Kauai County (Kauai Island)
September
Weather in Kauai County, Hawaii for September 2025
Your guide to Kauai County weather in September - trends and predictions
Until now, September 2025 in Kauai County has been nearly identical to the historical average, with a temperature of 26.3 °F (showing only a slight deviation of -0.1 °F).
The forecast for the next days in Kauai County predicts temperatures to be around 28 °F, close to the historical average.
In general, the average temperature in Kauai County at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 27.4 °F by the end of September.
Kauai County in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 76.8 mm.
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Temperatures
Rain 🌧️
More
10
Dry days
20
Rainy days
0
Snow days
26°/24°
Temperatures
20 km/h
Avg max wind
74 %
Avg humidity
Kauai County Weather September
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Temperatures trend during September in Kauai County
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September weather in Kauai County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy light drizzle | 26° /24° | 1.2 mm | 6 | |
| Sept. 2 |  Patchy rain possible | 26° /24° | 0.3 mm | 6 | |
| Sept. 3 | Patchy rain possible | 27° /24° | 0.5 mm | 7 | |
| Sept. 4 |  Partly cloudy | 26° /24° | 0.2 mm | 7 | |
| Sept. 5 | Patchy rain possible | 26° /24° | 2 mm | 6 | |
| Sept. 6 | Patchy rain possible | 26° /24° | 0.1 mm | 7 | |
| Sept. 7 | Patchy rain possible | 26° /24° | 1.4 mm | 6 | |
| Sept. 8 | Patchy rain possible | 26° /24° | 1.6 mm | 6 | |
| Sept. 9 | Patchy light drizzle | 27° /24° | 5.8 mm | 6 | |
| Sept. 10 | Light rain shower | 26° /24° | 5.4 mm | 6 | |
| Sept. 11 | Patchy rain possible | 27° /24° | 0.1 mm | 6 | |
| Sept. 12 | Patchy rain possible | 27° /24° | 0.7 mm | 6 | |
| Sept. 13 | Patchy rain possible | 27° /24° | 0.8 mm | 6 | |
| Sept. 14 | Light rain shower | 26° /24° | 2.2 mm | 6 | |
| Sept. 15 | Light rain shower | 26° /24° | 2.6 mm | 7 | |
| Sept. 16 | Light rain shower | 27° /24° | 1.8 mm | 6 | |
| Sept. 17 | Patchy rain possible | 26° /24° | 5.6 mm | 6 | |
| Sept. 18 | Patchy rain possible | 28° /23° | 1.2 mm | 2.6 | |
| Sept. 19 | Patchy rain possible | 28° /23° | 2.3 mm | 2.6 | |
| Sept. 20 | Patchy rain possible | 28° /23° | 1.1 mm | 2.3 | |
| Sept. 21 | Patchy rain possible | 28° /23° | 2.8 mm | 2.4 | |
| Sept. 22 | Patchy rain possible | 28° /22° | 0.6 mm | 0 | |
| Sept. 23 | Patchy rain possible | 27° /22° | 0.8 mm | 5 | |
| Sept. 24 | Patchy rain possible | 28° /22° | 0.3 mm | 5 | |
| Sept. 25 | Patchy rain possible | 28° /23° | 0.3 mm | 5 | |
| Sept. 26 | Patchy rain possible | 26° /23° | 1.4 mm | 5 | |
| Sept. 27 | Patchy rain possible | 28° /23° | 0.1 mm | 5 | |
| Sept. 28 | Patchy rain possible | 28° /23° | 0.6 mm | 5 | |
| Sept. 29 | Patchy rain possible | 27° /23° | 1.2 mm | 5 | |
| Sept. 30 | Patchy rain possible | 27° /23° | 0.5 mm | 5 | |
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Important Notice
Our weather forecast for Kauai County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Kauai County forecast closer to your planned date for the most up-to-date weather information.
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Kauai County in September - FAQ
What are the expected maximum and minimum temperatures in Kauai County during September?
During September, expect a variety of temperatures with highs around 26° and lows near 24°, suitable for diverse activities and preferences.
How much rainfall should be expected in Kauai County during September?
Moderate rainfall is anticipated in Kauai County during September, with a total of 76.8 mm spread over approximately 20 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Kauai County during September?
The average wind speed in Kauai County during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Kauai County
Explore the daily rainfall trends and prepare for Kauai Countys September weather 💧
UV exposure in Kauai County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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