2005 Washington Nationals season Game log September

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| September 1 | @ Atlanta Braves | 7-8 (10) | Ayala (8-7) | 19053 | 69-65 |
| September 2 | Philadelphia Phillies | 1-7 | Halama (1-3) | 28939 | 69-66 |
| September 3 | Philadelphia Phillies | 5-4 (12) | López (0-1) | 30561 | 70-66 |
| September 4 | Philadelphia Phillies | 6-1 | Floyd (1-2) | 32251 | 71-66 |
| September 5 | Florida Marlins | 5-2 | Vargas (5-3) | 32150 | 72-66 |
| September 6 | Florida Marlins | 2-4 | Rasner (0-1) | 24.936 | 72-67 |
| September 7 | Florida Marlins | 1-12 | Halama (1-4) | 25702 | 72-68 |
| September 8 | Florida Marlins | 4-8 | Patterson (8-5) | 27625 | 72-69 |
| September 9 | Atlanta Braves | 8-6 | Foster (4-2) | 36295 | 73-69 |
| September 10 | Atlanta Braves | 0-4 | Hernández (15-7) | 44083 | 73-70 |