- September 1, 1985 (This strip is adapted in the episode "Word of Mouth" from the 2014 French TV series Peanuts)
- September 2, 1985
- September 3, 1985
- September 4, 1985
- September 5, 1985
- September 6, 1985
- September 7, 1985
- September 8, 1985
- September 9, 1985
- September 10, 1985
- September 11, 1985
- September 12, 1985
- September 13, 1985
- September 14, 1985 (The day that the episode "Snoopy and the Giant" from The Charlie Brown and Snoopy Show first aired)
- September 15, 1985
- September 16, 1985
- September 17, 1985
- September 18, 1985
- September 19, 1985
- September 20, 1985
- September 21, 1985 (The day that the episode "Snoopy's Brother Spike" from The Charlie Brown and Snoopy Show first aired)
- September 22, 1985
- September 23, 1985
- September 24, 1985
- September 25, 1985
- September 26, 1985
- September 27, 1985 (This strip is adapted in A Charlie Brown Valentine)
- September 28, 1985 (The day that the episode "Snoopy's Robot" from The Charlie Brown and Snoopy Show first aired)
- September 29, 1985
- September 30, 1985 (The fourth time Marcie is seen without her glasses)
| ← August 1985 | October 1985 → |