By Natalie Wu

Copyright cnbc

Nationally, gas prices have risen slightly since late August, mainly due to significant price increases on the West Coast and in the Northeast.

States like Arizona, Washington, Oregon, California and Nevada have experienced supply issues stemming from unplanned maintenance, permanent refinery shutdowns and a significant pipeline outage in the Pacific Northwest, De Haan says. The Northeast has seen some price increases due to its reliance on imported gasoline.

Prices on the West Coast and in the Northeast are expected to drop “quite substantially” and should return to a more normal balance with the national average over the next six to eight weeks as supply issues are resolved, De Haan says.

“There will be probably more relief in the West Coast and the Northeastern U.S. over the next eight weeks than other regions,” De Haan says.

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