Kauai weather in December
December in Kauai: warm, rainy, with clean air — a great time to visit.
#12 of 12 months in Kauai · #189 of 604 destinations to visit in December · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Kauai climate normals — December
| Daytime high | 23°C / 73°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 98 mm / 3.9 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 16°C / 62°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 10.8 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 28 | 🍃 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 December — FAQ
- Is December a good time to visit Kauai?
- December in Kauai: warm, rainy, with clean air — a great time to visit. It ranks #12 of 12 months for Kauai on SeasonMap's comfort score (78/100).
- What is the weather like in Kauai in December?
- In December, Kauai averages a daily high of 22.9°C and a low of 18.9°C, with about 98 mm of rain over roughly 14.8 rainy days.
- What is the air quality in Kauai in December?
- Kauai has a mean US Air Quality Index of about 28 in December.