Mercer County Weather ForecastUnited StatesOHMercer County7488CelinaPartly Sunny7488Fort RecoveryPartly Sunny7389RockfordMostly Cloudy7388ColdwaterMostly CloudyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns