The two fires have already spread over more than 5,900 hectares and two firefighters have suffered severe burns in the fight against them.
The largest of the fires started Monday morning on the outskirts of Irvine, about 60 kilometers southeast of Los Angeles, and spread rapidly due to drought and strong winds.
More than 3237 hectares have already been burned in this fire, but there are no reports of burned buildings yet, the local fire department informed.
The second fire broke out on Monday afternoon about 27 kilometers from Irvine and spread over more than 2,670 hectares.
Authorities have ordered the evacuation of more than 90,000 people.
Meteorologists have warned that low humidity, dried-up soil and strong winds have created the most dangerous conditions for potential fires this year.
A red fire risk warning has been issued in the region until Tuesday evening.
In California, more than 1.6 million acres have been burned by fires this year and flames have claimed the lives of 31 people.
The evacuation of people has been hampered by a new coronavirus pandemic that has hit California hard.
In California, more than 4,000 firefighters are currently involved in the fight against 22 fires, and 34 million people live in areas where a red fire risk warning has been issued, according to the state fire service.