Chicago IL United States 10Day Weather Forecast The The atmospheric conditions for Chicago Heights can be unpredictable sometimes. The weather can vary from extreme heatwaves in the summer to bitterly cold winters with heavy snowfall. It is constantly vital being prepared to face a variety of weather conditions within Chicago Heights. Stay updated about current weather prediction in order to plan your activities accordingly and attire appropriately. Stay safe and enjoy the varied weather experiences that Chicago Heights has to offer.