St. Louis, MO, September 15, 2026 — The St. Louis metropolitan area is currently under the influence of a significant heatwave, with forecasts indicating prolonged periods of very hot and humid weather. Residents are advised to prepare for these conditions, which are expected to persist through Saturday.

Tuesday has been identified as the peak of this heat event. Temperatures are predicted to climb into the upper 90s Fahrenheit. When combined with high humidity levels, the heat index, which measures how hot it feels to the human body, is forecast to exceed 105°F. Such extreme heat poses significant health risks, particularly for vulnerable populations including the elderly, young children, and individuals with pre-existing health conditions.

In addition to the extreme temperatures, there is also a possibility of rain and thunderstorms developing on Tuesday. The National Weather Service has not yet detailed the extent or timing of these potential storm systems, nor has it specified the exact temperature ranges or heat index values beyond the general forecast.

The heatwave is expected to continue its grip on the region for the remainder of the week, with hot and humid conditions likely to remain in place until Saturday. Local authorities and public health officials are urging residents to take precautions to stay safe during this period. These recommendations typically include staying hydrated, limiting outdoor activities during the hottest parts of the day, seeking air-conditioned environments, and checking on neighbors and family members who may be at higher risk.

Specific details regarding weather alerts, cooling center availability, or public advisories related to the heatwave are expected to be updated as the situation develops. The duration of the heatwave is currently projected to extend through Saturday, after which conditions may begin to moderate.


Story summarized from the original created by Angela Hutti on fox2now.com, see more information here.

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