High temperatures are causing the Rapid City School District to let classes out at 1 p.m. on Tuesday and Wednesday.
With temperatures outside already approaching 90-degrees, it's even hotter inside some schools.
In a classroom on the third floor at Wilson Elementary, the building was hotter than it was outside.
Teachers are using fans to try and keep their classrooms cool and students are being encouraged to drink lots of water, but it's still very uncomfortable.
Many aging schools in the district like Wilson Elementary don't have air conditioning, so they're really at the mercy of the weather.
Coming up later on KELOLAND News, Derek Olson talks with the Rapid City Superintendent about how he decides when the heat is too high for students' safety.