The National Weather Service weekend forecast for Marion County and beyond calls for some seriously chilly overnight temperatures. MARION COUNTY, FL (352today.com) – According to the National Weather Service, the cold nights will continue through the weekend in the 352, with shelters open in most counties after Friday night. Otherwise, mostly sunny, with a high near 69. Saturday, Jan. 31Day: Mostly sunny, with a high near 54. Sunday, Feb. 1Day: Sunny, with a high near 45.