CHICAGO (WLS) -- Chicago is extending its summer pool plan as sweltering heat and humidity return to the area this weekend.

Fifteen pools are closing on Sunday, as lifeguards go back to school.

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Another 42 pools close on Aug. 17, which is the day before the first day of school.

Chicago's 22 beaches and 19 more neighborhood pools will remain open through Labor Day.

The park district says the pools picked to remain open longer were based on neighborhoods that are the most vulnerable to extreme heat.

And water sprays shut down on Sept. 30. Click here for more from the Chicago Park District .

Some are concerned about staying cool later this month.

"It has always been the case that the lifeguard workforce for the park district is

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