Friday:The San Andreas forecast for Apr 14 is 54 degrees and Sunny. There is 56 percentage chance of rain and 8 mph winds from the Northwest. Saturday:The San Andreas forecast for Apr 15 is 59 degrees and Cloudy. There is 48 percentage chance of rain and 5 mph winds from the West. Sunday:The San Andreas forecast for Apr 16 is 59 degrees and Light rain. There is 56 percentage chance of rain and 4 mph winds from the South-Southwest.