Mensis September
| Date | Fasti | antiquissimi | Additamenta ex fastis | Additamenta ex scriptoribus | Deity / Deities |
| 1 | F | KALENDAE* | | | JANUS, JUNO |
| 2 | F | | | | |
| 3 | C | | | | |
| 4 | C | | | | |
| 5 | F | NONAE | | | |
| 6 | F | | | | |
| 7 | C | | | | |
| 8 | C | | | | |
| 9 | C | | | | |
| 10 | C | | | | |
| 11 | C | | | | |
| 12 | N | | | | |
| 13 | NP | EIDUS* | Iovi epulum, Feriae Iovi | | JUPITER |
| 14 | F | | | | |
| 15 | N | | | | |
| 16 | C | | | | |
| 17 | C | | | | |
| 18 | C | | | | |
| 19 | C | | | | |
| 20 | C | | | | |
| 21 | C | | | | |
| 22 | C | | | | |
| 23 | C | * | | | |
| 24 | C | | | | |
| 25 | C | | | | |
| 26 | C | | | | |
| 27 | C | | | | |
| 28 | C | | | | |
| 29 | | | | | |
| 30 | C | | | | |