May · United States
Best time to visit Kauai in May Weather, crowds & prices
Weather in Kauai in May
Average temperature 25°C, 48 mm of rain, about 31 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
9.4/10
Ranked #7 of 12 months
- Avg temp
- 25°C
- Rainfall
- 48 mm
- Humidity
- 78%
- Days with 6h+ sun
- 31
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Kauai scores 9.4/10 for beach and coastal travel - ranked #7 of 12. Expect around 25°C, 48 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.
May ranks 7th of 12 for Kauai — one of the best windows
With 25°C (76°F) on average, May delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
Budget for roughly 48 mm of rain this month — a flexible day or two helps — with about 31 days with 6+ hours of sunshine and 13.1 hours of daylight to work around it.
On our climate-comfort scale this is one of the strongest months of the year for Kauai at 9.4/10 (7th of 12), just behind June at 9.8/10.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Kauai in May?
- In May, Kauai averages 25°C, 48 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.4/10.
- Is May a good time to visit Kauai?
- May earns a 9.4/10 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 May?
- Expect about 48 mm of rain in May. Average humidity is 78% and there are about 31 days with 6+ hours of sunshine.
Curated in Kauai
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Kauai, United States. Live activities and tours from GetYourGuide, matched to this destination.