This is what NOAA has to say:
THE NEXT IMPULSE IS EXPECTED TO BRING LIGHT SHOWERS TO THE AREA ON SATURDAY WITH A STRONGER SYSTEM PROGGED FOR SUNDAY. THE SUNDAY SYSTEM COULD SPREAD UP TO AN INCH OF RAIN…POSSIBLY HIGHEST ALONG THE BIG SUR COAST…FROM LATE IN THE DAY SUNDAY THROUGH SUNDAY NIGHT.
And this is the forecast for the SLO area:
A 1,003 millibar surface low pressure system is forecast to develop about 200 miles west San Luis Obispo tonight. This surface low is expected to move towards our area on Saturday and will produce fresh to strong (19 and 31 mph) southeasterly winds along the coastline on Saturday along with widely scattered sprinkles and rain showers.
The associated cold front is forecast to pass the Central Coast Sunday evening with strong to gale force (25 and 38 mph southeasterly winds along the coastline and moderate rain. Rain will turn to showers late Sunday night, ending by Monday morning.