National Weather ServiceNew HampshireFlood WatchArchive to October 1, 2026
Flood Watches in New Hampshire
The National Weather Service issued 5 flood watches for New Hampshire in 2025 and 9 a year on average in 2008-2025; in 2021-2025 it had the 44th most of any state. 2026 through September: 5, 29% below the average of 7 for those months in 2008-2025. Northern Carroll was covered most often (97 times since 2008).
How many flood watches does New Hampshire get?
Every flood watch that covered part of New Hampshire. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 5 |
| 2025 | 5 |
| 2024 | 11 |
| 2023 | 22 |
| 2022 | 5 |
| 2021 | 3 |
| 2020 | 4 |
| 2019 | 7 |
| 2018 | 7 |
| 2017 | 4 |
| 2016 | 1 |
| 2015 | 3 |
| 2014 | 12 |
| 2013 | 13 |
| 2012 | 6 |
| 2011 | 17 |
| 2010 | 14 |
| 2009 | 8 |
| 2008 | 16 |
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 |
|---|---|---|---|
| Northern Carroll | 97 | 31 | June 18, 2026 |
| Northern Grafton | 96 | 31 | June 18, 2026 |
| Southern Grafton | 92 | 29 | July 29, 2026 |
| Southern Carroll | 91 | 28 | July 29, 2026 |
| Merrimack | 89 | 28 | July 29, 2026 |
| Belknap | 83 | 25 | July 29, 2026 |
| Southern Coos | 82 | 27 | June 18, 2026 |
| Sullivan | 79 | 24 | July 29, 2026 |
| Eastern Hillsborough | 78 | 27 | July 29, 2026 |
| Strafford | 76 | 22 | July 29, 2026 |
| Interior Rockingham | 75 | 21 | July 29, 2026 |
| Western And Central Hillsborough | 74 | 26 | July 29, 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 flood watch?
A flood watch means conditions may lead to flooding in the coming day or days; it is not yet happening. A watch means the conditions for the hazard are possible or favourable, but it is not yet happening: be ready to act if a warning follows. The national record · Every warning type in New Hampshire.