Kauai in September
September in Kauai brings highs around 85°F (30°C), lows near 75°F and about 16 rainy days. The sun sets around 6:42 pm. The sea is about 80°F (27°C). It's off season for sightseeing: wet and quieter.
Photo: Jim Bahn, CC BY 2.0
What September is good for in Kauai
Each activity rated for September's weather and sea.
SnorkelingGood in September
Scuba divingGood in September
Cooking classesAny month
Boat toursFair in September
Sunset cruisesFair in September
Kayak toursFair in September
Zipline toursOff season in September
ATV toursOff season in September
Jeep toursOff season in September
Helicopter toursOff season in September
September next to August and October
| Month | August | September | October |
|---|---|---|---|
| High | 85°F (30°C) | 85°F (30°C) | 84°F (29°C) |
| Low | 75°F (24°C) | 75°F (24°C) | 74°F (23°C) |
| Rainy days | 18 | 16 | 17 |
| Sea | 80°F | 80°F | 80°F |
| Sunset | 7:10 pm | 6:42 pm | 6:14 pm |
| Daylight | 12 h 54 min | 12 h 17 min | 11 h 40 min |
Averages for Lihue Airport, Hawaii, 1991–2020; sunrise and sunset on the 15th. Kauai water temperature by month.
Tours in Kauai
Kauai: NaPali Boat Tour on the Amelia KFrom $227View 
Kauai Chocolate Farm Tasting TourFrom $145View 
Kauai: Waimea Town, Wailua River Cruise & Fern Grotto TourFrom $279View
Tours from Viator. Good Outing may earn a commission when you book, at no cost to you.
Questions
Is September a good time to visit Kauai?
It's off season for sightseeing: wet and quieter. The most comfortable months overall are January and February.
How hot is Kauai in September?
Average highs are about 85°F (30°C) and lows about 75°F (24°C).
Does it rain much in Kauai in September?
September averages 16 rainy days, against 19 in the wettest month.
How warm is the sea in Kauai in September?
About 80°F (27°C). Warm enough for long swims and snorkeling.
