For some schools, this kind of weather poses potential health problems.
With no A.C. inside the classroom, some districts let kids out early Monday.
KSFY News visited one school which dismissed classes on account of the heat.
Kids here at Hawthorne Elementary have A.C. to beat the heat. But we went to the West Lyon Community School in Iowa and the classrooms and hallways felt like a steam room.
We could only take being in there for a few minutes so you can imagine how those kids felt.
It was anything but too cool for school for some districts today. The extreme heat forced some districts to ring school bells early for dismissal.
And school subjects like math and science may not come easy for some students. But try paying attention in geometry class when the room feels like a sauna.
West Lyon Community School District administrators told us they decided to close early for the safety of the kids. But they also say the heat is not idealistic for learning.
Principal Doug Jiskoot said "it is a bit of a struggle, certainly when we get later in the afternoon, the mornings aren't quite so bad. As the day progresses it does get uncomfortable in the rooms, and it can be hard to focus, but our teachers do a good job of re-focusing. We give lots of water breaks and do what we can to try and make it, and help the students get through the period."
West Lyon administrators take several factors into consideration, such as the temperature outside and asking teachers about classroom conditions.
So they'll also close early Tuesday.
And if this heat continues, kids will get out early all week long.
Some might wonder, in this day and age, why doesn't the district add A.C.?
Principal Jiskoot tells us the district considered it several years ago, but it was cost prohibitive. And when schools already have limited resources, they have to think about the best place to invest those dollars.