Latest official figures show 22 active fires across California which have so far killed at least 23 people.
More than 170,000 acres have been turned to ash since the fires started on Sunday, with areas in the north of the state worst affected.
Many of the blazes around Napa, Santa Rosa and Sonoma counties are burning almost completely unchecked, with small fires constantly starting as embers are carried by strong winds on to dry ground.
Officials have today ordered residents to evacuate previously unaffected neighbourhoods in Solano County, which borders Napa County.
A handful of fires are also burning in southern California, though they are smaller and crews are having more success in containing them.
Ken Pimlott, chief of California Department of Forestry and Fire Protection (Cal Fire) told The New York Times: “These fires are literally just burning faster than firefighters can run.
“We are attacking many, many new fires that we put out while they are still small.”
Meteorologists warned yesterday dry, windy conditions in the coming days are likely to fan the flames and spread even more small fires.
To make matters worse, no rain is forecast to fall over the north of the state until at least next week.
The bulk of the blazes are clustered in northern California, with the worst affected areas around Napa County and the city of Santa Rosa.
The Atlas Fire, which completely surrounds Napa City to the north and east, is raging over more than 43,000 acres.
Despite tireless efforts by emergency services, it is only three per cent contained.
The Tubbs Fire, which wiped out entire neighbourhoods in Santa Rosa earlier this week, is still burning over 27,000 acres. Crews have managed to contain 10 per cent of it so far.
And one fire is still burning over nearly 10,000 acres in the Anaheim Hills, east of Los Angeles.
Thick smoke from the blaze partially blocked out the sun over Disneyland casting an eerie orange glow over the popular theme park. Crews say they have this wildfire 60 per cent contained.
Most of the fires started on Sunday and quickly spread due to dry conditions and embers being carried by 50mph winds.
Cal Fire’s Mr Pimlott has previously said it was “unlikely” the fires were started by lightning, though he added it was impossible to be sure at this stage.