Clayton County Schools on Tuesday cancelled all outdoor activities and delayed evening football games because of the heat.

The district, which said it made the decision after forecasts predicted weather that could adversely affect student health, cancelled physical education classes, unstructured play and athletic practices.

Middle school football and high school softball games, however, would be played on Tuesday, but with a delayed start time of 6 p.m., the district said.

The school system has cancelled outdoor activities because of heat several times in recent weeks. Clayton Schools has been on heightened awareness of the impacts of heat after the Aug. 13 death of 16-year-old Elite Scholars Academy student Imani Bell. Bell was participating in basketball drills at the school when she collapsed and later died.