Flood Fatalities: September 2008 Monthly Total: 18 Vehicle Related: 6
| Day | State | County | Gender | Age | Circumstances |
| 1 | PR | Northeast | F | 22 | Group of hikers overtaken by flash flood, 2 swept away and drowned |
| M | 25 | ||||
| 6 | CT | Fairfield | M | 48 | Homeless man swept away into flooded river from his home under a bridge |
| 6 | SC | Georgetown | M | 20 | Man drove into flooded drainage ditch and drowned while attempting to exit the vehicle |
| 10 | UT | Garfield | M | 60 | Flash flood in slot canyon swept 2 persons away |
| F | 60 | ||||
| 12 | KS | Sedgwick | M | 64 | Stalled motorist attempted to leave vehicle and swept away |
| 13 | KS | Sumner | M | 47 | Volunteer firefighter with others worked to rescue teens stranded as rafting down flooded river. Lost his balance and was swept down river and drowned |
| 13 | IL | Cook | M | 28 | Attempted to swim across flooded retention basin and drowned |
| 13 | IL | Cook | M | 83 | Elderly man fell head first into a flooded window well and drowned as he was trying to clear a plugged drain in the well. |
| 13 | MO | Boone | F | 20 | Woman attempted to help a motorist swept off road into a creek - against advice of a friend. She was swept away by flood waters. |
| 14 | IN | Porter | M | 48 | Men sucked into culvert while attempting to rescue a boy - the men drowned but the boy survived. |
| M | 78 | ||||
| 14 | MO | St. Louis | F | 64 | Drowned while trying to move their vehicles away from rising flood waters |
| M | 81 | ||||
| 21 | PR | Southeast | M | 44 | Victim swept under vehicle by flooded river currents and drowned |
| 21 | PR | Eastern Interior | M | 52 | Motorist swept away while attempting to cross flooded bridge. |
| 23 | PR | Ponce and Vicinity | M | 29 | Victim swept off low bridge as he attempted to cross it on foot |