1999 Toronto Blue Jays season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 12 | @ Tigers | 5 - 3 | Weaver (8-11) | 39349 | 76-68 |
| September 13 | Yankees | 2 - 1 | Hernández (16-8) | 30118 | 77-68 |
| September 14 | Yankees | 10 - 6 | Koch (0-4) | 29140 | 77-69 |
| September 15 | Yankees | 6 - 4 | Hentgen (10-11) | 29460 | 77-70 |
| September 17 | White Sox | 7 - 3 | Escobar (12-11) | 30743 | 77-71 |
| September 18 | White Sox | 7 - 4 | Quantrill (2-2) | 28260 | 77-72 |
| September 19 | White Sox | 3 - 2 | Halladay (8-7) | 27120 | 77-73 |
| September 21 | @ Red Sox | 3 - 0 | Hentgen (10-12) | 27799 | 77-74 |
| September 22 | @ Red Sox | 14 - 9 | Rapp (6-7) | 25345 | 78-74 |
| September 23 | @ Red Sox | 7 - 5 | Beck (0-1) | 30780 | 79-74 |