Eight people were injured as a rogue wave swamped people and vehicles in the city of Ventura.
Storms in the Pacific have brought huge waves to the Californian coast.
Water crashed over the sea wall, sweeping people off their feet, and washing vehicles away in Ventura, Santa Cruz.
At the north end of Monterey Bay, in Aptos, CCTV showed seawater washing into a beach restaurant.
Several beaches in the state remain closed, with more windy weather forecast for the weekend.