AUGUSTA — The expected fall of gasoline prices with the end of the summer driving season still isn’t here, as the average retail cost of a gallon of gas in Maine jumped nearly a nickel in the past week.

Price-monitoring website MaineGasPrices.com reports Monday that gas is up to $3.94 a gallon in Maine, 13 cents higher than the national average.

Prices are now more than 20 cents per gallon higher than the same day a year ago and more than 16 cents per gallon higher than a month ago.

A company analyst says supply remains tight and the oil industry is still bringing capacity back after Hurricane Isaac hit the Gulf.