Mercer County Weather ForecastUnited StatesOHMercer County4366CelinaMostly Sunny4466Fort RecoveryMostly Sunny4366RockfordMostly Sunny4366ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns