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September Weather in Wailuku, United States

Last updated: June 24, 2025

In September, the average temperature in Wailuku, United States hovers around 27°C (80°F), with a comfortable minimum of 23°C (73°F) and a peak of 32°C (89°F). Expect some light rain, as precipitation amounts to 17 mm (0.7 in) spread over 4 days. With an average humidity of 84%, the atmosphere is pleasantly warm, perfect for enjoying the sights!

September Temperature in Wailuku

In September in Wailuku, the average temperature is 27°C (80°F), with maximums reaching 32°C (89°F) and minimums dropping as low as 23°C (73°F). This makes it an ideal time for travelers seeking warm weather and pleasant conditions.

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

The chart illustrates September temperature patterns in Wailuku, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wailuku, September typically has an average temperature of 27°C (80°F), with highs reaching up to 32°C (89°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec747373757779798080797775
Data source: Temperature data for Wailuku 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 Wailuku

In Wailuku in September, the precipitation amount is 17 mm (0.7 in) over a span of 4 days.

September Precipitation Trends in Wailuku

The chart displays monthly precipitation patterns in Wailuku, 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 Wailuku, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec327552493611232517402545
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wailuku

In Wailuku in September, humidity is 84%. With an average temperature of 27°C (80°F), this humidity feels like a thick, warm blanket enveloping you, making travel feel sluggish and exhausting.

September Average Humidity in Wailuku

This chart illustrates the average monthly humidity levels in Wailuku, 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 Wailuku 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 Wailuku

In Wailuku 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 Wailuku.

Maximum UV Index Levels in Wailuku for September

The chart shows the monthly maximum UV Index (UVI) for Wailuku 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 Wailuku typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710111212131313121188
Data source: Wailuku 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 Wailuku Compares to Other Months

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

This table compares monthly weather conditions in Wailuku, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)32 mm (1.3 inches)78%high
February Weather23°C (73°F)75 mm (2.9 inches)79%very high
March Weather23°C (74°F)52 mm (2.0 inches)79%extreme
April Weather24°C (75°F)49 mm (1.9 inches)82%extreme
May Weather25°C (77°F)36 mm (1.4 inches)83%extreme
June Weather26°C (79°F)11 mm (0.4 inches)84%extreme
July Weather26°C (80°F)23 mm (0.9 inches)85%extreme
August Weather27°C (80°F)25 mm (1.0 inches)85%extreme
September Weather27°C (80°F)17 mm (0.7 inches)84%extreme
October Weather26°C (79°F)40 mm (1.6 inches)83%extreme
November Weather25°C (77°F)25 mm (1.0 inches)82%very high
December Weather24°C (75°F)45 mm (1.8 inches)81%very high

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