Heat wave forecast across much of U.S.

NOTE: this article was originally published by CBS News on June 22, 2025.

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We’re Havin A Heat Wave
A brutal heat wave is in the forecast across the eastern United States, and it’s expected to bring several days of record-high temperatures into this week. The National Weather Service has called it “the first significant heat wave this season.”

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The NWS said on Sunday that people from the Midwest to the East Coast should expect “numerous daily record maximum and minimum temperatures” through at least Wednesday from the heat wave forcast across much of the U.S.

“Light winds, sunny skies, and a lack of overnight cooling will pose a significant risk to those without adequate cooling and/or hydration,” the NWS said.

More than 150 million Americans are under the highest-level extreme heat alerts. Including heat advisories, the total number affected rises to 200 million. This marks one of the most expansive heat alert events ever, with major population centers from the Midwest to the Northeast under serious heat strain during the heat wave forecast across much of U.S. .

The temperature had already reached 80 degrees Fahrenheit in the Chicago area by 7:30 a.m. Sunday, according to the NWS. Forecasts called for heat indices of between 100 and 105 degrees F. Here’s what to know about the heat wave and how to stay safe during .

Heat wave forecast
“Summer has taken its time arriving in the Northeast, but it’s coming in HOT,” the National Weather Service wrote Wednesday in a social media post. “Triple-digit heat indices will be common through next week, with oppressive humidity.”

The heat index is what the actual temperature feels like when it’s combined with relative humidity.

How long will the heat wave last?
The heat is expected to shift into the Midwest and Ohio Valley by the end of the weekend and arrive in the Northeast and mid-Atlantic on Sunday through the first half of next week. Parts of the Northeast face a “High Risk” — a greater than 60% chance — of extreme heat through the middle of next week, according to the National Weather Service. Temperatures are forecast to be well into the 90s or even triple digits.

“I cannot emphasize this enough: extreme heat can be deadly,” New York Gov. Kathy Hochul warned. “The best way to stay safe is stay indoors, with air conditioning. This is not the time to start training for the marathon.”

What constitutes a heat wave?
A heat wave is a period of unusually hot weather that lasts more than two days, according to the National Weather Service about the heat wave forecast across much of U.S.

It often, but not always, covers a wide area and can expose a large number of people to hazardous heat, which can be extremely dangerous for vulnerable people, including children and the elderly.

How to stay safe during a heat wave
The simplest way to way to avoid heat-related illnesses is to stay out of the sun and avoid extended time outdoors in extreme temperatures, experts say.

If strenuous outdoor activities are unavoidable, you should dress for the heat and wear lightweight, loose-fitting and light-colored clothing, the National Weather Service recommended. You should also stay hydrated by drinking plenty of water, even if you’re not thirsty.

It’s also important to be aware of any symptoms of overheating, which include muscle cramps, unusually heavy sweating, shortness of breath, dizziness, headaches, weakness or nausea, according to the Centers for Disease Control and Prevention during the heat wave forecast across much of U.S. . If you experience these symptoms, one major sign to seek care is if the symptoms don’t improve after getting into a cooler environment or hydrating, experts say.