This year's Tour de France has been plagued with bad weather, including a hailstorm; officials called off the rest of Stage 19 with about 18.5 miles to go.
Many areas in the north of the state received several inches of rain.
On Monday, the first of a series of Pacific storms pounded the region, much of which has already been reduced to scorched bare earth inflicted by wildfires.
Mandatory evacuations are in place in some areas of California affected by recent wildfires because of the risk of mudslides and debris flows.
Flood warnings have also been issued for several locations in L.A. and Ventura counties.
Emergency alerts for the dangerous mudslides in California were sent to cell phones after they began in Montecito County.
Mudslides swamped southern California after heavy rains.
In minutes the rain storm sent boulders tumbling down slopes towards residential areas.
There are over 180 people dead and 160 others missing after tropical storm Tebin hit the Philippines on Friday.
Emergency services call it one of the worst mudslides to hit the impoverished Central American country in recent memory.
Rising temperatures have caused an environmental disaster, according to the IOM.