The first major heat wave of the summer will bring another day of dangerously high temperatures to the East Coast on Wednesday before relief moves in. The oppressive heat shattered records across the Northeast on Tuesday.

Temps are soaring in cities across the Atlantic coast, where some cities are reaching 100 degrees with heat indexes approaching 110 degrees.

Tens of millions of people in major cities across the U.S. Northeast are facing record high temperatures on Tuesday on what was expected to be the worst day of an oppressive heat wave that has spread over much of the country since late last week.

By Tuesday night — following the fourth hottest day on record in Boston — Mass General’s emergency department was slammed.

The first heat wave of the summer has hit Boston, and people are braced for it. Temperatures could reach 100 degrees over the next few days, although a sea breeze on Monday kept Boston slightly cooler than inland parts of the state.

With temperatures set to skyrocket into triple digits Tuesday as the heat wave continues, here are some ways to cool down in the Boston area.