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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Kauai’s weather, as shown in the live forecast above, is typically warm and humid year-round, with frequent trade-wind showers on the windward (north and east) coasts and sunnier conditions on the leeward (south and west) side. The island’s microclimates mean conditions can shift dramatically from one beach to the next.
What is the best time of year to visit Kauai?
The driest and sunniest months are April through October, when trade winds are steady and rainfall is lower, especially on the south shore around Poipu. For Kauai weather by month, winter (November to March) brings more rain and bigger surf, though temperatures remain pleasant, ranging from 18°C to 27°C. If you’re checking Kauai weather December, expect occasional heavy showers and cooler evenings, but still far warmer than a Canadian winter.
How does the weather vary across the island?
Mount Waialeale, one of the wettest spots on Earth, soaks the north and interior, while Poipu on the south shore often sees Kauai weather Poipu conditions that are sunnier and drier. For a quick snapshot of the next week and a half, look at the weather in Kauai 10 days forecast above. Longer-range outlooks, such as a Kauai weather forecast 21 day or Kauai weather 15 day projection, are general trends—tropical weather is notoriously changeable beyond a week.
Is Kauai weather in Celsius?
Yes, the live forecast above and all our reporting use Celsius. Kauai weather Celsius readings typically range from 18°C at night to 29°C in the afternoon, making it comfortable for swimming and hiking year-round.
Where can I find a Poipu Kauai weather 15 day forecast?
The live forecast above provides a 15-day outlook for Poipu. Because tropical systems are hard to predict far in advance, consider the Poipu Kauai weather 15 day forecast as a general guide—check back closer to your trip for more reliable details.
How does Kauai weather compare to Canadian weather?
Kauai’s tropical climate is a world apart from Canada’s four seasons. While we bundle up for winter, Kauai stays warm and humid. For a taste of home, check our Canada weather hub or Vancouver Weather for a milder Canadian comparison.