Millions and millions of Americans are being warned of "dangerous" heat in more than a dozen states as the summer 2025 season officially kicks off. In parts of the Midwest and Mid-Atlantic regions more than 42 million were under extreme heat watches the morning of June 20,

An "extremely dangerous heat wave" is continuing to scorch a huge area of the eastern United States June 23, affecting tens of millions of people.

Tens of millions of people across the Midwest and East are enduring another sweltering day of dangerously hot temperatures as a sprawling June heat wave grips much of the U.S.