- Sep 1 Albania becomes a kingdom, with Zogu I as king
- Sep 7 Sophie Treadwell's "Machinal" premieres in NYC
- Sep 9 Silvio Cator of Haiti, sets then long jump record at 26' ½"
- Sep 11 1st ever TV drama WGY's "Queens Messenger" broadcast in the New York area starring Izetta Jewell
- Sep 11 Ty Cobb last hitting appearance, pops out against Yankees
- Sep 12 -17] Hurricane in Florida, kills 6,000
Film & TV History
Sep 12 Katharine Hepburn's NYC stage debut in "Night Hostess"
Scientific Discovery
Sep 15 Scottish bacteriologist Alexander Fleming discovers penicillin while studying influenza
- Sep 15 St. Louis Cardinals set NL record of 18 men left-on-base; still beat Phillies, 8-6 at the Baker Bowl, Philadelphia
- Sep 15 Stothard, Kalmar & Ruby's musical "Good Boy" premieres in NYC
- Sep 15 Kent leg-spinner Alfred "Tich" Freeman takes 2-102 and 4-75 for Rest of England vs Lancashire to become the only bowler to take 300 wickets (304) in an English cricket season
- Sep 16 Hurricane hits West Palm Beach-Lake Okeechobee Florida; 3,000 die
- Sep 17 Hurricane hits Lake Okeechobee Florida drowning 1,800-2500
- Sep 17 Pitcher Ray Boggs hits 3 batters in 1 inning
- Sep 17 US National Championship Men's Tennis: Frenchman Henri Cochet wins his only US title; beats American Frank Hunter 4-6, 6-4, 3-6, 7-5, 6-3
- Sep 18 St. Louis beat Phillies, 4-2 at the Baker Bowl, Philadelphia; 20th Cards' win of 22 starts between the 2 clubs in 1928
- Sep 18 Juan de la Cierva flies 1st helicopter above Channel
- Sep 21 "My Weekly Reader" magazine made its debut
- Sep 24 Cohan and Lardner's musical "Elmer the Great" premieres in NYC
- Sep 27 The Nationalist Republic of China is recognised by the United States.
- Sep 28 1st recording session in Nashville (Warmack's Gully Jumpers)
- Sep 28 Juan de la Cierva makes 1st helicopter flight over English Channel
- Sep 28 NY Yanks clinch pennant #6
Historic Event
Sep 28 Prussia forbids speech from Adolf Hitler
Historic Event
Sep 28 US acknowledge Chinese government of Chiang Kai-shek
- Sep 30 Leon Vanderstuyft of Belgium cycles record 76 mi 604 yds in 1 hr