The first day comes amid a heat wave, with temperatures once again set to stretch into the 90s, bringing early dismissals on Tuesday and Wednesday for 74 schools in the Philadelphia School District that lack air conditioning.

The district has been working to improve cooling systems in schools with the goal of providing every school with the system it needs in order to keep students in school. 

The School District of Philadelphia said they’ll monitor the weather to determine whether classes will be dismissed early on Thursday and Friday.

Officials say they will know by noon the day before.

Some parents said it’s the best solution to keep students safe, but the late notice impacts their schedule.

“It’s a lot of running around to me,” said Aiyana Payton, who has a son in the school district.

“I might have to take off of work,” said Leavy. “I feel like we’re just starting to get back to the norm, so now the kids have to come home early because of the heat. It’s kind of frustrating.”

The district said they’ve been working with urgency to install updated air conditioning systems and electrical systems in the schools over the past five years.