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Jun 29, 2026

Dangerous heat wave to scorch much of U.S. ahead of July Fourth, with historic highs possible

Extreme heat warning in New York
People walk along the Brooklyn Bridge during an extreme heat warning in New York last year.Eduardo Munoz / Reuters file
June 28, 2026, 2:01 PM EDT / Updated June 28, 2026, 8:08 PM EDTBy Christine Rapp and Dennis Romero

An intense and prolonged heat wave could bring record temperatures to the central and eastern United States ahead of Independence Day celebrations.

Nearly 142 million people were under National Weather Service heat alerts, with that number likely to grow as heat moves toward the Southeast, Midwest and Northeast.

“The latest guidance continues to strongly agree on a potentially historic heatwave across the eastern third of the country for the end of the week,” the weather service said in a forecast discussion Sunday.

The weather service added that Thursday and Friday could face “the possibility of all-time record highs” in places.

Cities including Chicago; Kansas City and St. Louis, Missouri; Nashville, Tennessee; Savannah, Georgia; Philadelphia; and Boston are under alerts, with daytime highs expected to climb into the 90s and the 100s.

The weather service’s forecast discussion for Kansas City said the stubborn heat could last through the Fourth of July. “We expect to be locked into a hot and dry pattern through at least Thursday, but probably through Saturday,” it said.

As the wave reaches the East midweek, the heat index value could surge past 100 degrees Fahrenheit in Philadelphia and Washington, with Philadelphia feeling as hot as 112 by Thursday.

The weather service office for New York City issued an extreme heat watch for the region that covers Monday through Wednesday. It notes the “feels like” temperature, known as the heat index, is forecast to reach 108.

Factoring in the humidity, heat index values could reach 105 to 114 in other places under the dome through the week.

Highs across the East and Southeast will generally be 5 to 10 degrees above normal as the wave spreads eastward, with a few records possible in Florida’s Key West, Miami, Orlando and Tampa.

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