Mercer County Weather ForecastUnited StatesOHMercer County7092CelinaMostly Sunny7091Fort RecoveryMostly Sunny7092RockfordMostly Sunny7091ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns