You'll need a couple dollars extra to fill up your tank if you're driving out of town this Labor Day weekend.
In the East Bay, the average price for a gallon of unleaded regular has risen to $4.18 from $4.14 last week and $3.79 last month.
In Concord, the cheapest prices listed on the website gasbuddy.com are $3.99 per gallon at Costco on Detroit Avenue and the nearby Arco station.
This is the highest Labor Day weekend gas prices on record. Analysts say the prices may edge upward during the weekend due to Hurricane Isaac's effect on Gulf Coast refineries.
The hurricane comes on top of refinery fires in Richmond and Venezuela this summer.