ABC NewsVideoLiveShowsShopLog InStream onRecord-shattering heat wave hitting wide swath of US: Latest forecastDenver to Chicago to New York will be feeling the heat.ByEmily Shapiro and Kyle DavidJune 20, 2025, 9:40 AM1:10People pass walk as the sun rises over the New York skyline as is seen from Weehawken New Jersey on June 20, 2025.Kena Betancur/AFP via Getty ImagesA dangerous heat wave is moving in, with more than 100 million people from the Midwest to the Northeast on alert for life-threatening temperatures.The widespread heat alerts are first impacting Midwest states including Minnesota, Wisconsin, Nebraska and South Dakota. The heat index -- what the temperature feels like with humidity -- could reach 110 degrees on Friday and Saturday.Excessive Heat through Saturday MapABC NewsMORE: Heat stroke vs. heat exhaustion: Safety tips in a heat waveCentral U.S. cities like Denver and Minneapolis could shatter heat records this weekend. In the Chicago area, the heat index could hit 105 degrees from Saturday to Monday.Heat Shifting East - Next Three Days MapABC NewsMORE: Expert hydration tips to keep cool this summer amid dangerous heat wavesThe South will also be feeling the heat. The heat index is forecast to hit 104 degrees in Nashville, Tennessee, and Louisville, Kentucky, on Sunday and Tuesday.The dangerous and record-shattering heat will shift east by the end of the weekend and the start of next week. Daily record highs are possible from Detroit to Raleigh, North Carolina, to Boston on Monday and Tuesday.In New York City, the heat index is expected to skyrocket to 103 degrees, 107 degrees and 105 degrees from Sunday to Tuesday. In Washington, D.C, the heat index is forecast to jump to 103 degrees, 107 degrees and 108 degrees.A woman runs as the sun rises over the New York skyline as is seen from Weehawken New Jersey on June 20, 2025.Kena Betancur/AFP via Getty ImagesMORE: Summer travel forecast: Busiest days to fly and how to save on airfareBoston could feel like 102 degrees on Tuesday.Heat indices up to 107 are also possible in cities including Detroit, Cleveland, Ohio, Pittsburgh and Philadelphia from Sunday to Wednesday.People pass walk as the sun rises over the New York skyline as is seen from Weehawken New Jersey on June 20, 2025.Kena Betancur/AFP via Getty ImagesDoctors recommend taking excessive heat warnings seriously. Over 700 people die from heat-related illnesses every year, according to the Centers for Disease Control and Prevention, and extreme heat is considered the deadliest weather-related hazard in the U.S., according to the Fifth National Climate Assessment.Click here for tips to stay safe in the heat.Related TopicsWeatherSponsored Content by TaboolaPopular ReadsSherri Papini claims ex-boyfriend abducted her in hoax kidnapping caseJun 20, 7:42 AMTrump says US strikes hit Iran 'far below ground level'Jun 23, 2:06 AMMAGA star Steve Bannon plays outsized role in Trump's Iran decision: SourcesJun 21, 10:02 AMNewlywed couple's honeymoon in US Virgin Islands ends with her ICE detentionJun 21, 5:35 PMABC News Live24/7 coverage of breaking news and live eventsABC News NetworkPrivacy PolicyYour US State Privacy RightsChildren's Online Privacy PolicyInterest-Based AdsAbout Nielsen MeasurementTerms of UseDo Not Sell or Share My Personal InformationContact Us © 2025 ABC News, A multiday heat wave is bringing high temperatures and health risks from the Midwest to the Northeast, prompting warnings and emergency measures. See detailed maps about the latest heat index , Record-smashing daytime temperatures near 100 degrees are expected for millions from the Plains to the East Coast this week, while nighttime temperatures may stay above 80 in some metropolitan areas..