- Sep 2 King Edward VII signs South Africa Act
- Sep 6 Word received that American explorer Robert Peary had discovered the North Pole, 5 months earlier
- Sep 7 Eugene Lefebvre becomes first pilot to die in an airplane craft, while test piloting new French-built Wright biplane at Juvisy
- Sep 9 Jack Johnson fights Al Kaufman to no decision in 10 for boxing title
- Sep 11 Max Wolf rediscovers Halley's comet
- Sep 12 World's first patent for synthetic rubber granted to German chemist Fritz Hofmann
- Sep 17 Denis Peyrony and Louis Capitan discover the skull of an adult male Neanderthal (La Ferrassie 1) during excavations in a rock shelter near La Ferrassie, France
- Sep 18 Largest paid baseball attendance (35,409), A's beat Tigers, 2-0 in Det
- Sep 20 The British Parliament passes the South Africa Act; it calls for union of Cape Colony, Natal, Orange River Colony, and Transvaal; and both English and Dutch as official languages
- Sep 25 Hudson-Fulton Celebration opens in NY
Event of Interest
Sep 27 US President Taft sets aside some 3 million acres of oil-rich public land (including Teapot Dome, Wyoming) for conservation purposes
William Howard Taft