None || 36,530 || 50–73–1 |- style="background:#fbb" | 125 || August 21 || Padres || 2–8 || Dennis Rasmussen (6–9) || Don Carman (4–13) || None || 17,467 || 50–74–1 |- style="background:#bfb" | 126 || August 22 || Padres || 4–2 || Ken Howell (10–9) || Mark Grant (5–2) || Roger McDowell (15) || 21,419 || 51–74–1 |- style="background:#fbb" | 127 || August 23 || Padres || 3–7 || Andy Benes (1–2) || Bruce Ruffin (3–8) || None || 20,455 || 51–75–1 |- style="background:#bfb" | 128 || August 25 || @ Dodgers || 3–2 || Terry Mulholland (4–5) || Ramón Martínez (3–2) || Jeff Parrett (6) || 33,541 || 52–75–1 |- style="background:#fbb" | 129 || August 26 || @ Dodgers || 0–4 || Tim Belcher (10–12) || Dennis Cook (5–6) || None || 42,000 || 52–76–1 |- style="background:#fbb" | 130 || August 27 || @ Dodgers || 1–8 || Fernando Valenzuela (9–12) || Don Carman (4–14) || None || 28,496 || 52–77–1 |- style="background:#bfb" | 131 || August 28 || @ Giants || 9–1 || Ken Howell (11–9) || Rick Reuschel (15–6) || None || 15,614 || 53–77–1 |- style="background:#bfb" | 132 || August 29 || @ Giants || 6–1 || Bruce Ruffin (4–8) || Don Robinson (11–9) || Roger McDowell (16) || 13,952 || 54–77–1 |- style="background:#fbb" | 133 || August 30 || @ Giants || 2–3 || Kelly Downs (3–5) || Terry Mulholland (4–6) || Steve Bedrosian (18) || 19,053 || 54–78–1 |- style="background:#fbb" | 134 || August 31 || @ Padres || 1–5 || Dennis Rasmussen (8–9) || Don Carman (4–15) || Mark Grant (2) || 15,541 || 54–79–1 |- style="background:#fbb" | 135 || September 2 || @ Padres || 2–3 || Bruce Hurst (13–9) || Ken Howell (11–10) || Mark Davis (33) || 23,161 || 54–80–1 |- style="background:#fbb" | 136 || September 3 || @ Padres || 5–9 || Andy Benes (3–2) || Dennis Cook (5–7) || Mark Davis (34) || 24,956 || 54–81–1 |- style="background:#fbb" | 137 || September 4 || Pirates || 5–7 || Bob Patterson (1–1) || Mike Maddux (1–3) || Bill Landrum (22) || 13,317 || 54–82–1 |- style="background:#bfb" | 138 || September 5 || Pirates || 3–2 || Jeff Parrett (12–4) || Bob Patterson (1–2) || None || 12,484 || 55–82–1 |- style="background:#bfb" | 139 || September 6 || Cubs || 9–1 || Bruce Ruffin (5–8) || Greg Maddux (16–11) ||