Mercer County Weather ForecastUnited StatesOHMercer County4046CelinaMostly Cloudy4046Fort RecoveryMostly Cloudy4045RockfordMostly Cloudy4046ColdwaterMostly CloudyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns