National Weather ServiceNew HampshireHeat AdvisoryArchive to October 1, 2026
Heat Advisories in New Hampshire
The National Weather Service issued 12 heat advisories for New Hampshire in 2025 and 5 a year on average in 2008-2025; in 2021-2025 it had the 43rd most of any state. 2026 through September: 9, 76% above the average of 5 for those months in 2008-2025. Eastern Hillsborough was covered most often (80 times since 2008).
How many heat advisories does New Hampshire get?
Every heat advisory that covered part of New Hampshire. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 9 |
| 2025 | 12 |
| 2024 | 11 |
| 2023 | 5 |
| 2022 | 5 |
| 2021 | 9 |
| 2020 | 7 |
| 2019 | 3 |
| 2018 | 11 |
| 2017 | 1 |
| 2016 | 2 |
| 2015 | 0 |
| 2014 | 0 |
| 2013 | 11 |
| 2012 | 5 |
| 2011 | 4 |
| 2010 | 5 |
| 2009 | 0 |
| 2008 | 1 |
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 New Hampshire 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 New Hampshire?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Eastern Hillsborough | 80 | 30 | August 7, 2026 |
| Interior Rockingham | 74 | 31 | August 7, 2026 |
| Strafford | 64 | 24 | August 7, 2026 |
| Western And Central Hillsborough | 58 | 19 | July 14, 2026 |
| Coastal Rockingham | 54 | 19 | August 7, 2026 |
| Merrimack | 53 | 17 | July 14, 2026 |
| Cheshire | 47 | 16 | July 14, 2026 |
| Belknap | 45 | 15 | July 14, 2026 |
| Southern Carroll | 39 | 11 | July 14, 2026 |
| Sullivan | 34 | 12 | July 14, 2026 |
| Southern Grafton | 29 | 10 | July 14, 2026 |
| Northern Carroll | 28 | 11 | July 14, 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 New Hampshire.