Chicago Heights IL Hourly Weather The weather for Chicago Heights can be unpredictable occasionally. The weather can vary from hazardous heatwaves in the summer to extremely cold winters that include heavy snowfall. It is constantly important being ready to face any weather conditions in Chicago Heights. Remain up-to-date about current weather forecast to plan your daily routines appropriately and attire appropriately. Keep secure and make the most of the diverse meteorological experiences that are Chicago Heights has to offer.