A U.S. Forest Service spokesman said more rain and high humidity on Saturday aided firefighters battling the King Fire.
A 400-acre wildfire in Yosemite National Park has prompted the evacuation of about 100 campers, officials said.
Two wildfires sparked by lightning nearly three weeks ago were still growing on Saturday while threatening as many as 250 homes in far Northern California.
Two fires that started within a day of each other in Lassen National Forest expanded into private property and scorched 95 square miles as of Sunday morning, up from 39 square miles a day earlier.
Lightning sparked dozens of fires in Northern California, including one in rural Modoc County that spurred some 120 people to evacuate, and the threat of more strikes along with winds from looming thunderstorms could aggravate the firefight.
A fire that raged in forest land in and around Yosemite National Park has left a contiguous barren moonscape in the Sierra Nevada mountains that experts say is larger than any burned in centuries.
The Rim Fire has become the fourth-largest conflagration in modern California history, fire officials said Sunday as clouds and higher humidity helped crews further contain the biggest blaze in the United States this year.
San Francisco’s supply of water and electricity remained safe Sunday as a forest fire continued to burn out of control near Yosemite National Park and the Bay Area’s Hetch Hetchy water source, fire and utility officials said.
Overnight the Rim Fire on Yosemite’s northern border grew 7 square miles as firefighters gained little ground in slowing the now 207-square-mile blaze.
On Monday over 825,000 property owners, mostly in California’s rural areas near forests, started receiving a $150 annual fee by the state in order to help offset Cal Fire’s budget deficit.