BOSTON (WHDH) - A heat advisory has been issued for most of Massachusetts through Thursday night due to feel-like temperatures that could climb into the 100s.

The advisory is in effect for parts of Middlesex, Essex, Franklin, Hamden, Hampshire, Norfolk, Bristol, Worcester, Plymouth, Suffolk, and Berkshire counties from 10 a.m. to 8 p.m.

Cape Cod and the Islands are excluded from the heat advisory.

Heat index values as high as 98 to 102 are expected as hazy, humid conditions accompany 90-degree in most parts of the state.

Boston clinched its fourth heat wave of the summer around 11 a.m. when temperatures in the city eclipsed 90 degrees for the third straight day.

The oppressive conditions may cause heat illnesses to occur, the National Weather Service warned.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the NWS said in an advisory. “Young children and pets should never be left unattended in vehicles under any circumstances.”

7Weather Meteorologist Chris Lambert noted that there will be no threat for thunderstorms for people who head to the beach to cool off.

While temperatures will near 90 degrees on Friday, the weekend will bring drastically cooler conditions with highs in the low 70s.

For more, click here to to visit the 7Weather page.

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