1:29
On Wednesday, the heat will continue in the Midwest and the South and also spread into the Northeast.
The heat index is forecast to reach a scorching 108 degrees in Detroit, 105 degrees in Houston, 102 in New York City, and 104 in Philadelphia and Washington, D.C.
![\"PHOTO:](\"http://a.abcnews.com/images/US/weather-map-1-abc-jef-260630_1782822050535_hpEmbed_16x9_384.jpg\")
The heat will stay in place in the Great Lakes and the South Thursday, with temperatures climbing even higher in the Northeast. The heat index could hit 107 degrees in New York City, 111 in Philadelphia and 110 in Washington, D.C.
There will be minimal relief overnight, which makes the heat even more dangerous.
We’re bracing for a historic heat wave. The best way to stay safe is to stay in air conditioning.
— Mayor Zohran Kwame Mamdani (@NYCMayor) June 30, 2026
Cooling centers are already available now with hundreds more being activated WEDNESDAY.
Visit https://t.co/sS0oTHOrz3 to find the closest one to you. pic.twitter.com/JsDtl2Xa1B
The unrelenting heat continues Friday with the heat index forecast to reach 102 in Detroit, 106 in Memphis, Tennessee, 102 in Tampa, Florida, and 109 in New York, Philadelphia and Washington, D.C.
Extreme heat is considered the deadliest weather-related hazard in the U.S.
At least 13,000 Americans have died from heat since 2018, according to the Centers for Disease Control and Prevention.
On the Fourth of July on Saturday, the heat index will remain dangerously high, forecast to hit 104 in New York, 109 in Washington, D.C., and 108 in Philadelphia.
Click here for tips on how to stay safe.
ABC News' Dan Peck and Michelle Simmons contributed to this report.
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