More than 6.5 million people are under an excessive heat warning, including residents of Phoenix. Above normal temperatures in the Arizona capital could factor into heat indexes close to 120 degrees on Friday and Saturday.
On Wednesday the temperature alone was headed toward 110 degrees and Thursday will be hotter.
About 32.9 million people are under a heat advisory in states from Alabama to Texas and in an area where the borders of Kentucky and Ohio meet.Cities like Dallas, Oklahoma City, Little Rock, Memphis, St Louis and Birmingham could be see 110 to 115 heat indexes.
Medical experts say it is important during heat waves to stay hydrated by drinking plenty of fluids.
But don't load up on sugary or alcoholic drinks because that would make you lose more body fluid. Don't be tempted to gulp down cold water as that could cause stomach cramps, according to the CDC.
Make sure your beverage will also replace the salt and minerals you have lost due to sweating -- sports drinks can do the job.
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