30 Day Long Range Weather for Chicago Illinois Weather The atmospheric conditions in Chicago Heights can be varying from time to time. The weather can range between hazardous heatwaves in the summer to extremely cold wintry with significant snowfall. It's consistently crucial being prepared for any climate conditions in Chicago Heights. Stay up-to-date about current atmospheric prediction to plan your daily routines appropriately and attire appropriately. Keep safe and make the most of the varied weather experiences that Chicago Heights has to offer.