National Weather ServiceHawaiiFlash Flood WarningArchive to October 1, 2026
Flash Flood Warnings in Hawaii
The National Weather Service issued 13 flash flood warnings for Hawaii in 2025 and 35 a year on average in 2008-2025; in 2021-2025 it had the 35th most of any state. 2026 through September: 53, 120% above the average of 24 for those months in 2008-2025. Oahu in Honolulu was covered most often (110 times since 2008).
How many flash flood warnings does Hawaii get?
Every flash flood warning that covered part of Hawaii. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 53 |
| 2025 | 13 |
| 2024 | 26 |
| 2023 | 33 |
| 2022 | 15 |
| 2021 | 50 |
| 2020 | 25 |
| 2019 | 21 |
| 2018 | 78 |
| 2017 | 31 |
| 2016 | 35 |
| 2015 | 59 |
| 2014 | 38 |
| 2013 | 47 |
| 2012 | 24 |
| 2011 | 41 |
| 2010 | 23 |
| 2009 | 29 |
| 2008 | 36 |
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 |
|---|---|---|---|
| Oahu in Honolulu | 110 | 34 | September 7, 2026 |
| Honolulu | 101 | 0 | May 26, 2016 |
| Maui in Maui | 84 | 16 | January 31, 2025 |
| Kauai | 83 | 0 | May 27, 2016 |
| Kauai in Kauai | 78 | 15 | November 6, 2024 |
| Hawaii in Hawaii | 73 | 32 | September 10, 2026 |
| Maui | 67 | 0 | May 8, 2016 |
| Hawaii | 52 | 0 | March 26, 2016 |
| Kahoolawe in Maui | 17 | 17 | August 16, 2026 |
| Niihau in Kauai | 11 | 11 | September 30, 2026 |
| Big Island Interior | 1 | 0 | December 27, 2008 |
| Big Island North and East | 1 | 0 | December 27, 2008 |
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 flash flood warnings for Hawaii in AreaZine's record
NWS HonoluluWarningSeptember 9, 2026
Flash Flood Warning: Hawaii in Hawaii, HI
Expired 11:30 p.m. HST, September 9, 2026
NWS HonoluluWarningSeptember 7, 2026
Flash Flood Warning: Kauai, HI
Expired 10:30 p.m. HST, September 7, 2026
NWS HonoluluWarningSeptember 7, 2026
Flash Flood Warning: Kauai, HI
Expired 2:00 p.m. HST, September 7, 2026
NWS HonoluluWarningSeptember 7, 2026
Flash Flood Warning: Kauai, HI
Expired 1:15 p.m. HST, September 7, 2026
NWS HonoluluWarningAugust 16, 2026
Flash Flood Warning: Oahu in Honolulu, HI
Expired 5:45 p.m. HST, August 16, 2026
NWS HonoluluWarningAugust 16, 2026
Flash Flood Warning: Maui, HI
Expired 2:45 p.m. HST, August 16, 2026
NWS HonoluluWarningAugust 16, 2026
Flash Flood Warning: Kauai, HI
Expired 2:45 p.m. HST, August 16, 2026
NWS HonoluluWarningAugust 16, 2026
Flash Flood Warning: Maui, HI
Expired 5:00 a.m. HST, August 16, 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 flash flood warning?
A flash flood warning means flash flooding is happening or about to happen: water rising fast in streams, streets or dry washes, usually within six hours of heavy rain or a dam or levee failure. 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 Hawaii.