This is what my SLO Co forecaster had to say:
“This cold front will be strengthened by upper-level winds and will move through the Central Coast Sunday morning with increasing clouds, southerly winds and moderate rain. Frontal passage will occur between 8 a.m. and 12 noon, followed by widely scattered rain showers, increasing northwesterly winds and cooler air temperatures Sunday afternoon and night.
Total rainfall amounts will range between a quarter and a half an inch for much of the Central Coast. This system will also produce snow for the Sierra Nevada above 4,000 feet.” He also hints at another system next weekend, the 21st.
Here are a couple rain prediction maps from NOAA: