Chicago weather: Sweltering heat returns for one more day

Chicago braces for one more day of 90-degree weather before temperatures gradually decline this week. 

The recent trend of humidity continues with Sunday's high hitting 91 degrees. 

A front will move into the area Monday and Tuesday with waves of showers and a few storms possible. 

The heat and humidity continues Monday, but to a lesser degree with temperatures in the high 80s. The rest of the week will be in the upper 70s.