Mercer County Weather ForecastUnited StatesOHMercer County4068CelinaMostly Sunny3968Fort RecoveryMostly Sunny3968RockfordMostly Sunny4068ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns