National Weather ServiceNew HampshireFlash Flood WatchArchive to October 1, 2026
Flash Flood Watches in New Hampshire
The National Weather Service issued 0 flash flood watches for New Hampshire in 2025 and 4 a year on average in 2008-2025; in 2021-2025 it had the 43rd most of any state. 2026 through September: 0, 100% below the average of 4 for those months in 2008-2025. Cheshire was covered most often (41 times since 2008).
How many flash flood watches does New Hampshire get?
Every flash flood watch that covered part of New Hampshire. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 0 |
| 2025 | 0 |
| 2024 | 0 |
| 2023 | 0 |
| 2022 | 0 |
| 2021 | 7 |
| 2020 | 2 |
| 2019 | 3 |
| 2018 | 3 |
| 2017 | 5 |
| 2016 | 2 |
| 2015 | 0 |
| 2014 | 11 |
| 2013 | 20 |
| 2012 | 6 |
| 2011 | 2 |
| 2010 | 1 |
| 2009 | 8 |
| 2008 | 10 |
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 |
|---|---|---|---|
| Cheshire | 41 | 0 | September 2, 2021 |
| Western And Central Hillsborough | 40 | 0 | October 31, 2021 |
| Merrimack | 39 | 0 | October 31, 2021 |
| Southern Grafton | 38 | 0 | October 31, 2021 |
| Northern Carroll | 37 | 0 | October 31, 2021 |
| Belknap | 36 | 0 | October 31, 2021 |
| Eastern Hillsborough | 36 | 0 | October 31, 2021 |
| Southern Carroll | 36 | 0 | October 31, 2021 |
| Northern Grafton | 35 | 0 | August 19, 2021 |
| Sullivan | 35 | 0 | August 19, 2021 |
| Southern Coos | 33 | 0 | August 1, 2021 |
| Strafford | 30 | 0 | October 31, 2021 |
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 flash flood watch?
A flash flood watch means the rain or conditions that lead to flash flooding are possible in the coming hours. Since 2022 most NWS offices issue a flood watch in its place: the national count fell from 692 in 2021 to 76 in 2022, while flood watches rose from 203 to 715 (IEM archive), so compare the two together. 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.