Climate in Chicago Heights Illinois Sperling's BestPlacesThe weather for Chicago Heights are unpredictable occasionally. The weather can range from extreme heat waves in the summer to extremely cold wintry with significant snowfall. It's always essential to be ready for any weather conditions within Chicago Heights. Remain updated about current atmospheric forecast to plan your activities appropriately and attire appropriately. Stay safe and enjoy the varied meteorological experiences that Chicago Heights has to offer.