August · United States
Best time to visit Kauai in August Weather, crowds & prices
Weather in Kauai in August
Average temperature 27°C, 17 mm of rain, about 31 days with 6+ hours of sunshine and 75% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
9.8/10
Ranked #3 of 12 months
- Avg temp
- 27°C
- Rainfall
- 17 mm
- Humidity
- 75%
- Days with 6h+ sun
- 31
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Kauai scores 9.8/10 for beach and coastal travel - one of the top 12-month picks (#3). Expect around 27°C, 17 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Kauai's Na Pali coast, Waimea canyon and rainforest waterfalls make it Hawaii's greenest island.
August is one of the strongest months in Kauai (3rd)
Days in August average 27°C (80°F) and humidity near 75% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
With around 17 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 12.8 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.8/10 (3rd of 12), just behind June at 9.8/10.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Kauai in August?
- In August, Kauai averages 27°C, 17 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.8/10.
- Is August a good time to visit Kauai?
- August earns a 9.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Kauai in August?
- Expect about 17 mm of rain in August. Average humidity is 75% and there are about 31 days with 6+ hours of sunshine.
Curated in Kauai
Tickets & experiences
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Kauai, United States. Live activities and tours from GetYourGuide, matched to this destination.