PHILADELPHIA (CBS) — The blistering heat and humidity can make it pretty tough to stay outside for any extended period of time.

So when you’re inside of a school that has limited air conditioning and fans, that heat could become unbearable.

READ MORE: Family Holds Balloon Release For 'Gentle Soul' 17-Year-Old Nasir Muhammad, Gunned Down In Front Of Mom's Home

For that reason all Philadelphia schools will dismiss at noon tomorrow, Wednesday, September 5th.

MORE NEWS: 'Mom-And-Pop Bakeries Are Dying': Homemade Goodies By Roz May Have To Close Due To Worker Shortage

All after-school activities, including all athletic programs are canceled.

A full list of school closings and early dismissals can be found here.