Mercer County Weather ForecastUnited StatesOHMercer County318CelinaChance Flurries317Fort RecoveryChance Flurries318RockfordChance Flurries318ColdwaterChance FlurriesCarthagenaCelinaChickasawColdwaterEastview ParkFort RecoveryGrand Lake Saint Marys State ParkGrand Lake St Marys SPBHamrick AirportLakefield AirportMaria SteinMendonMercer Wildlife AreaMontezumaMontezuma BayMulholland AirportRockfordSt HenrySt Johns