Mercer County Weather ForecastUnited StatesOHMercer County3040CelinaMostly Cloudy3139Fort RecoveryMostly Cloudy3039RockfordMostly Cloudy3040ColdwaterMostly CloudyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns