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Temperatures will feel like 100 degrees

Clemet Cannone carried water through security on the Esplanade Thursday morning.

Essdras M Suarez / Globe Staff

Clemet Cannone carried water through security on the Esplanade Thursday morning.

A heat advisory is in effect today for much of Eastern Massachusetts, including Boston, where thousands are gathering on the Esplanade for Fourth of July festivities. Temperatures in the mid-90s will combine with high humidity to make it feel like it’s more than 100 degrees, the National Weather Service said.

The forecasters recommended minimizing outside activity during the hottest part of the day, staying out of the sun, staying in an air-conditioned place, and drinking plenty of water.

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Shortly before 10 a.m., the temperature at Logan International Airport was already 86 degrees.

Western Massachusetts might get a smidgen of relief from a slight chance of scattered showers, forecasters said. A weak southwest breeze could also help.

As the Boston Pops reaches its crescendo and the fireworks display lights up the Boston skyline around 9:30 p.m. tonight, temperatures should be slightly milder, around 83, although dewpoints will still be high, said meteorologist Bill Simpson.

Friday won’t see much change, with a heat advisory likely again in effect and temperatures again feeling like 100 degrees.

The weekend will see some relative cooling, as temperatures dip into the lower 90s. The chance of precipitation will rise slightly over the weekend, but no intense, damaging storms are expected.

“It might be only 90 by Sunday, so still warm, but not quite as hot,” Simpson said.

With temperatures reaching 91 degrees at Logan Wednesday, the state appears to be embarked on a prolonged heat wave. Temperatures over 90 are expected into early next week. The official definition of a heat wave is three days of 90 degrees or more.

Jasper can be reached at jasper.craven@globe.com or on Twitter @Jasper_Craven
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