Australia vs South of England
Sep 1 Australian Test batsmen Don Bradman (143), Lindsay Hassett (151) & Neil Harvey (110) score centuries in Australia's 1st innings of drawn cricket tour match v South of England at Hastings
Wilhelmina Abdicates
Sep 4 Queen Wilhelmina abdicates the Dutch throne in favour of her daughter Juliana because of illness, after 58 years, longest of any Dutch monarch
- Sep 5 Davis Cup Men's Tennis, Forest Hills, NY: 3 straight titles for US as Gardnar Mulloy & Bill Talbert beat Australians Colin Long & Bill Sidwell 8-6, 9-7, 2-6, 7-5 for unassailable 3-0 lead; ends 5-0
- Sep 5 In France, Robert Schuman becomes President of the Council while being Foreign minister, As such, he is the negotiator of the major treaties of the end of World War II.
Queen Juliana
Sep 6 Juliana crowned Queen of The Netherlands
- Sep 6 Robert Stolz and Robert Sour's musical "Mr Strauss Goes to Boston" opens at Century Theater, NYC; runs for 12 performances
- Sep 7 1st use of synthetic rubber in asphaltic concrete, Akron Oh
- Sep 8 British De Havilland DH108-fighter flies faster than sound
- Sep 9 "Hilarities (of 1949)" opens at Adelphi Theater NYC for 14 performances
- Sep 9 Brooklyn Dodger Rex Barney no-hits NY Giants, 2-0
- Sep 10 Australian cricketer Don Bradman scores 153 in his last 1st-class cricket innings in England
- Sep 10 Bijz Criminal division sentences war criminal Jacob Folks to life
- Sep 13 Margaret Chase Smith, American politician (R-Me) elected senator, 1st woman to serve in both houses of US Congress
Gerald Ford's Upset
Sep 14 Gerald Ford upsets Representative Bartel J Jonkman in Michigan 5th Dist Republican primary
- Sep 14 Groundbreaking ceremony for initial buildings of United Nations Headquarters is held in New York City
- Sep 14 Groundbreaking ceremony for UN world headquarters in New York
- Sep 15 F-86 Sabre sets world aircraft speed record of 1080 kph
- Sep 15 Musical revue "Small Wonder", starring Tom Ewell, opens at Coronet Theater, NYC; runs for 134 performances
- Sep 15 WHN-AM in NY City changes call letters to WMGM
- Sep 16 "Heaven on Earth" opens at Century Theater NYC for 12 performances
- Sep 16 Robert Stolz and Robert Sour's musical "Mr Strauss Goes to Boston" closes at Century Theater, NYC after 12 performances
- Sep 17 KCOP TV channel 13 in Los Angeles/Hollywood, CA (IND) begins
- Sep 17 WLS TV channel 7 in Chicago, IL (ABC) begins broadcasting
- Sep 18 "Hilarities (of 1949)" closes at Adelphi Theater NYC after 14 performances
- Sep 18 Communist Madiun-uprising in Dutch Indies (Muso/Sjarifudin)
Bunche Palestine Mediator
Sep 18 Ralph Bunche confirmed as acting UN mediator in Palestine
- Sep 19 US National Championship Men's Tennis, Forest Hills, NY: Pancho Gonzales wins first of 2 consecutive US singles titles; beats Eric Sturgess 6-2, 6-3, 14-12
US Open Women's Tennis
Sep 19 US National Championship Women's Tennis, Forest Hills, NY: Margaret Osborne duPont wins first of 3 straight US singles crowns; beats Louise Brough Clapp 4-6, 6-4, 15-13
- Sep 20 Heitor Villa-Lobos' folk operetta "Magdalena" opens at Ziegfeld Theater, NYC; runs for 88 performances
- Sep 20 Mexican Baseball league disbanded
Texaco Star Theater
Sep 21 Milton Berle becomes the permanent host on NBC's TV show "Texaco Star Theater"
- Sep 23 Braves clinch NL pennant
- Sep 24 Mildred Gillars (Axis Sally), an American broadcaster employed by the Third Reich in Nazi Germany to proliferate propaganda during World War II, pleads not guilty to eight chargs of treason in Washington, D.C.
- Sep 24 MLB NY Yankees, Boston Red Sox & Cleveland Indians are all tied for 1st place in AL (91-56)
- Sep 24 The Honda Motor Company is founded in Hamamatsu-city, Japan
- Sep 25 "Heaven on Earth" closes at Century Theater NYC after 12 performances
- Sep 26 Boston Braves win 1st NL championship since 1914
- Sep 28 WBAP-TV, (NBC affiliate) Fort Worth Texas, begins broadcasting
Hamlet
Sep 29 "Hamlet" directed by and starring Laurence Olivier's opens at Park Avenue Cinema (Best Picture 1949)
- Sep 29 WBAP (now KXAS) TV channel 5 in Fort Worth-Dallas, TX (NBC) begins
- Sep 29 WSB TV channel 2 in Atlanta, GA (ABC) begins broadcasting