1984 Chicago Cubs season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 1 | @ Braves | 4 - 1 | McMurtry (8-14) | 28821 | 81-54 |
| September 2 | @ Braves | 4 - 2 | Mahler (9-9) | 26106 | 82-54 |
| September 3 | @ Phillies | 4 - 3 | Martin (1-2) | 28162 | 83-54 |
| September 4 | @ Phillies | 7 - 2 | Carlton (11-7) | 25054 | 84-54 |
| September 5 | @ Expos | 3 - 1 | Trout (12-6) | 12623 | 84-55 |
| September 6 | @ Expos | 4 - 1 | Lea (15-10) | 13089 | 85-55 |
| September 7 | @ Mets | 10 - 0 | Ruthven (5-10) | 46301 | 85-56 |
| September 8 | @ Mets | 6 - 0 | Terrell (10-11) | 42810 | 86-56 |
| September 9 | @ Mets | 5 - 1 | Frazier (5-3) | 34956 | 86-57 |