Chicago Heights IL Weather Forecast and Conditions The Weather conditions for Chicago Heights can be fluctuating at times. The weather can range from extreme heatwaves in the summer to bitterly cold wintry with heavy snowfall. It is constantly crucial being prepared for any weather conditions within Chicago Heights. Stay up-to-date about current weather prediction to plan your daily routines appropriately and dress appropriately. Stay safe and enjoy the diverse meteorological experiences that Chicago Heights has to offer.