National Weather ServiceHawaiiFlood AdvisoryArchive to October 1, 2026
Flood Advisories in Hawaii
The National Weather Service issued 91 flood advisories for Hawaii in 2025 and 155 a year on average in 2008-2025; in 2021-2025 it had the 28th most of any state. 2026 through September: 159, 44% above the average of 110 for those months in 2008-2025. Hawaii in Hawaii was covered most often (543 times since 2008).
How many flood advisories does Hawaii get?
Every flood advisory that covered part of Hawaii. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 159 |
| 2025 | 91 |
| 2024 | 102 |
| 2023 | 126 |
| 2022 | 108 |
| 2021 | 183 |
| 2020 | 156 |
| 2019 | 152 |
| 2018 | 297 |
| 2017 | 174 |
| 2016 | 156 |
| 2015 | 287 |
| 2014 | 261 |
| 2013 | 213 |
| 2012 | 65 |
| 2011 | 175 |
| 2010 | 71 |
| 2009 | 105 |
| 2008 | 60 |
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 Hawaii 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 Hawaii?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Hawaii in Hawaii | 543 | 123 | September 27, 2026 |
| Oahu in Honolulu | 409 | 131 | September 8, 2026 |
| Maui | 394 | 0 | May 30, 2016 |
| Maui in Maui | 392 | 68 | February 6, 2025 |
| Hawaii | 366 | 0 | June 14, 2016 |
| Honolulu | 357 | 0 | May 30, 2016 |
| Kauai in Kauai | 199 | 43 | March 18, 2025 |
| Kauai | 174 | 0 | May 27, 2016 |
| Kahoolawe in Maui | 75 | 75 | September 7, 2026 |
| Niihau in Kauai | 38 | 38 | September 30, 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 advisory?
A flood advisory covers flooding that is less serious than a warning, such as water on roads or in low-lying areas, that is still a hazard to drivers and walkers. 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 Hawaii.