Mercer County Weather ForecastUnited StatesOHMercer County6784CelinaBecoming Sunny6784Fort RecoveryDecreasing Clouds6784RockfordPartly Sunny6784ColdwaterIncreasing CloudsCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns