Monthly Weather in Chicago Heights Illinois 30 Days ForecastWeather conditions for Chicago Heights are fluctuating at times. The weather can range between hazardous heat waves in the summer to bitterly cold wintry with significant snowfall. It's consistently crucial to be prepared to face any climate conditions in Chicago Heights. Stay informed about the weather forecast in order to plan your activities accordingly and attire appropriately. Stay secure and make the most of the varied meteorological experiences that Chicago Heights has to offer.