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September Weather in Kapaau, United States

Last updated: June 24, 2025

In September, the average temperature in Kapaau, United States hovers around 25°C (77°F), providing a warm and inviting climate. Temperatures can dip to a comfortable 22°C (72°F) at their lowest and reach a pleasant 28°C (83°F) at their peak. Expect some light rain, with an average precipitation of 17 mm (0.7 in) spread over 5 days. Humidity levels are typically high at 84%, adding a touch of tropical warmth to your experience.

September Temperature in Kapaau

In September in Kapaau, the average temperature is 25°C (77°F). Maximum can reach 28°C (83°F) and minimum can be as low as 22°C (72°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy the outdoor activities that Kapaau has to offer.

September Weather in Kapaau: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kapaau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kapaau, September typically has an average temperature of 25°C (77°F), with highs reaching up to 28°C (83°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec727172737476777777767573
Data source: Temperature data for Kapaau generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kapaau

In Kapaau in September, the precipitation amount is 17 mm (0.7 in) over the course of 5 days.

September Precipitation Trends in Kapaau

The chart displays monthly precipitation patterns in Kapaau, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Kapaau, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec38765044377194317473279
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kapaau

In Kapaau in September, humidity is 84%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities challenging and prompting travelers to seek shade and stay hydrated.

September Average Humidity in Kapaau

This chart illustrates the average monthly humidity levels in Kapaau, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Kapaau is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%79%82%83%84%85%85%84%83%82%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kapaau

In Kapaau in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Kapaau.

Maximum UV Index Levels in Kapaau for September

The chart shows the monthly maximum UV Index (UVI) for Kapaau in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Kapaau typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810111212131313121198
Data source: Kapaau September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Kapaau Compares to Other Months

Weather in Kapaau varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kapaau, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Kapaau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (72°F)38 mm (1.5 inches)78%very high
February Weather22°C (71°F)76 mm (3.0 inches)79%very high
March Weather22°C (72°F)50 mm (2.0 inches)79%extreme
April Weather23°C (73°F)44 mm (1.7 inches)82%extreme
May Weather23°C (74°F)37 mm (1.5 inches)83%extreme
June Weather24°C (76°F)7 mm (0.3 inches)84%extreme
July Weather25°C (77°F)19 mm (0.7 inches)85%extreme
August Weather25°C (77°F)43 mm (1.7 inches)85%extreme
September Weather25°C (77°F)17 mm (0.7 inches)84%extreme
October Weather25°C (77°F)47 mm (1.9 inches)83%extreme
November Weather24°C (75°F)32 mm (1.2 inches)82%very high
December Weather23°C (73°F)79 mm (3.1 inches)81%very high

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