Mercer County Weather ForecastUnited StatesOHMercer County3548CelinaBecoming Sunny3648Fort RecoveryBecoming Sunny3548RockfordBecoming Sunny3548ColdwaterBecoming SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns