National Weather ServiceOhioExtreme Heat WarningArchive to October 1, 2026
Extreme Heat Warnings in Ohio
The National Weather Service issued 4 extreme heat warnings for Ohio in 2025 and 4 a year on average in 2008-2025; in 2021-2025 it had the 31st most of any state. 2026 through September: 5, 32% above the average of 4 for those months in 2008-2025. Hamilton was covered most often (31 times since 2008).
How many extreme heat warnings does Ohio get?
Every extreme heat warning that covered part of Ohio. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 5 |
| 2025 | 4 |
| 2024 | 1 |
| 2023 | 6 |
| 2022 | 6 |
| 2021 | 0 |
| 2020 | 0 |
| 2019 | 6 |
| 2018 | 4 |
| 2017 | 1 |
| 2016 | 1 |
| 2015 | 1 |
| 2014 | 0 |
| 2013 | 1 |
| 2012 | 20 |
| 2011 | 12 |
| 2010 | 5 |
| 2009 | 0 |
| 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 Ohio 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 Ohio?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Hamilton | 31 | 4 | June 30, 2026 |
| Montgomery | 21 | 3 | June 30, 2026 |
| Clermont | 16 | 4 | June 30, 2026 |
| Brown | 15 | 2 | June 30, 2026 |
| Butler | 14 | 4 | June 30, 2026 |
| Adams | 14 | 2 | June 30, 2026 |
| Warren | 13 | 4 | June 30, 2026 |
| Scioto | 13 | 1 | June 30, 2026 |
| Pike | 12 | 1 | June 30, 2026 |
| Meigs | 12 | 5 | June 30, 2026 |
| Lawrence | 12 | 5 | June 30, 2026 |
| Gallia | 12 | 5 | June 30, 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 Ohio in AreaZine's record
NWS CharlestonWarningJuly 3, 2026
Extreme Heat Warning: Greenup, Carter, Boyd and 33 more, KY and OH
Expired 8:00 p.m. EDT, July 4, 2026
NWS Northern IndianaWarningJuly 1, 2026
Extreme Heat Warning: Elkhart, Lagrange, Steuben and 38 more, IN and MI
Expired 8:00 p.m. EDT, July 2, 2026
NWS PittsburghWarningJune 30, 2026
Extreme Heat Warning: Tuscarawas, Carroll, Columbiana and 8 more, OH
Expired 10:00 p.m. EDT, July 3, 2026
NWS ClevelandWarningJune 30, 2026
Extreme Heat Warning: Lake, Geauga, Ashtabula Inland and 16 more, OH
Expired 8:00 p.m. EDT, July 2, 2026
NWS WilmingtonWarningJune 30, 2026
Extreme Heat Warning: Wayne, Fayette, Union and 36 more, IN and KY
Expired 8:00 p.m. EDT, July 2, 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 Ohio.