St. Louis, Missouri – Triple-digit temperatures and dangerous humidity will blanket the St. Louis metro through Monday, putting drivers, outdoor workers, and vulnerable residents at risk. Heat index values could reach 108°F, pushing the region into a prolonged and hazardous stretch of summer weather.
According to the National Weather Service in St. Louis, the heat advisory covers eastern Missouri and stretches into southern Illinois, including St. Louis, Belleville, Edwardsville, and surrounding communities. The advisory remains in effect from noon Friday through 8 p.m. Monday. Residents are urged to avoid strenuous activity during peak afternoon hours, stay hydrated, and check on elderly neighbors.
Major travel routes like I-70 and I-55 may see increased roadside emergencies as vehicle engines and tires face extreme heat stress. Public cooling centers are open across the St. Louis metropolitan area, with details available by calling 2-1-1 or the United Way of Greater St. Louis.
Light winds and clear skies will keep nighttime lows in the upper 70s, offering little relief. This can increase the risk of heat exhaustion, especially for those without air conditioning. If possible, reschedule outdoor work to early mornings or evenings, and wear lightweight, breathable clothing.
Five Day Forecast for St. Louis, Missouri
Saturday: Sunny, high 99°F, heat index up to 106°F. Low 77°F.
Sunday: Sunny, high 99°F, heat index near 105°F. Low 77°F.
Monday: Sunny, high 99°F. Heat index up to 108°F. Low 78°F.
Tuesday: 20% chance of storms after 1 p.m., high 99°F. Low 75°F.
Wednesday: Mostly sunny, 30% chance of storms. High 91°F.
