California doesn’t depend on the Gulf Coast to supply our gasoline, but drivers in the Golden State are paying the highest gas prices in the U.S. this month in the aftermath of Hurricane Harvey.

The storm, which temporarily shut down 25 percent of U.S. refining capacity as it flooded Houston, drove the national average price of gasoline up nearly 35 cents. In California, prices jumped by double-digits across the state, with Northern Californians paying about 18 cents more at the pump since AAA’s last survey on Aug. 9.

California’s average price for a gallon of regular unleaded was $3.16 on Tuesday, the highest in the state since 2015.

“An incident as severe as Harvey will have a big impact on the global supply chain, even if that region doesn’t supply California’s gas,” AAA Northern California spokesman Michael Blasky said. “Combined with strong summer travel demand, motorists in California are seeing the highest gas prices in two years.”

San Francisco drivers are paying the highest prices in the nation at $3.30 per gallon, up 18 cents since August.

Yreka drivers saw a 27-cent increase from $2.98 to $3.25, the largest spike in the region.

South Lake Tahoe normally has the highest prices in Northern California, but drivers there saw a comparably small 8-cent price increase to $3.26.

But there’s good news on the horizon: Prices held steady over the last five days, stabilizing as Houston refineries returned to production.

“Gas prices historically fall after Labor Day, so drivers should expect to pay lower prices unless there’s another disruption in the oil market,” Blasky said.