Weather
Missouri Weather: St. Louis Swelters Under 109-Degree Heat Index With Severe Storm Risk
St. Louis, Missouri – An intense heat advisory is in effect today as heat index values reach as high as 109 degrees in some parts of the region. Alongside the…
By Cameron Hayes · 2026-09-15T12:05:26.320Z
St. Louis, Missouri – An intense heat advisory is in effect today as heat index values reach as high as 109 degrees in some parts of the region. Alongside the extreme heat, a significant threat of severe storms, including damaging winds and pockets of heavy rain, is expected north of I 70 through tonight.
According to the National Weather Service, the most dangerous conditions—a mix of extreme heat and the potential for severe storms—will continue through Friday. Residents are encouraged to review their specific location's hourly forecast at weather.gov . The combination of heat stress and storm hazards makes today particularly dangerous for outdoor work and travel.
The threat of heavy rain is highest from early evening through early Wednesday morning, potentially leading to localized flooding. This hot and humid weather pattern is expected to linger until the weekend, when temperatures are forecast to fall and humidity levels should finally become more tolerable.
Stay vigilant and prioritize safety by limiting outdoor exposure during the peak of the heat, and remain ready for potential storm alerts tonight.