| September 2021 | ||
|---|---|---|
| Date | Holiday | Where |
| September-2, Thursday | Queen Lili‘uokalani Day | Hawaii (Designated Days) |
| September-3, Friday | DeSoto Day | Florida (Designated Days) |
| September-4, Saturday | Native American Day | Delaware (Special Days) |
| September-6, Monday | Labor Day | New York Stock Exchange (NYSE Holidays 2021) |
| September-6, Monday | Labor Day | Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Federal, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming (Public Holidays) |
| September-6, Monday | Labor Day | US Banks (US Bank Holidays 2021) |
| September-6, Monday | Labor Day | United States Postal Service (USPS Holidays 2021) |
| September-8, Wednesday | Older Alaskans' Day | Alaska (Designated Days) |
| September-9, Thursday | Admission Day | California (Designated Days) |
| September-11, Saturday | Patriot Day | Hawaii (Designated Days) |
| September-11, Saturday | September 11th Day of Remembrance | Illinois (Designated Days) |
| September-12, Sunday | Grandparents' and Family Caregivers' Day | Florida (Designated Days) |
| September-12, Sunday | Great Grandparents Day | Illinois (Designated Days) |
| September-13, Monday | Florida Missing Children's Day | Florida (Designated Days) |
| September-17, Friday | Constitutional commemorative day | Idaho (Designated Days) |
| September-17, Friday | POW/MIA Recognition Day | Illinois (Designated Days) |
| September-17, Friday | POW/MIA Recognition Day | Arkansas (Memorial Days) |
| September-21, Tuesday | Peace Day | Hawaii (Designated Days) |
| September-24, Friday | Native American Day | California (Designated Days) |
| September-25, Saturday | Native American Day | Kansas (Designated Days) |
| September-26, Sunday | Gold Star Family Day | Hawaii (Designated Days) |
| September-27, Monday | Arizona first responders' day of gratitude and remembrance | Arizona (Observed Days) |
| September-28, Tuesday | Cabrillo Day | California (Designated Days) |