Mercer County Weather ForecastUnited StatesOHMercer County3147CelinaMostly Sunny3148Fort RecoveryMostly Sunny3147RockfordMostly Sunny3147ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns