Mercer County Weather ForecastUnited StatesOHMercer County3052CelinaBecoming Sunny3152Fort RecoveryBecoming Sunny2952RockfordBecoming Sunny3052ColdwaterMostly SunnyCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns