The second round of the knockout stage commences Saturday with Canada facing Morocco in the opener in Houston, while powerhouse France and Kylian Mbappé will meet Paraguay in the nightcap in Philadelphia.
During extreme heat waves, power grids are more vulnerable to outages. Experts and utilities said there are many ways people can reduce the energy strain.
Amtrak has canceled more than two dozen trains in the Northeast due to the heat as holiday travel is in full effect.
Forecasters say the hottest World Cup tournament match so far this year could hit Saturday afternoon, during the knockout round game between France and Paraguay in Philadelphia
Officials are urging attendees to take precautions and protect themselves from the heat.