Mercer County Weather ForecastUnited StatesOHMercer County5477CelinaBecoming Sunny5477Fort RecoveryBecoming Sunny5478RockfordBecoming Sunny5477ColdwaterBecoming SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns