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.