- September 1, 1989
- September 2, 1989
- September 3, 1989 (The quote is popularly associated with the film Casablanca, although those exact words are not spoken in it)
- September 4, 1989
- September 5, 1989
- September 6, 1989 (The satirical comic strip Li'l Abner, in which Peanuts, its creator and its merchandising had been parodied in October 1968, is referenced)
- September 7, 1989
- September 8, 1989
- September 9, 1989
- September 10, 1989
- September 11, 1989
- September 12, 1989
- September 13, 1989
- September 14, 1989
- September 15, 1989
- September 16, 1989
- September 17, 1989
- September 18, 1989
- September 19, 1989
- September 20, 1989
- September 21, 1989 (This strip is used on the page for September 11 of the Dayspring Peanuts A Year's Worth of Smiles and Blessings Desk Calendar)
- September 22, 1989
- September 23, 1989
- September 24, 1989
- September 25, 1989
- September 26, 1989
- September 27, 1989
- September 28, 1989
- September 29, 1989
- September 30, 1989
← August 1989 | October 1989 → |