Kauai, USA

Kauai sits under a tropical sky in USA, and the 2015–2024 weather record gives its sunshine a clear shape: the August peak reaches an 88/100 sun score, with daytime highs around 25°C — a solid base for a trip built around landscapes and trails.

Across a typical year, afternoon temperatures swing between 21°C (February) and 25°C (August). Rain is most likely in July, when about 94% of days see meaningful rainfall, and least likely in January (56%). If 24°C is your bar for proper warmth, count on June–October.

Season by season (on the northern calendar), spring brings 22°C highs with 85% rain-day odds, summer 25°C at 90%, autumn 24°C at 85%, and winter 22°C at 68%. Summer wins on the numbers and winter loses them; everything in between is a trade-off between warmth and crowds. A practical compromise is June — the edge of the warm window, averaging 24°C with an 86 sun score.

Best months to visit Kauai

Our month-by-month scoring puts August first (88/100), with June (86) and September (86) close behind. Anything in January–December clears our 70-point reliability bar. The month to avoid on pure weather odds is March (78/100).

For context: in August, Kauai is drier than 4% of the tropical destinations we track.

Month-by-month breakdown for Kauai → · More destinations for August →

The live forecast backs this up: of the next 16 days, none look mostly clear and 11 carry meaningful rain risk, in a 14–24°C band. Today's cached sun score is 78/100.