Expect to see a lot of shorts t-shirts as kids line up for the first day of class.
All of Southern Ontario is under a Heat Warning issued by Environment Canada.
The weather agency expects temperatures to hit the low 30s for the first day back Tuesday and again on Wednesday. Humidex values will push into the high 30s and low 40s.
The average high for this time of year is 22 degrees.
Nancy, a fifth-grade teacher at Brampton's Russell D Barber Public School says in the temperature in her second-floor classroom can climb above 40 degrees.
"The administrative offices are air-conditioned and the library. Everything else is like a heat drum up there, nothing's moving," Nancy tells Moore in the Morning. The woman with close to five decades of teaching under her belt says her three classroom fans are no help. In fact Nancy confesses her clothes are sometimes so sweat-soaked that she goes home at lunch to change.
Students and staff at hundreds of GTA school will have to tough it out through a sweltering first day with limited or no access to air conditioning. In June the Toronto District School Board pointed to cost as the blockade to cooler schools.
But Nancy, who is employed by the Peel District School Board thinks A/C should be mandatory at school, saying it is hotter in 2016 than it used to be.