National Weather ServiceConnecticutHeat AdvisoryArchive to October 1, 2026
Heat Advisories in Connecticut
The National Weather Service issued 22 heat advisories for Connecticut in 2025 and 12 a year on average in 2008-2025; in 2021-2025 it had the 31st most of any state. 2026 through September: 16, 32% above the average of 12 for those months in 2008-2025. Southern Litchfield was covered most often (84 times since 2008).
How many heat advisories does Connecticut get?
Every heat advisory that covered part of Connecticut. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 16 |
| 2025 | 22 |
| 2024 | 17 |
| 2023 | 9 |
| 2022 | 18 |
| 2021 | 25 |
| 2020 | 14 |
| 2019 | 7 |
| 2018 | 27 |
| 2017 | 4 |
| 2016 | 10 |
| 2015 | 4 |
| 2014 | 0 |
| 2013 | 23 |
| 2012 | 11 |
| 2011 | 8 |
| 2010 | 10 |
| 2009 | 1 |
| 2008 | 8 |
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 Connecticut 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 Connecticut?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Southern Litchfield | 84 | 25 | August 6, 2026 |
| Hartford | 80 | 19 | August 6, 2026 |
| Tolland | 76 | 19 | August 6, 2026 |
| Windham | 73 | 18 | August 6, 2026 |
| Northern Litchfield | 67 | 21 | July 14, 2026 |
| Southern Fairfield | 67 | 18 | August 9, 2026 |
| Northern Fairfield | 62 | 19 | August 9, 2026 |
| Northern Middlesex | 61 | 18 | August 9, 2026 |
| Northern New Haven | 61 | 18 | August 9, 2026 |
| Southern New Haven | 55 | 17 | August 9, 2026 |
| Northern New London | 53 | 18 | August 9, 2026 |
| Southern Middlesex | 50 | 16 | August 9, 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 Connecticut.