The high heat index values of 100°F to 105°F (37.8°C to 40.6°C) pose a risk of heat-related illnesses, particularly for those spending extended periods outdoors. The increased moisture in southeastern counties may lead to discomfort and a higher perceived temperature. Students returning to school on Monday should be prepared for hot conditions, as temperatures will remain near triple digits, with the heat index making it feel even hotter. Hydration and sun protection are critical during this period.