Just as the summer travel season heats up, gas prices are finally dropping, with the national average falling below $4 a gallon.

It marks the first time since March 30 prices are that low, and follows nearly four straight weeks of declines, according to data from AAA.

Massachusetts and the northeast as a whole are still above that average, at $4.09 a gallon, but it’s down sharply just in the past week.

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Prices are lower south of Boston, such as in Bristol and Plymouth counties, and some wholesale clubs are selling at $3.60 a gallon.

Mark Schieldrop, spokesperson for AAA Northeast, says the highest price paid at the pump in Massachusetts during the war was $4.50 a gallon.

Schieldrop said the decrease comes on the heels of the U.S. agreement with Iran to end the war and open the Strait of Hormuz, causing crude oil prices to fall.

“We’ve seen a nice steady decline in prices that really started more than three weeks ago,” he said, “Markets anticipated this happening, and that really led to prices beginning to fall.”

Since prices can vary, he recommends drivers shop around and avoid convenient locations.

“You are going to see those higher gas prices right off that highway exit at that first gas station that you see, because they know that they’re going to catch a lot of stray travelers,” he said.

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Decreasing gas prices comes as millions of Americans prepare to travel for July 4 in record numbers starting next weekend.

“When prices are on a downward trajectory, that certainly is conducive to encouraging folks to travel,” Schieldrop said. “We do expect strong travel over the July Fourth holiday. And people are still very interested in travel.”

While gas station owners are sometimes accused of price gouging, Schieldrop said most are trying to navigate a volatile market themselves, and are looking to stay competitive when prices drop and they have a surplus.

“They have to be very careful about sort of using a price buffer to ride that volatility so that way you’re able to make money, but you’re not gouging customers, and you’re being competitive in a market because the retail gasoline market is very competitive, ”he said.

Prices a year ago were $3.05 a gallon, but he said we won’t be getting anywhere near those prices this summer.