© AFP Photo/Justin SullivanFrefighters train in June 2017 in California
Some 3,000 firefighters were battling several blazes with triple-digit temperatures recorded in valleys and inland areas.
A wildfire in the Sierra Nevada foothills north of Sacramento was only two percent contained by early evening and had destroyed 10 homes, scorching 2,000 acres (800 hectares) of forest and sparking evacuations and road closures.
The California Department of Forestry and Fire Protection (CalFire) said five residents and a firefighter had sustained minor injuries.
Meanwhile a blaze that forced evacuations in San Luis Obispo County tripled in size from Saturday morning to 19,000 acres by the evening. Fanned by hot, dry winds, it was just 10 percent contained, CalFire said.
Some 17 wildfires in various states of containment were burning in California Saturday, from the Six Rivers National Forest in the north to the San Bernardino Forest east of Los Angeles.
An excessive heat warning has been extended until 11:00 pm (0600 GMT) for much of southern California, with temperature records being broken across the region.
Comment: From RT:
The wildfires temporarily trapped at least 90 children and some 50 councilors at a local summer camp, Zaniboni said, adding that later the campers had been safely evacuated.
On Saturday, the blaze dubbed the Alamo Fire burned more than 23 square kilometers outside Santa Maria and remained 10 percent contained, Zaniboni added. The Santa Barbara blaze is one of three separate wildfires that have rocked California.
Some 300 residents were to evacuate Santa Barbara and neighboring San Luis Obispo County, AP reported.