- Sep 1 Pierre de Coubertin steps down as chairman of International Olympic Committee
- Sep 3 The airship USS Shenandoah (ZR-1) crashes in a storm near Caldwell, Ohio, killing 14, 29 survive
- Sep 5 112 F (44°C), Centerville, Alabama (state record)
- Sep 5 29th US Golf Amateur Championship won by Bobby Jones
- Sep 12 20th Davis Cup: USA beats France in Philadelphia (5-0)
- Sep 12 International Lawn Tennis Challenge, Philadelphia, PA: Vincent Richards & R. Norris Williams clinch US 6th straight title; beat Jean Borotra & René Lacoste of France 6-4, 6-4, 6-3 for 3-0 lead; ends 5-0
- Sep 13 1st US University for African American, Xavier University, opens in New Orleans
- Sep 13 Bkln Dodger Dazzy Vance no-hits Phillies, 10-1
- Sep 19 US National Championship Men's Tennis, Forest Hills NY: Bill Tilden wins 6th consecutive US title; beats Bill Johnston for 4th straight year 4-6, 11-9, 6-3, 4-6, 6-3
- Sep 22 New York left fielder Ben Paschal hits 2 inside-the-park-home runs as the Yankees score an 11-6 home victory over Chicago White Sox
- Sep 23 George Kaufman's "Butter & Egg Man" premieres in NYC
- Sep 23 Washington shortstop Roger Peckinpaugh is named AL MVP
PGA Championship
Sep 26 PGA Championship Men's Golf, Olympia Fields CC: Defending champion Walter Hagen defeats Bill Mehlhorn, 6 & 5 in the final; 3rd PGA crown overall, and 7th of his 11 major titles
Walter Hagen