- Sep 3 US National Championship Men's Tennis, Newport R.I.: Defending champion Henry Slocum defeats Quincy Shaw 6-3, 6-1, 4-6, 6-2
- Sep 5 German Christine Hardt patents the first modern brassiere
- Sep 6 King Kabaka Mwanga of Buganda resigns
- Sep 23 Nintendo Koppai (Later Nintendo Company, Limited) founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda
- Sep 24 Alexander Dey patents dial time recorder
- Sep 28 The first General Conference on Weights and Measures (CGPM) defines the length of a meter as the distance between two lines on a standard bar of an alloy of platinum with ten percent iridium, measured at the melting point of ice
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