1:38
On Friday, the heat index is forecast to hit 108 degrees in New York, 105 in Boston, 112 in Washington, D.C., and 111 in Memphis, Tennessee.
There will be minimal relief overnight, which makes the heat even more dangerous.
![\"PHOTO:](\"http://a.abcnews.com/images/US/holiday-heat-abc-gmh-260702_1782995821484_hpEmbed_16x9_384.jpg\")
On the Fourth of July on Saturday, the heat will improve slightly for the Northeast, but will still feel like the triple digits, with the heat index expected to reach 103 degrees in New York and 107 in D.C.
![\"PHOTO:](\"http://a.abcnews.com/images/US/heat-3-ap-gmh-260702_1782996805421_hpMain_4x3t_384.jpg\")
By Sunday and Monday, the strongest heat and humidity will settle over the Southeast. Raleigh, North Carolina, is expected to feel like 107 degrees and Savannah, Georgia, will feel like 105 degrees.
Extreme heat is the deadliest weather-related hazard in the U.S. At least 13,000 Americans have died from the heat since 2018, according to data from the Centers for Disease Control and Prevention.
Click here for tips on how to stay safe.
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