Mercer County Weather ForecastUnited StatesOHMercer County6785CelinaMostly Sunny6784Fort RecoveryMostly Sunny6785RockfordMostly Sunny6785ColdwaterBecoming SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns