September 5 is the 248th day of the year. 117 days remain until the end of the year.
- 1187 – Louis VIII, king of France (d. 1226)
- 1638 – Louis XIV, king of France (d. 1715)
- 1847 – Jesse James, American outlaw (d. 1882)
- 1735 – Johann Christian Bach, German-English viol player and composer (d. 1782)
- 1936 – John Danforth, American politician and diplomat, 24th United States Ambassador to the United Nations
- 1983 – Lincoln Riley, American football coach
- 1986 – Colt McCoy, American football player
- 1165 – Nijō, emperor of Japan (b. 1143)
- 1877 – Crazy Horse, American tribal leader (b. 1849)
- 1912 – Arthur MacArthur, Jr., American general (b. 1845)
- 1725 – Wedding of Louis XV and Maria Leszczyńska.
- 1774 – First Continental Congress assembles in Philadelphia.
- 1781 – Battle of the Chesapeake in the American Revolutionary War: The British Navy is repelled by the French Navy, contributing to the British surrender at Yorktown.
- 1812 – War of 1812: The Siege of Fort Wayne begins when Chief Winamac’s forces attack two soldiers returning from the fort’s outhouses.
- 1836 – Sam Houston is elected as the first president of the Republic of Texas.
- 1941 – Whole territory of Estonia is occupied by Nazi Germany.
- 1960 – Muhammad Ali (then known as Cassius Clay) wins the gold medal in the light heavyweight boxing competition at the Olympic Games in Rome.
- 1972 – Munich massacre: A Palestinian terrorist group called “Black September” attacks and takes hostage 11 Israeli athletes at the Munich Olympic Games. Two die in the attack and nine are murdered the following day.
- 1975 – Sacramento, California: Lynette Fromme attempts to assassinate U.S. President Gerald Ford.
- 1977 – Voyager Program: NASA launches the Voyager 1 spacecraft.
- International Day of Charity
- National Be Late For Something Day
- National Cheese Pizza Day
- World Samosa Day
- National Shrink Day