The high heat and humidity pose a significant risk of heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. Outdoor workers and individuals engaging in physical activities are also at increased risk. Prolonged exposure to these conditions without proper precautions can lead to heat exhaustion or heat stroke, which can be life-threatening. Residents are advised to stay vigilant and monitor their health and that of others, especially neighbors and family members who may be more susceptible to the heat. (Source: ABC7 Chicago, published 2026-09-04 09:52 GMT)