Baltimore City Public Schools headquarters on North Avenue. Photo by Eli Pousson/Baltimore Heritage, via Flickr.

For the third time in as many weeks, dozens of city schools without air conditioning are letting out early today due to the hot weather.

Baltimore City Public Schools announced a three-hour-early dismissal for some schools shortly after 10:30 a.m. A list on the school systemโ€™s website includes 49 elementary, middle and high schools. The Baltimore City Collegiate School for Boys is also dismissing three hours early, per a separate notice.

Temperatures are forecast to reach the low 90s today. Today is forecast to be the hottest day of the week, though Thursday could also reach the upper 80s, per the National Weather Service.

Dozens of city schools dismissed early on Sept. 4, the second day of the school year, and again on Sept. 12.

Baltimore schools have a maintenance backlog of nearly $3 billion, including needed installation or replacement of AC units, which the school system said is due to decades of under-funding.

The state has been chipping away at the problem little by little. Nearly two weeks ago, the Interagency Committee on School Construction approved a new disbursement for AC replacements in city and Baltimore County schools.

Five schools on that listโ€“Booker T. Washington Middle/High School, Dickey Hill Elementary/Middle, Edgecombe Circle Elementary, Edgewood Elementary School and Mount Royal Elementary/Middleโ€“are due for $9 million in combined funding for new air conditioning units in every classroom, CBS Baltimore reported.

Teachers campaigned last month to bring fans to classrooms as a stopgap, but the school district pushed back, saying buildingsโ€™ electrical infrastructure wouldnโ€™t be able to withstand all of the extra appliances.

Ethan McLeod is a freelance reporter in Baltimore. He previously worked as an editor for the Baltimore Business Journal and Baltimore Fishbowl. His work has appeared in Bloomberg CityLab, Next City and...