August 31 is the 243rd day of the year (244th in leap years), with 122 days remaining.
- 1951 — Ángel Nieves Díaz is born.
- 1959 — Billy Carroll (victim) is born.
- 1985 — Richard Ramirez is apprehended.
- 1987 — Billy Glaze is apprehended.
- 1995 — Luis Fernando Iribarren is apprehended.
- 2009 — Roman Barkovsky is apprehended.