Residents in Washington, D.C., and surrounding areas should prepare for unusually high temperatures for this time of year. The heat index in the lower 90s (32-34°C) could pose risks for heat-sensitive individuals, including the elderly, children, and those with pre-existing health conditions. Outdoor activities may become uncomfortable or even hazardous during peak afternoon hours. The abrupt temperature swing could also lead to discomfort for those unprepared for the heat, especially given the seasonally cooler mornings and evenings.