|| @ Cardinals || 3–2 || Shane Rawley (6–6) || Danny Cox (5–9) || Al Holland (23) || 23,961 || 57–48 |- style="background:#fbb" | 106 || August 3 || @ Cardinals || 3–4 || Ricky Horton (6–1) || Jerry Koosman (12–8) || Bruce Sutter (28) || 26,771 || 57–49 |- style="background:#fbb" | 107 || August 4 || @ Cardinals || 2–3 || Dave LaPoint (8–9) || Larry Andersen (1–2) || Bruce Sutter (29) || 38,256 || 57–50 |- style="background:#bfb" | 108 || August 5 || @ Cardinals || 6–3 || Bill Campbell (4–3) || Jeff Lahti (3–2) || Al Holland (24) || 42,114 || 58–50 |- style="background:#bfb" | 109 || August 6 || @ Expos || 4–1 || Steve Carlton (10–5) || Charlie Lea (14–7) || None || 32,349 || 59–50 |- style="background:#bfb" | 110 || August 7 (1) || @ Expos || 6–2 || Shane Rawley (7–6) || Bryn Smith (9–10) || Al Holland (25) || see 2nd game || 60–50 |- style="background:#fbb" | 111 || August 7 (2) || @ Expos || 2–3 || Jeff Reardon (5–4) || Bill Campbell (4–4) || None || 39,271 || 60–51 |- style="background:#fbb" | 112 || August 8 || @ Expos || 1–3 || Bill Gullickson (7–7) || Jerry Koosman (12–9) || Jeff Reardon (15) || 25,244 || 60–52 |- style="background:#bfb" | 113 || August 9 || Cardinals || 2–1 (13) || Bill Campbell (5–4) || Dave Rucker (1–2) || None || 27,676 || 61–52 |- style="background:#fbb" | 114 || August 10 || Cardinals || 0–3 (10) || Bruce Sutter (4–3) || Larry Andersen (1–3) || None || 25,824 || 61–53 |- style="background:#bfb" | 115 || August 11 || Cardinals || 6–1 || Steve Carlton (11–5) || Joaquín Andújar (15–11) || None || 30,413 || 62–53 |- style="background:#bbb" | – || August 12 || Cardinals || colspan=6 | Postponed (rain); Makeup: September 12 as a traditional double-header |- style="background:#fbb" | 116 || August 14 || @ Padres || 2–3 || Eric Show (12–7) || Jerry Koosman (12–10) || Craig Lefferts (8) || 23,799 || 62–54 |- style="background:#fbb" | 117 || August 15 || @ Padres || 3–4 || Rich Gossage (7–4) || Al Holland (5–7) || None || 21,078 || 62–55 |- style="background:#bfb" | 118 || August 16 || @ Padres || 8–3 || John Denny (5–3) || Andy Hawkins (7–5) || None || 23,125 || 63–55 |- style="background:#fbb" | 119 ||