Officials say at least three people have died in the catastrophic flooding over the Christmas period.
The storms which continued into Friday brought 6 inches (15 cm) of rainfall to Los Angeles County, with up to 18 inches recorded in the mountains, prompting evacuations and closing major roads.
More than 50,000 people in the state are still without power as efforts to restore service continue on Friday.
The US National Weather Service warned on Friday that "the potential for flooding will be high", though showers will taper off as the day goes on.
