Hawaii heat wave risk
Hawaii County has the highest heat wave risk in Hawaii, scoring 0 out of 100 — rated "No Rating" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Hawaii County | 0 | No Rating | 0 |
| 2 | Honolulu County | 0 | No Rating | 0 |
| 3 | Kalawao County | 0 | No Rating | 0 |
| 4 | Kauai County | 0 | No Rating | 0 |
| 5 | Maui County | 0 | No Rating | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Heat Wave risk nationally:
Other hazard risks in Hawaii:
Frequently asked questions
What is the highest heat wave risk county in Hawaii?
Hawaii County, HI has the highest heat wave risk in Hawaii, with a FEMA National Risk Index score of 0 out of 100 (rated "No Rating").
What causes heat wave risk in Hawaii?
Heat is consistently the leading cause of weather-related mortality in the US, yet it remains underrepresented in federal disaster declarations relative to its actual impact. High scores reflect a combination of extreme temperature exposure, population vulnerability (elderly, outdoor workers), and limited access to cooling infrastructure.