1:28
There will be minimal relief overnight, which makes the heat even more dangerous.
The unrelenting heat will continue on Friday. The heat index is forecast to hit 107 degrees in New York, 110 in D.C., 105 in Raleigh, North Carolina, and 109 in Memphis, Tennessee.
It'll stay hot and humid on the 4th of July on Saturday, with triple digit heat indices across the Midwest, South and Northeast.
![\"PHOTO:](\"http://a.abcnews.com/images/US/map-2-abc-jef-260701_1782908784630_hpEmbed_16x9_384.jpg\")
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.
Click here for tips on how to stay safe.
ABC News' Dan Peck and Michelle Simmons contributed to this report.
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