Mercer County Weather ForecastUnited StatesOHMercer County5173CelinaMostly Sunny5072Fort RecoveryMostly Sunny5173RockfordMostly Sunny5173ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns