First published 9/18/2026, 8:44:15 PM · Last updated 9/18/2026, 8:44:15 PM

Heat Advisory issued September 18 at 2:00PM CDT until September 19 at 8:00PM CDT by NWS St Louis MO

The National Weather Service St. Louis issued a Heat Advisory effective from 2026-09-18T19:00:00Z (2:00 PM CDT Sep 18) through 2026-09-20T01:00:00Z (8:00 PM CDT Sep 19) for the St. Louis, Missouri area. Expect elevated heat and humidity with increased risk of heat-related illness for outdoor workers, older adults, young children, and those without cooling.

Categories: severe-weather-and-natural-disasters, public-health

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 9/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 5/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 6/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 5/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 8/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Heat advisories indicate conditions that can cause heat exhaustion or heat stroke, strain public-health and emergency services, and affect outdoor events and travel. Vulnerable populations and people doing prolonged outdoor work are at higher risk.

Location

Sources

Heat Advisory issued September 18 at 2:00PM CDT until September 19 at 8:00PM CDT by NWS St Louis MO

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