National Weather ServiceMissouriExtreme Heat WarningArchive to October 1, 2026
Extreme Heat Warnings in Missouri
The National Weather Service issued 19 extreme heat warnings for Missouri in 2025 and 11 a year on average in 2008-2025; in 2021-2025 it had the 9th most of any state. 2026 through September: 26, 142% above the average of 11 for those months in 2008-2025. Dunklin was covered most often (57 times since 2008).
How many extreme heat warnings does Missouri get?
Every extreme heat warning that covered part of Missouri. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 26 |
| 2025 | 19 |
| 2024 | 13 |
| 2023 | 21 |
| 2022 | 15 |
| 2021 | 7 |
| 2020 | 2 |
| 2019 | 8 |
| 2018 | 12 |
| 2017 | 12 |
| 2016 | 11 |
| 2015 | 12 |
| 2014 | 1 |
| 2013 | 0 |
| 2012 | 12 |
| 2011 | 19 |
| 2010 | 19 |
| 2009 | 5 |
| 2008 | 5 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Missouri get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Missouri?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Dunklin | 57 | 25 | August 12, 2026 |
| Pemiscot | 55 | 25 | August 12, 2026 |
| Platte | 43 | 11 | September 7, 2026 |
| Jackson | 43 | 11 | September 7, 2026 |
| Clay | 43 | 11 | September 7, 2026 |
| Bates | 36 | 11 | September 7, 2026 |
| Jasper | 35 | 13 | September 4, 2026 |
| Cass | 35 | 11 | September 7, 2026 |
| Barton | 34 | 13 | September 4, 2026 |
| Vernon | 33 | 13 | September 4, 2026 |
| Newton | 32 | 12 | September 4, 2026 |
| Henry | 32 | 10 | September 6, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest extreme heat warnings for Missouri in AreaZine's record
NWS Kansas City/Pleasant HillWarningSeptember 6, 2026
Extreme Heat Warning: Atchison, Miami, Linn and 8 more, KS and MO
Expired 8:00 p.m. CDT, September 8, 2026
NWS Kansas City/Pleasant HillWarningSeptember 5, 2026
Extreme Heat Warning: Atchison, Miami, Linn and 8 more, KS and MO
Expired 8:00 p.m. CDT, September 8, 2026
NWS SpringfieldWarningSeptember 5, 2026
Extreme Heat Warning: Bourbon, Crawford, Cherokee and 34 more, KS and MO
Expired 8:00 p.m. CDT, September 6, 2026
NWS St LouisWarningSeptember 3, 2026
Extreme Heat Warning: Greene, Macoupin, Montgomery and 36 more, IL and MO
Expired 8:00 p.m. CDT, September 5, 2026
NWS Quad Cities IAWarningSeptember 2, 2026
Extreme Heat Warning: Iowa, Johnson, Cedar and 21 more, IA and IL
Expired 7:00 p.m. CDT, September 4, 2026
NWS PaducahWarningSeptember 1, 2026
Extreme Heat Warning: Jefferson, Wayne, Edwards and 55 more, IL and IN
Expired 8:00 p.m. CDT, September 5, 2026
NWS PaducahWarningAugust 14, 2026
Extreme Heat Warning: Jefferson, Wayne, Edwards and 55 more, IL and IN
Expired 8:00 p.m. CDT, August 16, 2026
NWS St LouisWarningAugust 14, 2026
Extreme Heat Warning: Clinton, Washington, Randolph and 23 more, IL and MO
Expired 9:00 p.m. CDT, August 15, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is an extreme heat warning?
An extreme heat warning means dangerous heat is expected, measured by heat index or temperature thresholds each office sets. It replaced the excessive heat warning in 2025. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. AreaZine's counts include the excessive heat warnings issued before the change. The national record · Every warning type in Missouri.