The city's Elderly Commission made robocalls to 30,000 Boston seniors, advising them of precautions to take to deal with the heat. The calls provided the number to Mayor Thomas Menino's 24-hour hotline: 617-635-4500.
On Thursday, the heat caused 120 people to receive medical evaluations at Independence Day celebrations on the city's Esplanade, said Jim Hooley, chief of Boston Emergency Medical Services. Four people were taken to a local hospital as a precaution, he said. Temperatures along the Charles River reached into the 90s on the holiday.
In light of the terror bombings at the Boston Marathon in April, security was very tight for the July Fourth events.
"I think it's going very well, for the most part," State Police Col. Timothy Alben told the The Boston Globe. "The public has cooperated tremendously. There are always going to be some people who don't like [tight security]. We understand that. But I think it's the world we live in."
Feeling hot in Philadelphia and New York City
Meanwhile on Friday, the heat continued to oppress Philadelphia. The city was under an excessive heat watch, with temperatures expected in the lower to middle 90s, Lefevre said.
And New York City will be a steamer. A heat advisory remains in effect until 8 p.m. Sunday for all five boroughs. Temperatures are expected in the lower to middle 90s, the National Weather Service shows.
Cooling centers will be open Friday through Sunday throughout the city, New York City Office of Management spokesman Nancy Greco said. Public areas with air conditioning, such as senior centers and libraries, will house cooling centers for those who don't have air-conditioned homes, she said.
New Yorkers can call 311 or go online to find a center near them.