Mercer County Weather ForecastUnited StatesOHMercer County6280CelinaMostly Cloudy6279Fort RecoveryMostly Cloudy6280RockfordPartly Sunny6279ColdwaterMostly CloudyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns