California authorities have ordered more than 180,000 people to evacuate and had declared a state of emergency in response to raging wildfires.
Around two million people have been left without electricity across the US state.
California was deploying every resource which is available to fight multiple wildfires, said on Sunday, as thousands of firefighters were striving to control the fire.
Newsom has now Announced a state of emergency due to the “unprecedented” high winds fueling the spread of the fires through dry vegetation.
Around 180,000 people have been ordered to evacuate from Sonoma County north of San Francisco.
He said in a statement that people in evacuation zones must heed the warnings from officials and first responders.
The Kincade fire had grown to 85 square miles (220 square kilometres) and had already destroyed 94 buildings in Sonoma County since it erupted. Only 10% of it had been contained by the following Sunday, according to officials.
In the south of the state, the other major blaze dubbed Tick Fire also prompted the evacuations around the Santa Clarita area near Los Angeles in recent days. Several smaller fires have now been reported.
The main cause of the fires was not known, but Pacific Gas & Electric power company said one of their high-voltage transmission lines malfunctioned minutes before the Kincade fire started in the same area.
They started cutting power on Thursday to reduce further risks. By Sunday, more than 2.3 million residents were left without electricity.
Two first responders have been hospitalized due to burns during the Kincade Fire. Cal Fire spokesman, Jonathan Cox said one person has even suffered a burn injury and was flown to UC Davis Medical Center. A 2nd person was treated at a local hospital.
Weather experts also guessed heavy gusts of winds on Sunday, reaching 80mph (129 kph) on hillsides.
The winds are expected to lose intensity by Monday but might pick up again as early as Tuesday night.