Mercer County Weather ForecastUnited StatesOHMercer County3143CelinaDecreasing Clouds3144Fort RecoveryMostly Sunny3143RockfordMostly Sunny3143ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns