FPUS42 KCAE 230748 City Forecast for Shaw Afb Sumter, SC Issued Friday morning - Mar 23, 2012 .Friday... Sunny, high 83, 20% chance of precipitation. .Friday night... Low 51, 80% chance of precipitation. .Saturday... Sunny, high 64, 0% chance of precipitation. .Saturday night... Low 32. .Sunday... High 67.