Hanalei, Kauai weather in August 2025

Expect 29°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Hanalei, Kauai in August. Check more long-term weather averages for Hanalei, Kauai in August before you book your next holiday to Hawaii in 2025/2026.

  • 29°C maximum daytime temperature in August in Hanalei, Kauai29
    29°C max day temperature
  • 9 hours of sunshine per day
  • 17 days with some rainfall in August in Hanalei, Kauai17
    17 days with some rainfall
  • 23°C minimum night-time temperature in August in Hanalei, Kauai23
    23°C min night temperature
  • 13 hours of daylight per day in August in Hanalei, Kauai13
    13 hours of daylight per day
  • High heat & humidity in August in Hanalei, KauaiH
    High heat & humidity
  • 145 mm monthly rainfall in August in Hanalei, Kauai145
    145 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Hanalei, Kauai11
    11+ (Extreme) UV index
  • 26°C sea temperature in August in Hanalei, Kauai26
    26°C sea temperature

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The August 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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More about the USA

How hot is it in Hanalei, Kauai in August?

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

How sunny is it in Hanalei, Kauai in August?

There are normally 9 hours of bright sunshine each day in Hanalei, Kauai in August - that's 67% of daylight hours.

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

The average sea temperature around Hanalei, Kauai in August is 26°C.

Does it rain in Hanalei, Kauai in August?

There are usually 17 days with some rain in Hanalei, Kauai in August and the average monthly rainfall is 145mm.

Hanalei, Kauai August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 06:10 19:18
Saturday, 16th August 2025 06:16 19:08
Sunday, 31st August 2025 06:21 18:55

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