Think cool thoughts — a heat wave is expected to descend on Boston Tuesday, June 18, and last through Friday, June 21, bringing excessive, potentially record-breaking temperatures and humidity.

The National Weather Service issued a Heat Advisory in Suffolk County that begins at 12 p.m. Tuesday, June 18 and lasts through 7 p.m. Friday, June 21. During the advisory, the heat index value — the way humidity + temperatures feel on the body — could exceed 100°.

In response to the anticipated heat, Mayor Michelle Wu declared a "heat emergency" through Thursday, encouraging locals to take precautions to stay safe.

The Boston Center for Youth and Families will operate 14 Cooling Centers throughout the city.
Boston Public Libraries will be open for locals trying to escape the heat — though they will close on Wednesday, June 19 to observe Juneteenth.
The city has provided information for residents to prepare for the weather and to address emergency situations.