Ossining School Superintendent Mary Fox-Alter says some activities, like gym classes, were moved to different locations and times due to the heat on Tuesday.
She added that temperatures outdoors and playground blacktop are monitored during times of extreme heat.
The administration spent the day putting its fairly new extreme heat conditions policy to the test.
"When the interior spaces turn 82 [degrees], we have a plan to mitigate that, which includes things like turning down the shades and turning off lights, and making sure everyone is well hydrated," said Fox-Alter.
If a classroom reaches 88 degrees, students and faculty will either be moved to a cooler location or the school will close early.
Fox-Alter says 100% of classrooms in five out of six of the schools are air-conditioned, except Anne M. Dorner School, which is expected to have air conditioning by the fall.