2021 | Sep 12 - Sunday | Observance |
| International Day of Democracy 2021 | Sept 15 - Wednesday | Global |
| Yom Kippur 2021 | Sep 16 - Thursday | Jewish |
| Constitution Citizenship Day 2021 | Sep 17 - Friday | Observance |
| National POW/MIA Recognition Day 2021 | Sep 17 - Friday | Observance |
| Sukkot 2021 | Sep 21 - Tuesday | Jewish |
| Fall/ Spring - September equinox 2021 | Sep 22 - Wednesday | Season |
| World Maritime Day 2021 | Sep 23 - Thursday | Global |
| Gold Star Mother's Day 2021 | Sep 26 - Sunday | Observance |
| Shemini Atzeret 2021 | Sep 28 - Tuesday | Jewish |
| Simchat Torah 2021 | Sep 29 - Wednesday | Jewish |
