0am:The Harrisburg, NC forecast for Apr 06 is 63 degrees and Light rain shower. There is 81 percentage chance of rain and 9 mph winds from the South-Southwest. 3am:The Harrisburg, NC forecast for Apr 06 is 60 degrees and Patchy light rain with thunder. There is 90 percentage chance of rain and 9 mph winds from the South-Southwest. 6am:The Harrisburg, NC forecast for Apr 06 is 59 degrees and Clear. There is 86 percentage chance of rain and 14 mph winds from the Southwest.