- Sep 2 Marcus Ericsson, Swedish auto racer (Indianapolis 500 2022; Formula BMW UK 2007; All-Japan Formula 3 C'ship 2009), born in Kumla, Sweden
- Sep 4 James Bay, British singer-songwriter (Chaos and the Calm), born in Hitchin, Hertfordshire, England
- Sep 5 Jeremy Snider, American actor (Eric Jr-Bold & Beautiful), born in California
- Sep 5 Kim Yu-Na, Korean figure skater, born in Wonmi-gu, South Korea
- Sep 6 John Wall, American basketball point guard (2010 NBA Draft: #1 pick Washington Wizards), born in Raleigh, North Carolina
- Sep 7 Tanja Kolbe, German ice dancer, born in Berlin, Germany
- Sep 8 Gerrit Cole, American MLB player (NY Yankees), born in Newport Beach, California
- Sep 8 Jos Buttler, English cricket wicketkeeper (HS 152; Somerset CCC, Lancashire CCC, Rajasthan Royals, Sydney Thunder), born in Taunton, England
- Sep 8 Matt Barkley, American NFL football quarterback (Buffalo Bills), born in Newport Beach, California
- Sep 8 Matthew Dellavedova, Australian basketball player (Cleveland Cavaliers), born in Maryborough, Australia
- Sep 9 Magnus Larsson, Danish rock bassist (Lukas Graham - "7 Years"), born in Denmark
- Sep 9 Melody Klaver, Dutch actress, born in Amsterdam, Netherlands
- Sep 9 Shaun Johnson, New Zealand Rugby League halfback (Auckland Warriors, Cronulla Sharks), born in Auckland, NZ
- Sep 10 Chandler Massey, American actor (Days of our Lives), born in Atlanta, Georgia
- Sep 14 Douglas Costa, Brazilian footballer (Juventus), born in Sapucaia do Sul, Brazil
- Sep 14 Paula Carregosa, Brazilian heavy metal guitarist (Detonator, Panndora), born in São Paulo, Brazil
John Tavares (32 years old)
Sep 20 Canadian ice hockey player (New York Islanders), born in Mississauga, Ontario
- Sep 20 Marilou [Bourdon], Canadian pop singer and cookbook author (Three Times a Day), born in Longueuil, Quebec
- Sep 21 Allison Scagliotti, American actress
- Sep 21 Christian Serratos, American actress
- Sep 21 Rob Cross, English darts player (PDC World Champion 2018), born in Pembury, England
- Sep 25 Mao Asada, Japanese figure skater, born in Nagoya, Japan
- Sep 27 Kylee Lin, American beauty pageant winner
About September 1990
How Old? 32 years old
Generation: Millennial
Leap Year: No