FPUS42 KFFC 030749 City Forecast for Gainesville, GA Issued Wednesday morning - Oct 3, 2018 .Wednesday... Partly cloudy, high 85, 10% chance of precipitation. .Wednesday night... Low 67, 5% chance of precipitation. .Thursday... Sunny, high 87, 10% chance of precipitation. .Thursday night... Low 68. .Friday... High 88.