Lindbergh Visits Idaho
Sep 4 Charles Lindbergh visits Boise, Idaho, on his cross-country tour
- Sep 6 Buddy DeSylva & Lew Brown's musical "Good News" opens at The 46th Street Theatre, NYC; runs for 557 performance
- Sep 7 Philo Farnsworth demonstrates the first use of his electronic television in San Francisco
- Sep 7 University of Minas Gerais founded in Belo Horizonte, Brazil, by Governor Antônio Carlos
Tony Lazzeri Day
Sep 9 Tony Lazzeri Day at Yankee Stadium
International Lawn Tennis Challenge
Sep 10 International Lawn Tennis Challenge, Philadelphia, PA: Henri Cochet beats Bill Johnson 6-4, 4-6, 6-2, 6-4 to clinch a 3-2 win for France and break 7 title US win streak
- Sep 11 After losing 21 in a row to NY, the Browns win their last meeting, 6-2
- Sep 12 Sigmund Romberg's musical "My Maryland," premieres in NYC
- Sep 13 NY Yankees clinch AL pennant after 5-3 win over Cleveland Indians at Yankee Stadium; Babe Ruth hits HR #52 en route to MLB record 60
- Sep 17 Charles Lindbergh visits San Francisco
US Men's Tennis Open
Sep 17 US National Championship Men's Tennis, Forest Hills NY: Frenchman Rene Lacoste successfully defends title; beats Bill Tilden 11-9, 6-3, 11-9
- Sep 18 The Columbia Broadcasting System goes on the air. with 18 stations (and WOR as NYC affiliate)
The Long Count Fight
Sep 22 "The long count" - in a famous boxing rematch, Gene Tunney beats Jack Dempsey by 10-round unanimous decision at Soldiers Field, Chicago to retain world heavyweight title; crowd 104,943; gate $2,858,660
- Sep 22 New York Yankees Earle Coombs hits 3 triples
Sunrise: A Song of Two Humans
Sep 23 "Sunrise: A Song of Two Humans", directed by F. W. Murnau, starring George O'Brien and Janet Gaynor, is released (Academy Awards Unique and Artistic Picture 1927)
- Sep 24 New York Yankees set a record of 106 victories
- Sep 24 NHL's Toronto St Patricks become Maple Leafs
- Sep 26 St James Theater (Erlanger) opens at 246 W 44th St, NYC
- Sep 29 Telephone service begins between US & Mexico
- Sep 29 Tornado strikes St Louis, Missouri, 85 die
- Sep 29 Yankees slugger Babe Ruth ties MLB record by hitting grand slams in consecutive games; New York's 7-4 win v Philadelphia A's and 15-4 rout of Washington Senators
- Sep 30 Yankees slugger Babe Ruth smacks his MLB record 60th home run off Tom Zachary in 8th inning of New York's 4-2 win over Washington Senators at Yankee Stadium
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