- Sep 1 A murder conviction effectively forces the violent Irish anti-owner coal miners, the "Molly Maguires", to disband
- Sep 9 Lotta's Fountain (Kearny & Market) dedicated
- Sep 10 British Open Golf, Prestwick GC: Willie Park Sr. wins his 4th title; beats fellow Scot Bob Martin by 2 strokes
- Sep 11 1st newspaper cartoon strip
- Sep 29 US-Spanish relations decline in wake of Cuban rebellion