South Chicago Heights IL 10Day Weather Forecast The The weather in Chicago Heights can be varying occasionally. Weather conditions can range from hazardous heatwaves in the summer to bitterly cold wintry that include heavy snowfall. It's consistently crucial being prepared for a variety of climate conditions within Chicago Heights. Remain updated about current weather forecast in order to plan your activities appropriately and attire suitably. Keep secure and make the most of the varied meteorological experiences that are Chicago Heights has to offer.