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
  29°C max day temperature
• 9
  9 hours of sunshine per day
• 17
  17 days with some rainfall
• 23
  23°C min night temperature
• 13
  13 hours of daylight per day
• H
  High heat & humidity
• 145
  145 mm of monthly rainfall
• 11
  11+ (Extreme) UV index
• 26
  26°C sea temperature

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Hanalei, Kauai by month

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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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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.

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