NWS Jacksonville » Climate Page » Jacksonville Normals for September
| JAX | August Normals | September Normals | October Normals |
| August Records | September Records | October Records |
| Jacksonville Normals for September | |||||||
| Day | High | Low | Avg | Pcpn | Year To Date | HDD | CDD |
| 01 | 89 | 72 | 81 | 0.28 | 35.64 | 00 | 16 |
| 02 | 89 | 72 | 81 | 0.29 | 35.93 | 00 | 15 |
| 03 | 89 | 72 | 80 | 0.29 | 36.22 | 00 | 15 |
| 04 | 89 | 72 | 80 | 0.29 | 36.51 | 00 | 15 |
| 05 | 89 | 72 | 80 | 0.29 | 36.80 | 00 | 15 |
| 06 | 89 | 71 | 80 | 0.29 | 37.09 | 00 | 15 |
| 07 | 88 | 71 | 80 | 0.29 | 37.38 | 00 | 15 |
| 08 | 88 | 71 | 80 | 0.28 | 37.66 | 00 | 15 |
| 09 | 88 | 71 | 80 | 0.27 | 37.93 | 00 | 14 |
| 10 | 88 | 71 | 79 | 0.27 | 38.20 | 00 | 14 |
| 11 | 88 | 71 | 79 | 0.27 | 38.47 | 00 | 14 |
| 12 | 88 | 71 | 79 | 0.28 | 38.75 | 00 | 14 |
| 13 | 88 | 70 | 79 | 0.28 | 39.03 | 00 | 14 |
| 14 | 87 | 70 | 79 | 0.29 | 39.32 | 00 | 14 |
| 15 | 87 | 70 | 79 | 0.29 | 39.61 | 00 | 14 |
| 16 | 87 | 70 | 78 | 0.28 | 39.89 | 00 | 13 |
| 17 | 87 | 70 | 78 | 0.28 | 40.17 | 00 | 13 |
| 18 | 87 | 69 | 78 | 0.28 | 40.45 | 00 | 13 |
| 19 | 87 | 69 | 78 | 0.29 | 40.74 | 00 | 13 |
| 20 | 86 | 69 | 78 | 0.28 | 41.02 | 00 | 13 |
| 21 | 86 | 69 | 77 | 0.26 | 41.28 | 00 | 12 |
| 22 | 86 | 68 | 77 | 0.26 | 41.54 | 00 | 12 |
| 23 | 86 | 68 | 77 | 0.26 | 41.80 | 00 | 12 |
| 24 | 86 | 68 | 77 | 0.26 | 42.06 | 00 | 12 |
| 25 | 85 | 68 | 76 | 0.26 | 42.32 | 00 | 11 |
| 26 | 85 | 67 | 76 | 0.25 | 42.57 | 00 | 11 |
| 27 | 85 | 67 | 76 | 0.26 | 42.83 | 00 | 11 |
| 28 | 85 | 67 | 76 | 0.24 | 43.07 | 00 | 11 |
| 29 | 85 | 66 | 75 | 0.24 | 43.31 | 00 | 10 |
| 30 | 84 | 66 | 75 | 0.24 | 43.55 | 00 | 10 |
| Month | 86.9 | 69.5 | 78.2 | 8.19 | 43.55 | <0.5 | 0396 |
| Season | - | - | - | - | - | <0.5 | 0396 |