| National Honey Month | September |
| National School Success Month | September |
| National Piano Month | September |
| Library Card Signup Month | September |
| National 5-A-Day Month | September |
| Titanic Wreck Discovered | Sep 1, 1985 |
| D.A.R.E. Launched | Sep 1, 1983 |
| Sand Sculpture World Championships | Sep 1-30, 2009 |
| Great Fire of London | Sep 2, 1666 |
| US Treasury Established | Sep 2, 1789 |
| General Sherman Enters Atlanta | Sep 2, 1864 |
| Vietnam Independence Day | Sep 2, 1945 |
| Christa McAuliffe's Birthday | Sep 2, 1948 |
| Treaty of Paris Ends American Revolution | Sep 3, 1783 |
| Little Rock Nine greeted by National Guard at Central High School | Sep 4, 1957 |
| Crocodile Hunter Steve Irwin Died | Sep 4, 2006 |
| Newspaper Carrier Day | Sep 4, 1833 |
| First Electric Light Installed in Manhattan | Sep 4, 1882 |
| Labor Day | Sep 7, 2009 |
| Jerry Lewis MDA Telethon | Sep 7, 2009 |
| "Wonderful Wizard of Oz" Published | Sep 8, 1900 |
| Northern Pacific Railroad Completed | Sep 8, 1883 |
| International Literacy Day | Sep 8, 2009 |
| Patriot Day | Sep 11, 2009 |
| Terrorists Attack World Trade Center and Pentagon | Sep 11, 2001 |
| Bella Swan's Birthday | Sep 13th, 1987 |
| Star-Spangled Banner Inspired | Sep 13, 1814 |
| Roald Dahl's Birthday | Sep 13, 1916 |
| Whooping Crane Fall Migration | Sep 15 - Nov 15 |
| Australia Hosts Olympics 2000 | Sep 15, 2000 |
| Pilgrims left Plymouth England on the Mayflower | Sep 16, 1620 |
| National Play-Doh Day | Sep 16, 2009 |
| U.S. Constitution Approved at Constitutional Convention | Sep 17, 1787 |
| Constitution Day | Sep 17, 2009 |
| Anniversary of US Constitution | Sep 17, 1787 |
| U.S. Air Force Established | Sep 18, 1947 |
| Rosh Hashanah | Sep 18-20, 2009 |
| Talk Like a Pirate Day | Sep 19, 2009 |
| Typographic Smiley Face Invented | Sep 19, 1982 |
| Orville Wright Made First Complete Circle in an Airplane | Sep 20, 1904 |
| Houdini Premiers Greatest Escape | Sep 21, 1912 |
| Elephant Appreciation Day | Sep 22, 2009 |
| Italo Marchiony Applied for Ice Cream Cone Patent | Sep 22, 1903 |
| President Lincoln Issued Emancipation Proclamation | Sep 22, 1862 |
| Autumn Begins: Fall Leaves | Sep 22, 2009 |
| Fall Equinox | Sep 22, 2009 |
| Deaf Awareness Week | Sep 22-28, 2009 |
| Little Rock Nine Enter Central High School | Sep 23, 1957 |
| Planet Neptune Discovered | Sep 23, 1846 |
| Lewis and Clark Expedition Arrive in St. Louis | Sep 23, 1806 |
| National Punctuation Day | Sep 24, 2009 |
| Shel Silverstein's Birthday | Sep 25, 1930 |
| Sandra Day O'Connor Sworn in as First Female Justice of U.S. Supreme Court | Sep 25, 1981 |
| Anniversary of 1st US Newspaper | Sep 25, 1690 |
| Birthday of John Chapman (known as Johnny Appleseed) | Sep 26, 1774 |
| George Gershwin's Birthday | Sep 26, 1898 |
| First Televised Presidential Debate | Sep 26, 1960 |
| Shamu's Birthday | Sep 26, 1985 |
| Banned Books Week | Sep 26 - Oct 3, 2009 |
| Juan Ponce de Leon named Military Governor of Bimini and Florida | Sep 27, 1514 |
| Ancestor Appreciation Day | Sep 27, 2009 |
| Pokemon Debuts in US | Sep 28, 1998 |
| Yom Kippur | Sep 28, 2009 |
| Archaeopteryx Fossil Discovery | Sep 30, 1861 |
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