Mercer County Weather ForecastUnited StatesOHMercer County3179CelinaRain Showers3281Fort RecoveryRain Showers3178RockfordRain Showers3280ColdwaterRain ShowersCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns