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A heat wave is expected through Tuesday as temperatures cracked 90 degrees in Boston Sunday, according to the National Weather Service.

Southwesterly winds were more persistent than expected, allowing the afternoon temperature in Boston to climb to 93 degrees, according to Lenore Correia, a weather service meteorologist.

Temperatures are expected to crest at 92 degrees Monday and Tuesday with a lower level of humidity compared to last weekend, forecasters said.

“It’s still going to be hot and humid, but last weekend we actually had the headline of an excessive heat warning,” said Kim Buttrick, a weather service meteorologist.

An official heat wave requires at least three days with temperatures of 90 degrees or above.

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“This is going to feel more what we think of as a hazy-hot-humid summer afternoon,” she said. Dewpoints, a marker of humidity, are expected in the mid- to upper 60s Monday and Tuesday, compared to the mid-70s during the July 19-21 heat wave, according to Buttrick.

A heat advisory was also issued for parts of eastern Massachusetts from 8 a.m. Monday to 8 p.m. Tuesday.

“The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible,” forecasters said. “Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors.”

Upper level atmospheric disturbances could bring scattered showers and thunderstorms, mainly in the interior of the state, in the afternoons through Wednesday, she said.

Temperatures are expected to return to more seasonable levels, with a likely high Wednesday about 86 degrees, according to the weather service.

Thursday, with a high near 82, could bring rain in the morning, but skies are expected to begin clearing at about 1 p.m., according to the weather service.

A dry, seasonable weekend is expected to follow, with sun and highs near 80 Friday and 82 Saturday, forecasters said. Lows are expected in the upper 60s.

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Lucas Phillips can be reached at lucas.phillips@globe.com.