National Weather ServiceWisconsinHeat AdvisoryArchive to October 1, 2026
Heat Advisories in Wisconsin
The National Weather Service issued 19 heat advisories for Wisconsin in 2025 and 11 a year on average in 2008-2025; in 2021-2025 it had the 33rd most of any state. 2026 through September: 30, 166% above the average of 11 for those months in 2008-2025. Grant was covered most often (51 times since 2008).
How many heat advisories does Wisconsin get?
Every heat advisory that covered part of Wisconsin. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 30 |
| 2025 | 19 |
| 2024 | 10 |
| 2023 | 22 |
| 2022 | 18 |
| 2021 | 10 |
| 2020 | 16 |
| 2019 | 6 |
| 2018 | 18 |
| 2017 | 2 |
| 2016 | 6 |
| 2015 | 2 |
| 2014 | 3 |
| 2013 | 14 |
| 2012 | 23 |
| 2011 | 18 |
| 2010 | 12 |
| 2009 | 4 |
| 2008 | 0 |
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 Wisconsin 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 Wisconsin?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Grant | 51 | 9 | September 4, 2026 |
| Crawford | 47 | 9 | July 13, 2026 |
| Green | 44 | 10 | July 27, 2026 |
| Lafayette | 44 | 10 | July 27, 2026 |
| Rock | 44 | 12 | July 27, 2026 |
| Iowa | 43 | 10 | July 27, 2026 |
| Pierce | 43 | 14 | July 27, 2026 |
| Walworth | 43 | 11 | July 27, 2026 |
| Richland | 42 | 7 | July 13, 2026 |
| Dane | 41 | 10 | July 27, 2026 |
| Jefferson | 41 | 10 | July 27, 2026 |
| La Crosse | 40 | 10 | July 13, 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 Wisconsin.