FPUS42 KILM 251954 City Forecast for North Myrtle Beach, SC Issued Wednesday afternoon - Nov 25, 2009 .Wednesday night... Low 46, 10% chance of precipitation. .Thursday... Partly cloudy, high 68, 10% chance of precipitation. .Thursday night... Low 41, 10% chance of precipitation. .Friday... Sunny, high 57. .Friday night... Low 37.