National Weather ServiceIowaHeat AdvisoryArchive to October 1, 2026
Heat Advisories in Iowa
The National Weather Service issued 39 heat advisories for Iowa in 2025 and 25 a year on average in 2008-2025; in 2021-2025 it had the 16th most of any state. 2026 through September: 34, 39% above the average of 25 for those months in 2008-2025. Lee was covered most often (105 times since 2008).
How many heat advisories does Iowa get?
Every heat advisory that covered part of Iowa. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 34 |
| 2025 | 39 |
| 2024 | 41 |
| 2023 | 19 |
| 2022 | 38 |
| 2021 | 35 |
| 2020 | 25 |
| 2019 | 18 |
| 2018 | 32 |
| 2017 | 21 |
| 2016 | 18 |
| 2015 | 19 |
| 2014 | 10 |
| 2013 | 14 |
| 2012 | 28 |
| 2011 | 33 |
| 2010 | 36 |
| 2009 | 12 |
| 2008 | 3 |
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 Iowa 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 Iowa?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Lee | 105 | 27 | August 31, 2026 |
| Des Moines | 102 | 26 | August 31, 2026 |
| Van Buren | 102 | 27 | August 31, 2026 |
| Henry | 100 | 26 | August 31, 2026 |
| Jefferson | 98 | 26 | August 31, 2026 |
| Washington | 93 | 24 | August 31, 2026 |
| Louisa | 92 | 24 | August 31, 2026 |
| Keokuk | 91 | 23 | August 31, 2026 |
| Fremont | 90 | 22 | September 8, 2026 |
| Mills | 88 | 21 | September 8, 2026 |
| Page | 87 | 22 | September 8, 2026 |
| Muscatine | 84 | 22 | August 31, 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.
What is a heat advisory?
A heat advisory means heat that can make people ill, especially those without cooling, below the office's extreme heat warning values. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Iowa.