Kauai weather in May
May in Kauai: warm, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Kauai · #134 of 604 destinations to visit in May · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Kauai climate normals — May
| Daytime high | 24°C / 75°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 47 mm / 1.8 in | 🌦 some rain |
| Rainy days | 16 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 16°C / 62°F | |
| Sunshine | 12 h/day | |
| Daylight | 13.2 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 29 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Kauai?
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Kauai in May — FAQ
- Is May a good time to visit Kauai?
- May in Kauai: warm, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Kauai on SeasonMap's comfort score (88/100).
- What is the weather like in Kauai in May?
- In May, Kauai averages a daily high of 24°C and a low of 19.1°C, with about 46.9 mm of rain over roughly 15.8 rainy days.
- What is the air quality in Kauai in May?
- Kauai has a mean US Air Quality Index of about 29 in May.