- Sep 1 Jews living in Germany are required to wear a yellow star of David
- Sep 2 Academy copyrights Oscar statuette
- Sep 3 1st use of Zyclon-B gas in Auschwitz (on Russian prisoners of war) [1]
- Sep 3 KYW TV channel 3 in Philadelphia, PA (NBC) begins broadcasting
- Sep 4 New York Yankees clinch their 3rd straight AL pennant; beat the Red Sox, 6-3; earliest date in baseball history a team has captured a flag
- Sep 4 US destroyer Greer fires on German submarine U-652
- Sep 6 All Jews over age 6 in German territories ordered to wear a star
- Sep 6 Jews of Vilna Poland confined to their ghetto
US Men's Tennis Open
Sep 7 US National Championship Men's Tennis, Forest Hills, NY: 1939 champion Bobby Riggs beats Frank Kovacs 5-7, 6-1, 6-3, 6-3
- Sep 7 US National Championship Women's Tennis, Forest Hills, NY: Sarah Palfrey Cooke beats fellow American Pauline Betz Addie 7-5, 6-2; sweeps all 3 women's titles
- Sep 8 Blockade of Leningrad (St Petersburg) by German forces begins
- Sep 8 Entire Jewish community of Meretsch, Lithuania, is exterminated
Siege of Leningrad
Sep 8 WWII: Siege of Leningrad by German, Finnish, and eventually Spanish troops begins; battle lasted over 28 months, as Russia repels the invasion; well over a million lives
Lindbergh's War Claim
Sep 11 Charles Lindbergh, claims the "British, Jewish and Roosevelt administration" are trying to get the US into World War II
Pentagon Construction Begins
Sep 11 Construction of the Pentagon begins in Arlington County, Virginia (completed Jan 15, 1943). Designed by architect George Bergstrom and built by contractor John McShain, construction was overseen by Leslie Groves.
Axis Invasion of Yugoslavia
Sep 16 Adolf Hitler orders that for every dead German, 100 Yugoslavs should be killed
- Sep 16 German armoured troops surround Kyiv, Ukraine
- Sep 16 Jews of Vilna, Poland, confined to the Ghetto
Stan Musial Debut
Sep 17 Cards' Stan Musial makes his major league debut, going 2-for-4
Meeting Between Bohr and Heisenberg
Sep 17 Famous meeting between Danish physicist Niels Bohr and German head of nuclear energy project Werner Heisenberg in Copenhagen to discuss nuclear weapons (date approximate)
- Sep 17 The New Zealand Labour Party abolishes the death penalty (It is reintroduced by the National government in 1950 before being finally removed from the statute book in 1961)
- Sep 17 World War II: A decree issued by the Soviet State Committee of Defense, restoring Vsevobuch "Universal compulsory military training of the citizens of the USSR" in the face of the "Great Patriotic War"
Tito Meets Draža
Sep 19 First meeting of partisan leaders Josip Broz Tito and Draža Mihailović in Yugoslavia
- Sep 19 German army conquers Kiev
- Sep 19 Nazis force German Jews, 6 & over to wear Jewish stars
- Sep 22 British signal officer Bill Hudson lands in Montenegro
- Sep 23 General de Gaulle forms government in exile in London
- Sep 23 German air raid on Soviet naval base at Kronstadt (battleship Marat sinks)
- Sep 23 The first gas murder experiments are conducted at Auschwitz. concentration camp
- Sep 24 Bomb explosion in German headquarter in Hotel Continental in Kiev
- Sep 24 Nine Allied governments pledge adherence to the common principles of policy set forth in the Atlantic Charter
- Sep 25 Brooklyn Dodgers win their 1st pennant in 21 years
Reinhard Heydrich
Sep 27 Reinhard Heydrich, "butcher of Prague," appointed SS-general (Gruppenfuehrer)
1st Liberty Ship
Sep 27 US President Roosevelt launches the 1st Liberty ship, freighter SS Patrick Henry
- Sep 28 Phillies lose club record 111th game
Ted Williams Best Year
Sep 28 Ted Williams ended the baseball season with .406 batting avg
- Sep 29 Million jam downtown Brooklyn to cheer NL champ Dodgers in a parade
- Sep 29 Nazi massacre at Babi Yar ravine (near Kiev) Ukraine begins, 33,771 mostly Jews murdered
- Sep 30 Approximately 33,771 Jews are shot to death or buried alive at Babi Yar ravine (near Kiev) Ukraine by Nazi troops over two days
- Sep 30 German assault on Moscow, Operation Typhoon, begins
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