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September Weather in Hanama'ulu, United States

Last updated: June 24, 2025

In September, the average temperature in Hanama'ulu, United States hovers around 25°C (78°F), making it a pleasantly warm destination. Expect minimum temperatures around 23°C (73°F) and a maximum of 28°C (83°F). While enjoying the climate, be prepared for about 65 mm (2.5 in) of precipitation spread over 21 days, and a notably high average humidity of 82%, creating a tropical atmosphere.

September Temperature in Hanama'ulu

In September in Hanama'ulu, the average temperature is 25°C (78°F). Maximums can reach 28°C (83°F), while minimums can drop as low as 23°C (73°F). This pleasant weather makes it an ideal time for travelers to explore the area and enjoy outdoor activities.

September Weather in Hanama'ulu: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hanama'ulu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hanama'ulu, September typically has an average temperature of 25°C (78°F), with highs reaching up to 28°C (83°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec727171737476777878777573
Data source: Temperature data for Hanama'ulu 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 Hanama'ulu

In Hanama'ulu in September, the precipitation amount is 65 mm (2.5 in) over the course of 21 days.

September Precipitation Trends in Hanama'ulu

The chart displays monthly precipitation patterns in Hanama'ulu, 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 Hanama'ulu, September typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec60941568063928080659576127
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hanama'ulu

In Hanama'ulu in September, humidity is 82%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit more challenging and encouraging you to seek shade or a cool spot during your travels.

September Average Humidity in Hanama'ulu

This chart illustrates the average monthly humidity levels in Hanama'ulu, 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 Hanama'ulu is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%78%81%82%82%83%83%82%81%80%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hanama'ulu

In Hanama'ulu 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 Hanama'ulu.

Maximum UV Index Levels in Hanama'ulu for September

The chart shows the monthly maximum UV Index (UVI) for Hanama'ulu 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 Hanama'ulu typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710111113121313121087
Data source: Hanama'ulu 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 Hanama'ulu Compares to Other Months

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

This table compares monthly weather conditions in Hanama'ulu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (73°F)60 mm (2.3 inches)78%high
February Weather22°C (71°F)94 mm (3.7 inches)79%very high
March Weather22°C (72°F)156 mm (6.1 inches)78%extreme
April Weather23°C (73°F)80 mm (3.2 inches)81%extreme
May Weather23°C (74°F)63 mm (2.5 inches)82%extreme
June Weather24°C (76°F)92 mm (3.6 inches)82%extreme
July Weather25°C (77°F)80 mm (3.2 inches)83%extreme
August Weather25°C (78°F)80 mm (3.2 inches)83%extreme
September Weather25°C (78°F)65 mm (2.5 inches)82%extreme
October Weather25°C (77°F)95 mm (3.7 inches)81%very high
November Weather24°C (76°F)76 mm (3.0 inches)80%very high
December Weather23°C (74°F)127 mm (5.0 inches)79%high

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