What is the weather like in Kauai in September?

Typical September temperatures in Kauai run about 86/70°F (high/low), with occasional showers.

When is the best time to visit Kauai?

April-May and September-October; summer for north-shore swimming. For the best value, aim for May and October.

Weather, crowds, and prices — and whether September is your month.

Quick answer · Great value

Summer water, autumn calm — a favorite month. Expect highs around 86°F, occasional showers, moderate, and good value.

86/70°F

Typical high / low

Occasional showers

Rain

Moderate

Crowds

Good value

Prices

Best overall: April-May and September-October; summer for north-shore swimming.
Best value: May and October.
Watch out for: Winter (November-March) closes north-shore swimming and brings the most rain.

Month	High/Low	Rain	Crowds	Prices
January	78/62°	Rainy season	Busy	Peak prices
February	78/61°	Regular showers	Busy	Peak prices
March	79/63°	Regular showers	Busy	Peak prices
April	81/65°	Occasional showers	Busy	Above average
May	83/67°	Occasional showers	Moderate	Good value
June	85/69°	Very little rain	Busy	Above average
July	86/71°	Very little rain	Peak crowds	Peak prices
August	87/71°	Very little rain	Peak crowds	Above average
September ←	86/70°	Occasional showers	Moderate	Good value
October	84/68°	Occasional showers	Moderate	Good value
November	81/66°	Regular showers	Moderate	Good value
December	78/63°	Rainy season	Peak crowds	Peak prices

Browse the Kauai guides — the full destination profile, all-inclusive resorts, family trips, and honeymoons — or skip the research entirely.

Want September priced for your exact dates?

Courtney Geisel, an independent travel advisor, prices real Kauai trips every week — free, because resorts pay her, not you.