Labor Day may mark the unofficial end of summer, but high heat and humidity will be sticking around for several more days in Massachusetts, according to the National Weather Service.

“Here we are in September and it’s going to feel more like July,’’ said Kim Buttrick, a weather service meteorologist.

Highs will be in the low 90s region wide on Monday, Buttrick said. Boston is expected to hit 91 degrees, which could be the beginning of a short heat wave if temperatures reach at least 90 three days in a row.

A southwest wind blowing at 10 to 20 miles per hour will keep South Coast highs in the mid- 80s.

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Record-breaking heat is possible on Tuesday and Wednesday, with temperatures climbing as high as 95 degrees. Dew points will be between 65 and 70, making the air feel muggy and uncomfortable.

Thursday will be partly cloudy with highs in the low to mid- 80s. Showers and thunderstorms will develop in the afternoon and could stall over the region through Friday morning, Buttrick said.

“We’re still in this dry spell,’’ Buttrick said, “out next chance for measurable rain comes on Thursday.’’

Highs will be more seasonable on Friday. Temperatures will average in the upper 70s state-wide, Buttrick said.

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