Residents returning home Wednesday said they were nervous about what they will find.
"You can expect that - unfortunately - to continue intensifying in California and throughout the Southwest".
"We're in for a really rough ride", Brown said at the news conference.
The largest of them, the Carr Fire north of Sacramento near the city of Redding, has burned for more than a week and engulfed almost 190 square miles.
Authorities have reopened more evacuated neighborhoods as ground crews, aided by diminished winds, extended buffer lines carved out of thick, dry brush along the fire's edge to 35 percent of its perimeter, officials said.
Six people, including two firefighters, have died, and the fire has destroyed 1,058 homes and almost 500 other buildings, including barns and warehouses, making it the sixth most destructive wildfire in California history, state fire officials said. "We're part of that process of the Mediterranean climate that is being impacted by the changing weather".
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Brown said that only a month into the current budget year California has already spent $125 million, a quarter of its fire budget. "For instance, past year we had the floods so we brought lots of resources from the outside", San Jose Fire Captain Mitch Matlow said.
"We're in for a really rough ride, and it's going to get expensive, it's going to get unsafe", Brown said.
More than 1,000 families have lost their homes, their prized possessions.
Watch an aerial video of the California fires. "It's not going away, so we have to learn to live with it", Cal Fire Director Ken Pimlott said Wednesday in an interview, according to The Sacramento Bee. "Despite progress, the fires were only 12 percent contained".
Officials say 20 people who had been reporting missing in California's devastating wildfires are now accounted for.