How to stay safe during heat waves – and heat stroke warning signs to watch for

Summer is just getting started, and millions of people are under heat advisories as a major heat wave spreads across large parts of the central and eastern U.S. in June 2025.

For many people, summer is their favorite season, a time for cookouts, beach trips and other outdoor activities. However, summer also brings the risk of dangerously high temperatures and humidity.

In the U.S., hundreds of people working or playing outside – even those who seem healthy – succumb to…