The first day of school was a hot one for Chicago Public Schools students.
Today some area schools are closing early because of the expected 90-degree heat.
Schools in west Aurora plan to release students by noon today.
Districts 60 and 90 in Waukegan and Lockport are also closing early.
In Chicago, most schools have air conditioning, but some buildings do not.
Over the summer CPS installed 2,000 air conditioners in schools.
800 fans are also available to keep classrooms cool.
CPS has not announced any plans to shorten the school day.
Teachers and staff are advised to keep cool by closing shades, and moving to cooler rooms.