- 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 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 Men's National Tennis Championship, Forest Hills NY: Bill Tilden wins 6 straight US titles; beats Bill Johnston for 4th straight year 4-6, 11-9, 6-3, 4-6, 6-3
- Sep 22 Yank Ben Paschal hits 2 inside-the-park-homers
- Sep 23 George Kaufman's "Butter & Egg Man" premieres in NYC
- Sep 23 Washington shortstop Roger Peckinpaugh is named AL MVP
Golf Major
Sep 26 8th PGA Championship: Walter Hagen wins at Olympia Fields, Illinois
Walter Hagen