Baltimore County will close its non air-conditioned schools on Monday, the district said Sunday. After-school and evening activities at those schools will also be canceled.

The county has a policy to close uncooled schools when the heat index is forecast to be above 90 degrees. Schools were also closed on Friday.

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A high of 91 degrees is forecast for the area on Monday, the National Weather Service said. The heat index is forecast in the low 90s.

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