Science / extreme heat Don't Like the Heat? We Have Bad News for You 90% of Americans will have to deal with temperatures 90 degrees or above this week By Evann Gastaldo, Newser Staff Posted Jul 17, 2019 3:05 PM CDT Copied A hiker finishes his morning walk at the South Mountain Preserve to beat the high temperatures, Thursday, July 11, 2019, in Phoenix. (AP Photo/Matt York) A record-breaking heat wave is expected across much of the central and eastern US through this weekend, and as USA Today reports, all in all more than 115 million Americans live where some level of heat alert is in effect. (That's more than a third of the current US population.) More numbers from the National Weather Service that may alarm those of us who aren't heat lovers: The heat wave is expected to affect two-thirds of the nation, per NBC News. Temperatures will hit 90 degrees and above for 290 million people, or 90% of Americans, at some point this week. "A large dome of high pressure will allow high temperatures to surge into the 90s and 100s in many locations, while heat indices will top 100 and approach 110 degrees or higher," says the NWS. Record high temperatures could be set this week in cities including Philadelphia; Newark, New Jersey; Manchester, New Hampshire; and Atlantic City, New Jersey. Other cities are expected to see their highest temperatures of the summer so far, per Accuweather. And nighttime won't be much better, with temperatures only dipping to the mid- to upper-70s in many places; records for warm nights are expected to be set in dozens of locations across the country. (Even Anchorage has been dealing with record-breaking heat.) Report an error