Millions of Americans are in store for a major heat wave this week as temperatures climb in the Northeast and other regions of the country, marking the kickoff to a summer that will be hotter than usual. In New York City, temperatures will be in the high 90s.

Climate change means temperatures are climbing earlier in the year, and dangerous heat is occurring more frequently. Prolonged exposure to hot temperatures can cause severe health consequences and even death.

Here’s what to know in order to stay safe and cool.

How hot will it get in New York City?

Forecasts show that temperatures will start to climb in New York City on Tuesday and remain elevated throughout the week, with a potential peak of 96 degrees on Friday.

The heat index is a measure of how hot it really feels outside, taking into account humidity and temperature. The heat index forecast for Friday is 98 degrees Fahrenheit.

Mayor Eric Adams said in a statement that he would activate the city’s heat emergency plan starting on Tuesday.