A wildfire consuming a vast stretch of hilly forest along the New York-New Jersey border continued to grow on Monday despite the first significant rainfall in nearly six weeks, fire officials said. Bone-dry weather and gusts of up to 40 miles per hour are expected to sweep through the region on Tuesday, raising the risk that the fire will continue to spread.

The fire covered about 5,000 acres in New York and New Jersey, Gov. Kathy Hochul of New York said on Monday afternoon, an increase from 3,000 acres on Sunday. The governor, however, cautioned that the estimate included some areas that had already stopped burning.

The fire had blazed across 3,500 acres in New Jersey alone as of Monday night, and only 20 percent of the state’s portion of the fire was contained, according to the New Jersey Forest Fire Service. It was not clear how much of the New York portion of the fire was contained.

The rain on Sunday night, measuring just a quarter of an inch across the region, only temporarily slowed the fire’s growth, said Christopher Franek, an assistant division fire warden for the Forest Fire Service.

“We’re throwing everything we’ve got at it,” he said. “A lot of manual labor is choking on smoke and dust.” Five thousand acres is nearly eight square miles — a little more than a third the size of Manhattan.

Hundreds of firefighters from dozens of fire departments in both states are battling the blaze in a rugged patch of Passaic County in New Jersey and Orange County in New York near the Appalachian Trail.