- Sep 3 American yacht Reliance (largest gaff-rigged cutter ever built) defends America's Cup for the NYYC beating UK challenger Shamrock III off the New Jersey shore for a 3-0 series win
- Sep 6 Start of Sherlock Holmes "Adventure of Creeping Man" (BG)
- Sep 7 Federation of American Motorcyclists organized in NY
- Sep 9 6 km long Engadin-railroad tunnel in Switzerland inaugurated
- Sep 11 The first race at The Milwaukee Mile in West Allis, Wisconsin is held. It is the oldest major speedway in the world.
- Sep 14 NY Giant Red Ames no-hits St Louis, 5-0 in a 5 inning game
- Sep 15 Queen Wilhelmina calls railroad strikers "criminals"
- Sep 17 Boston Pilgrims clinch AL pennant, beating Cleveland, 14-3
- Sep 18 Phillies' Chick Fraser no-hits Chicago Cubs, 10-0
- Sep 19 King Leopold II denies Belgian cruelty in Congo
- Sep 21 First cowboy film "Kit Carson" premieres in US
- Sep 22 Italo Marchiony granted patent for ice cream cone
- Sep 24 Alfred Deakin succeeds Edmund Barton as Australia premier
- Sep 24 Bill Bradley becomes 1st Cleveland baseball player (Cleveland Naps) to hit for cycle
- Sep 27 Wreck of the Old 97, a train crash made famous by the song of the same name.
- Sep 30 New Gresham's School officially opened by Field Marshal Sir Evelyn Wood.