Mehlville received 2.1 inches of rain over the weekend from the remnants of Hurricane Isaac, the St. Louis Post-Dispatch reported Monday.
Rain fell sporadically in the area from Friday to Sunday as the former hurricane moved up from Louisiana and Mississippi.
Fenton received 3.4 inches and the most rain—7.8 inches—fell in Centralia, Ill., according to the National Weather Service.
Forecasts predicted anywhere from 3 to 5 inches in St. Louis.
Rain could continue into this week as the National Weather Service said there's a chance of thunderstorms Tuesday, Wednesday and Friday.