National Weather ServiceNew HampshireFlood WarningArchive to October 1, 2026
Flood Warnings in New Hampshire
The National Weather Service issued 13 flood warnings for New Hampshire in 2025 and 28 a year on average in 2008-2025; in 2021-2025 it had the 41st most of any state. 2026 through September: 8, 62% below the average of 21 for those months in 2008-2025. Grafton was covered most often (179 times since 2008).
How many flood warnings does New Hampshire get?
Every flood warning that covered part of New Hampshire. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 8 |
| 2025 | 13 |
| 2024 | 30 |
| 2023 | 63 |
| 2022 | 20 |
| 2021 | 11 |
| 2020 | 21 |
| 2019 | 27 |
| 2018 | 32 |
| 2017 | 28 |
| 2016 | 5 |
| 2015 | 7 |
| 2014 | 36 |
| 2013 | 11 |
| 2012 | 14 |
| 2011 | 60 |
| 2010 | 82 |
| 2009 | 9 |
| 2008 | 34 |
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 |
|---|---|---|---|
| Grafton | 179 | 41 | June 19, 2026 |
| Merrimack | 124 | 34 | March 17, 2026 |
| Carroll | 105 | 23 | May 30, 2026 |
| Coos | 84 | 16 | March 18, 2025 |
| Hillsborough | 81 | 19 | May 31, 2025 |
| Belknap | 67 | 28 | May 15, 2026 |
| Rockingham | 55 | 12 | May 10, 2025 |
| Sullivan | 51 | 12 | May 10, 2025 |
| Strafford | 51 | 10 | January 11, 2024 |
| Cheshire | 42 | 9 | May 10, 2025 |
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 flood warnings for New Hampshire in AreaZine's record
NWS GrayWarningJune 18, 2026
Flood Warning: Grafton, NH
Expired 11:11 a.m. EDT, June 19, 2026
NWS GrayWarningMay 29, 2026
Flood Warning: Cumberland, Oxford and Carroll, ME and NH
Expired 2:00 p.m. EDT, May 30, 2026
NWS GrayWarningMay 15, 2026
Flood Warning: Belknap and Grafton, NH
Expired 10:26 p.m. EDT, May 15, 2026
NWS GrayWarningMay 15, 2026
Flood Warning: Cumberland, Oxford and Carroll, ME and NH
Expired 11:00 p.m. EDT, May 15, 2026
NWS GrayWarningMay 14, 2026
Flood Warning: Grafton, NH
Expired 11:35 a.m. EDT, May 15, 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 a flood warning?
A flood warning means flooding is happening or about to happen. The NWS issues it both for rivers at forecast points (river flood warnings) and for areas where water ponds or runs off (areal flood warnings); AreaZine counts both. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in New Hampshire.