September Weather in Kapolei, United States

Last updated: June 24, 2025

In Kapolei, United States, the average temperature in September is a comfortable 26°C (79°F), with minimums dipping to 24°C (75°F) and maximums reaching 28°C (83°F). Expect about 18 mm (0.7 in) of precipitation over 3 days, while the air retains an average humidity level of 82%. Enjoy the warmth and prepare for occasional showers!

September Temperature in Kapolei

In September in Kapolei, the average temperature is a pleasant 26°C (79°F). Maximums can reach up to 28°C (83°F), while minimums can dip to as low as 24°C (75°F). This mild climate makes it an ideal time to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Kapolei, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kapolei, September typically has an average temperature of 26°C (79°F), with highs reaching up to 28°C (83°F) and lows dropping to around 24°C (75°F).

Data source: Temperature data for Kapolei generated using information from the Copernicus Climate Change Service.

September Precipitation in Kapolei

In Kapolei in September, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

September Precipitation Trends in Kapolei

The chart displays monthly precipitation patterns in Kapolei, 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 Kapolei, September typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Kapolei

In Kapolei in September, humidity is 82%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket that envelops you, making outdoor activities feel more taxing and requiring frequent breaks to stay hydrated.

September Average Humidity in Kapolei

This chart illustrates the average monthly humidity levels in Kapolei, 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 Kapolei is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kapolei

In Kapolei 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 Kapolei.

Maximum UV Index Levels in Kapolei for September

The chart shows the monthly maximum UV Index (UVI) for Kapolei 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 Kapolei typically reaches 12, which falls under the extreme exposure category.

Data source: Kapolei 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 Kapolei Compares to Other Months

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

This table compares monthly weather conditions in Kapolei, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	13 mm (0.5 inches)	78%	very high
February Weather	22°C (73°F)	58 mm (2.3 inches)	79%	very high
March Weather	23°C (73°F)	64 mm (2.5 inches)	78%	extreme
April Weather	23°C (75°F)	28 mm (1.1 inches)	81%	extreme
May Weather	24°C (76°F)	23 mm (0.9 inches)	82%	extreme
June Weather	25°C (78°F)	33 mm (1.3 inches)	82%	extreme
July Weather	26°C (79°F)	11 mm (0.4 inches)	83%	extreme
August Weather	26°C (79°F)	13 mm (0.5 inches)	83%	extreme
September Weather	26°C (79°F)	18 mm (0.7 inches)	82%	extreme
October Weather	26°C (78°F)	43 mm (1.7 inches)	81%	extreme
November Weather	25°C (77°F)	22 mm (0.9 inches)	80%	very high
December Weather	24°C (75°F)	63 mm (2.5 inches)	79%	high