Kauaʻi in September
September is one of the best months to visit Kauaʻi: a typical day grades A, the 2nd best of the 12 months. Expect highs near 86°F, water around 81°F and about a 23% chance of rain on a given day. Beaches are typically busy (Labor Day weekend and Mexican Independence Day). It is hurricane season, with moderate storm risk.
Kauaʻi month by month
Typical grade and high for each month. Higher is better: A+ to F.
- JanA-78°F
- FebA-78°F
- MarA-79°F
- AprA-80°F
- MayA82°F
- JunA84°F
- JulA-85°F
- AugA-86°F
- SepA86°F
- OctA84°F
- NovA82°F
- DecA-79°F
August: A- · September: A · October: A. The best months are usually June, September and October, and the weakest are February and March.
Best beaches in Kauaʻi in September
Resorts with the best typical September, and their grades for the next few days.
| Beach | Typical Sep | This week |
|---|---|---|
| OUTRIGGER Kauaʻi Beach Resort & Spa | A | SatB+SunA-MonA-TueB+WedA- |
| The Royal Sonesta Kaua'i Resort Lihue | A | SatB+SunA-MonA-TueB+WedA- |
| Banyan Harbor Resort | A | SatA-SunBMonB+TueB-WedB+ |
| Kauai Inn | A | SatA-SunBMonB+TueB-WedB+ |
| Koloa Landing Resort at Poipu | A | SatA-SunBMonB+TueBWedB |
| Marriott’s Waiohai Beach Club | A | SatA-SunBMonB+TueBWedB |
| Sheraton Kauai Coconut Beach Resort | A | SatB+SunA-MonA-TueB+WedA- |
| Plantation Hale Suites | A | SatB+SunA-MonA-TueB+WedA- |
Grades for the next few days from Veabird's beach forecast, updated Oct 3, 18:00 UTC. Higher is better: A+ to F.
How it compares
Kauaʻi is among the best-graded beach destinations in September. Every destination in September.
Questions
- Is September a good time to visit Kauaʻi?
- September is one of the best months to visit Kauaʻi: a typical day grades A, the 2nd best of the 12 months. Expect highs near 86°F, water around 81°F and about a 23% chance of rain on a given day. Beaches are typically busy (Labor Day weekend and Mexican Independence Day). It is hurricane season, with moderate storm risk.
- How warm is Kauaʻi in September?
- Typical highs are about 86°F and the sea is about 81°F. That is warm enough for long swims without a wetsuit.
- Is September hurricane season in Kauaʻi?
- September falls in the tropical storm season; the typical risk on a given day is moderate. It peaks in September. Travel insurance and flexible bookings help.
- How crowded is Kauaʻi in September?
- Typically busy, around Labor Day weekend and Mexican Independence Day. The quietest months are usually September and October.
Plan it
Typical-month numbers from Veabird's year-ahead outlook for the 20 resorts here (median resort): 6 years of ERA5 climate normals, the seasonal pattern of the Atlantic sargassum belt, holiday crowd calendars and historical storm tracks. Any given year can differ; check the 16-day forecast before you go.