- Sep 1 Philadelphia Phillies outfielder Vince DiMaggio smashes his 4th grand slam of season, tying NL record, in an 8-3 win v Boston Braves
Declaration of Independence
Sep 2 Ho Chi Minh declares Vietnam independent from France (National Day)
Surrender of Japan
Sep 2 V-J Day, formal surrender of Japan signed aboard the USS Missouri, marks the end of World War II
- Sep 3 US National Championship Men's Tennis, Forest Hills: American Frank Parker successfully defends title; beats William Talbert 14-12, 6-1, 6-2
- Sep 3 US Women's National Tennis Championship, Forest Hills: Sarah Palfrey Cooke wins second US title; beats Pauline Betz Addie 3-6, 8-6, 6-4
- Sep 3 World War II: Japanese forces in the Philippines surrender to the Allies
- Sep 4 American chess grandmaster Reuben Fine wins 4 simultaneous rapid (10 seconds per move) games blindfolded in New York City
- Sep 4 US regains possession of Wake Island from Japan
- Sep 6 A's catcher Greek George punches umpire Joe Rue gets suspended
- Sep 7 Joe Kuhel hits inside-the-park HR, only HR hit by a Senator all season at Washington's Griffith Stadium
- Sep 8 US invades Japanese-held Korea
1st Computer Bug
Sep 9 1st "bug" in a computer program discovered by Grace Hopper, a moth was removed with tweezers from a relay & taped into the log
- Sep 9 Japanese in South Korea, Taiwan, China, Indochina surrender to Allies
Sports History
Sep 9 Jimmie Foxx hits his 534th & final HR
- Sep 9 Philadelphia A's Dick Fowler no-hits St Louis Browns, 1-0
- Sep 10 KLS-AM in Oakland, California changes call letters to KWBR (now KDIA)
Miracle Mike!
Sep 10 Mike the Headless Chicken is decapitated in Fruita, Colorado; he survives for another 18 months before choking to death.
Quisling Sentenced to Death
Sep 10 Vidkun Quisling, head of the Nazi-controlled Norwegian government during WWII is sentenced to death for collaborating with the Nazis
Hideki Tojo Attempts Suicide
Sep 11 Hideki Tojo, Japanese Prime Minister during most of World War II, attempts suicide rather than face war crimes tribunal but fails - later he is hanged
- Sep 11 Physician Willem J. Kolff performs the first successful kidney dialysis using his artificial kidney machine in the Netherlands
- Sep 15 A hurricane in southern Florida and the Bahamas destroys 366 planes and 25 blimps at NAS Richmond
- Sep 16 Barometric pressure at 856 mb (25.55") off Okinawa (record low)
- Sep 18 1000 whites walk out of Gary, Indiana, schools to protest integration
Kim Il-sung Returns from Exile
Sep 19 Kim Il-sung arrives in the harbor of Wonsan, Korea, after 26 years in exile in the Soviet Union
Lord Haw Haw Sentenced
Sep 19 Lord Haw Haw (William Joyce) sentenced to death in London
- Sep 20 German rocket engineers begin work in US
Cavalcade of Jazz
Sep 23 First Cavalcade of Jazz outdoor concert held at Wrigley Field, Los Angeles with Count Basie, Valaida Snow and others
MacArthur Meets Japanese Emperor
Sep 27 US General and head of the Allied occupation of Japan, Douglas MacArthur, meets Emperor Hirohito in Tokyo for the first time
Mildred Pierce
Sep 28 "Mildred Pierce" starring Joan Crawford opens at Strand Theater, NYC; wins Academy Award for Best Actress
Greenberg's Winning Grand Slam
Sep 30 Detroit's future Baseball Hall of Fame first baseman Hank Greenberg smacks an AL pennant-winning grand slam on the final day of the season as the Tigers beat St. Louis Browns, 6-3
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