PHILADELPHIA (AP) — The eastern U.S. sweated through a second day of early-season heat Wednesday, with some schoolchildren being sent home while others stayed in sweltering classrooms.

Philadelphia shifted to remote learning for students at 57 schools, saying that while the district has made progress, a number of them continue to have inadequate air conditioning.

The heat sneaked up on some Philadelphia residents and had them concerned about electricity bills before summer has even set in, said Lauren Authur, who lives in the city.

“Today has been like a heatwave,” Authur said, “and when you have little children, you use more of your air conditioning than anything to try to prevent them from being sick.”

“It honestly got hot sooner than we expected it to be,” she said.

The National Weather Service said another day of record heat was expected from the mid-Atlantic to New England before a cold front brings rain later in the week. Daily high temperature records were broken Tuesday in Portland, Maine, at 92 degrees Fahrenheit (33 degrees Celsius), and in Boston at 96 (35.5 Celsius).

Temperatures were expected to plunge as low as 45 Fahrenheit (7 Celsius) in Portland and 50 (10 Celsius) in Boston as soon as Thursday.

In Boston’s Dorchester neighborhood, officials at one high school set up fans, passed around bottled water and allowed students to wear shorts and T-shirts instead of their usual uniforms.

“The heat outside feels like it’s manageable because of the wind but inside it feels just tight and burdening because we also have to go through quizzes, exams, there is no excuse,” student Ariolainy Baez told CBS News.

A heat advisory was in effect for portions of New York, New Jersey, Pennsylvania, Connecticut, Massachusetts and Rhode Island through Wednesday evening.

In Maine, temperatures soared again Wednesday for Portland, and the small town of Fryeburg also sizzled a day after setting its own local heat record. Authorities advised people to use caution when outside.

“Our bodies are not adapted to the heat yet. On the first hot days of the year, it’s especially important to take breaks in the shade or A/C and drink plenty of water,” the Maine Center for Disease Control and Prevention said in a statement.

Some people coped by flocking to beaches that were not yet besieged by summer tourists. Others turned front lawn sprinklers into makeshift water parks for their children and neighbors.

In New York City, officials opened cooling centers.

“Just as New Yorkers look out for one another through the coldest days of winter, we must do the same through the hottest days of the year,” Mayor Zohran Mamdani said.

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Whittle reported from Scarborough, Maine. Associated Press writer Holly Ramer contributed from Concord, New Hampshire.

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