Education Queensland (EQ) says teachers will focus on "hats and water bottles" as temperatures continue to rise.
Cairns in the far north is expected to reach 33 degrees Celsius today, with areas like Normanton in the state's north-west expected to hit 43.
EQ spokesman Richard Huelin says teachers will ensure children are hydrated and protected from the sun.
"With the cooler schools program that rolled out many years ago now, our schools are all airconditioned, so it's not like the old days when it got to 40 degrees and someone thought we better send the kids home," he said.
"That's not the case any more - it really comes back to making sure that the kids are sun safe when the kids are outside.
"Most of our schools are really insistent around that.
He says students have water in the classrooms.
"Lots of classrooms you would go into you would see the kids have their drink in water bottles sitting on the desk in front of them," he said.
"Out in the playground, of course, the advice from teachers is make sure you are hydrated, particularly before you go charging out and running around the paddock and having a game of footy."
© ABC 2012
09:23 EST Winds described as "tornado-like" by emergency workers have left a trail of damage in Tasmania's north-west overnight, injuring one man and causing widespread power cuts.