Mercer County Weather ForecastUnited StatesOHMercer County5679CelinaBecoming Sunny5578Fort RecoveryBecoming Sunny5679RockfordBecoming Sunny5678ColdwaterBecoming SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns