The Thomas Fire scorched 96,000 acres by Thursday morning, according to the Ventura County Fire Department.
As of Tuesday, power was restored to only a quarter of the island since Maria hit with its heavy rains and 155 mph winds.
The California Department of Insurance said Thursday the flames caused more than $1 billion in losses across the region.
Ophelia's strong winds and heavy rain damaged buildings, uprooted trees and knocked out power for more than 350,000 residents.
As of Wednesday the fires had burned nearly 170,000 acres and destroyed about 3,500 homes and business. At least 21 people have died.
After arriving in Puerto Rico on Tuesday, President Donald Trump appeared to joke about the cost of Hurricane Maria's devastation to the territory.
San Juan Mayor Carmen Yulín Cruz had some sharp words about the "inefficiency" of federal response to Hurricane Maria.
Thousands of cargo containers filled with much-needed supplies are sitting at the island's ports, but distributing those items has been difficult.
Irma spent more than 10 days as a hurricane. And the powerful storm wreaked havoc on the Caribbean and Florida during that time.
The once-powerful Category 5 hurricane dropped to tropical storm strength early Monday after pummeling the state with wind, rain and storm surges.
Hurricane Irma is one of the most powerful in history, but it's not the first time Florida has gotten slammed.
Authorities say at least 10 people are dead after the storm hammered multiple islands, including Barbuda, St. Martin and the British Virgin Islands.