30 Day Long Range Weather for 60290 Chicago Illinois The weather in Chicago Heights can be unpredictable sometimes. Weather conditions can vary from hazardous heatwaves in the summer to bitterly cold winters that include significant snowfall. It is constantly essential being ready to face any weather conditions within Chicago Heights. Remain informed about the weather forecast in order to prepare your activities accordingly and dress appropriately. Stay safe and make the most of the varied meteorological experiences that Chicago Heights has to offer.