Hanalei, Kauai weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Hanalei, Kauai in September. Check more long-term weather averages for Hanalei, Kauai in September before you book your next holiday to Hawaii in 2025/2026.

  • 29°C maximum daytime temperature in September in Hanalei, Kauai29
    29°C max day temperature
  • 8 hours of sunshine per day
  • 15 days with some rainfall in September in Hanalei, Kauai15
    15 days with some rainfall
  • 23°C minimum night-time temperature in September in Hanalei, Kauai23
    23°C 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
  • 144 mm monthly rainfall in September in Hanalei, Kauai144
    144 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Hanalei, Kauai11
    11 (Extreme) UV index
  • 27°C sea temperature in September in Hanalei, Kauai27
    27°C 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Hanalei, Kauai in September?

Daytime temperatures usually reach 29°C in Hanalei, Kauai in September with high heat and humidity, falling to 23°C at night.

How sunny is it in Hanalei, Kauai in September?

There are normally 8 hours of bright sunshine each day in Hanalei, Kauai in September - that's 66% of daylight hours.

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

The average sea temperature around Hanalei, Kauai in September is 27°C.

Does it rain in Hanalei, Kauai in September?

There are usually 15 days with some rain in Hanalei, Kauai in September and the average monthly rainfall is 144mm.

Hanalei, Kauai September sunrise & sunset times

Browse the sunrise and sunset times for Hanalei, Kauai in September 2025. Select a month to view Hanalei, Kauai sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:21 18:54
Monday, 15th September 2025 06:25 18:41
Tuesday, 30th September 2025 06:29 18:26

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