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Topics / Climate / United States / Hawaii

Was September normal in Hawaii?

September 2026 · 5 counties · data family: climatedata.dev

Much warmer than normal

71.1°FStatewide average temperature, September 2026

Every Hawaii county, September 2026September 2026 was warmer than normal in every county with a figure: 4 much warmer, 1 warmer; furthest above normal Hawaii County (+2.6°F), least Honolulu County (+0.5°F).Choose a county to see its answer. The colour shows how far each county was from its own 1991–2020 normal.
Indicator: Monthly average temperature minus the county's 1991–2020 normal for September, °F (NOAA nClimDiv via climatedata.dev); words from each county's rank in its own recordSource: climatedata.dev us-climate, version 2026-10-25.6c7474e6d8; boundaries: U.S. Census Bureau TIGERweb, counties (generalised), ESRI:102007 (Hawaii Albers equal-area); Northwestern Hawaiian Islands not drawn
Every September since 1991, Hawaii statewideSeptember 2026 averaged 71.1°F, +2.1°F against the 1991–2020 normal: the 2nd warmest September of 36 since 1991.
67.068.069.070.071.072.01995200020052010201520202025normal 69.0°F2026: 71.1°F
Indicator: Monthly average temperature, °F (NOAA nClimDiv via climatedata.dev); normal = NOAA's 1991–2020 normal for that monthSource: climatedata.dev us-climate, version 2026-10-25.6c7474e6d8; NOAA Monthly U.S. Climate Divisional Database (nClimDiv), statewide and national files; climatedata.dev county-climate, version 2026-10-25.b4bbb5298a
Show the numbers (36 rows)
YearSeptember average
202671.1°F
202569.4°F
202469.4°F
202369.6°F
202269.4°F
202168.5°F
202069.7°F
201971.6°F
201870.3°F
201769.4°F
201669.6°F
201571.0°F
201470.3°F
201368.9°F
201267.4°F
201167.8°F
201068.1°F
200969.1°F
200867.6°F
200768.5°F
200669.0°F
200569.9°F
200469.8°F
200369.5°F
200268.6°F
200169.5°F
200068.8°F
199967.7°F
199867.3°F
199768.7°F
199668.6°F
199568.6°F
199469.1°F
199368.6°F
199269.2°F
199168.6°F

All 5 counties, September 2026

Record rank: 1 is the warmest September on record for that county.

1Hawaii68.4°F+2.6°F1 of 36Much warmer than normal
2Maui74.9°F+1.5°F3 of 36Much warmer than normal
3Kalawao76.8°F+1.3°F3 of 36Much warmer than normal
4Kauai75.2°F+0.9°F3 of 36Much warmer than normal
5Honolulu77.4°F+0.5°F8 of 36Warmer than normal

Get this data

This page's numbers, as JSON:

curl https://visualizedata.org/data/topics/climate/us-hi.json

The climatedata.dev API it comes from (live, no key; every month since 1895 with its normal, anomaly and rank):

curl "https://api.climatedata.dev/v1/us-climate/tavg/us-hi.json"

Open the JSON

What this can't tell you

  • A statewide average is not the average of its counties: NOAA computes it from its own grid, weighted by area.
  • The most recent months are preliminary and NOAA revises them in the next release.

How the answer is decided

Each month is ranked against the same month in every year on record (since 1895 for most places). The top tenth of the record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'. Counties are coloured by the same five words.

Sources

Every topic for one county: How's Hennepin County?