Hawaii weather by county

5 counties · records since 1895, through September 2026.

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Hawaii in September 2026

3 of 5 counties ran at least 1° warmer than usual in September 2026, and 0 ran at least 1° cooler.
Warmest against its own records: Hawaii County (1st-warmest September of 36). Even the least warm, Honolulu County, had its 8th-warmest.
Wettest September against its records: Kauai County, 17.6 inches (1st-wettest).
No county was in moderate drought or worse on NOAA's Palmer reading for September.
Since 1970 the state's counties have warmed about 0.4° per decade on average, Hawaii County the most at 0.5°.

This week's forecast against the usual, and every month since 1895, for all 5 counties in Hawaii. 5 had a top-10 warm September in 2026.