The massive wildfire has scorched about 10,500 acres (4,249 hectares) since it first began. Despite light rains in the morning, the fires remained zero per cent contained, according to US Forest Service spokesman Andrew Mitchell, reported news agency Reuters.
The fires caused mandatory evacuation of nearly 500 homes in areas about 40 miles (65 km) north of downtown Los Angeles, according to Mitchell.
However, no casualty has been reported.
The forest service spokesperson said investigation is being carried out to know the cause of the fire, though human activity was likely to be responsible.
Last burnt 50-100 years ago
The blazes burnt densely forested mountains north of Los Angeles that last burned some 50 to 100 years ago, according to the fire officials.
Thick, extremely dry vegetation, some of which has not burned in nearly 100 years, was triggering the blazes that roared swiftly up steep canyons and hillsides, Mitchell said.
The Angeles National Forest, which covers nearly 70,000 acres, is a popular destination for millions of residents living in Los Angeles metropolitan area.