1998 Seattle Mariners season Game log August

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| August 12 | @ Toronto Blue Jays | 5-11 | Ayala (1-8) | 39139 | 54-64 |
| August 14 | @ Chicago White Sox | 2-14 | Cloude (7-8) | 22713 | 54-65 |
| August 15 | @ Chicago White Sox | 13-7 | Navarro (8-14) | 21537 | 55-65 |
| August 16 | @ Chicago White Sox | 3-5 | Fassero (10-9) | 25471 | 55-66 |
| August 17 | Detroit Tigers | 3-1 | Moehler (12-9) | 38639 | 56-66 |
| August 18 | Detroit Tigers | 6-7 | Ayala (1-9) | 24136 | 56-67 |
| August 19 | Toronto Blue Jays | 2-16 | Cloude (7-9) | 26258 | 56-68 |
| August 20 | Toronto Blue Jays | 0-7 | Swift (10-7) | 26642 | 56-69 |
| August 21 | Chicago White Sox | 5-4 | Foulke (3-2) | 34421 | 57-69 |
| August 22 | Chicago White Sox | 5-4 | Navarro (8-15) | 43596 | 58-69 |