Mercer County Weather ForecastUnited StatesOHMercer County5572CelinaPartly Sunny5571Fort RecoveryMostly Sunny5572RockfordMostly Sunny5572ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns