September 30 is the 273rd day of the year.
- 1961, Saturday: Eric Stoltz (originally planned to play Marty McFly) is born in Whittier, California.
- 1977, Friday: Maia Brewton (Sally Baines) is born in Los Angeles, California.
- 2009, Wednesday: "Terminator - How It Should End", a short video combining Back to the Future and The Terminator, is uploaded to YouTube was uploaded by How It Should Have Ended.
- 2015, Wednesday: Diamond Select releases the board game, Monopoly: Back to the Future Trilogy Edition.