Mercer County Weather ForecastUnited StatesOHMercer County5274CelinaMostly Sunny5275Fort RecoveryMostly Sunny5175RockfordMostly Sunny5274ColdwaterIncreasing CloudsCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns