Hanalei, Kauai weather in September 2026

Expect daytime maximum temperatures of 84°F in Hanalei, Kauai, Hawaii in September and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 15 days with some rainfall and typically 5.7 inches of rainfall in the month.

  • 84°F maximum daytime temperature in September in Hanalei, Kauai84
    84°F max day temperature
  • 8 hours of sunshine per day
  • 15 days with some rainfall in September in Hanalei, Kauai15
    15 days with some rainfall
  • 73°F minimum night-time temperature in September in Hanalei, Kauai73
    73°F min night temperature
  • 12 hours of daylight per day in September in Hanalei, Kauai12
    12 hours of daylight per day
  • High heat & humidity in September in Hanalei, KauaiH
    High heat & humidity
  • 5.7 inches monthly rainfall in September in Hanalei, Kauai5.7
    5.7 inches of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Hanalei, Kauai11
    11 (Extreme) UV index
  • 81°F sea temperature in September in Hanalei, Kauai81
    81°F sea temperature

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Hanalei, Kauai by month

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The September weather guide for Hawaii (Hanalei, Kauai) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about the USA

How hot is it in Hanalei, Kauai in September?

Daytime temperatures usually reach 86°F in Hanalei, Kauai in September with high heat and humidity, falling to 72°F at night.

How sunny is it in Hanalei, Kauai in September?

There are normally 9 hours of bright sunshine each day in Hanalei, Kauai in September - that's 74% of daylight hours.

How warm is the sea around Hanalei, Kauai in September?

The average sea temperature around Hanalei, Kauai in September is 81°F.

Does it rain in Hanalei, Kauai in September?

There are usually 8 days with some rain in Hanalei, Kauai in September and the average monthly rainfall is 0.7 inches.

Hanalei, Kauai September sunrise & sunset times

Browse the sunrise and sunset times for Hanalei, Kauai in September 2026. Select a month to view Hanalei, Kauai sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:21 18:54
Tuesday, 15th September 2026 06:25 18:41
Wednesday, 30th September 2026 06:29 18:26

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