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September Weather in Waipahu, United States

Last updated: June 24, 2025

In September, the average temperature in Waipahu, United States hovers around 26°C (80°F). With minimums dropping to 21°C (71°F) and maximums reaching up to 32°C (89°F), it's a month of warmth. Expect about 26 mm (1.0 in) of precipitation spread over 7 days, and don't forget the average humidity level of 82%, which adds a tropical feel to your experience!

September Temperature in Waipahu

In September in Waipahu, the average temperature is 26°C (80°F). Maximums can reach 32°C (89°F), while minimums can drop to as low as 21°C (71°F). This mild climate makes Waipahu an ideal destination for travelers seeking pleasant weather during this time.

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

The chart illustrates September temperature patterns in Waipahu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waipahu, September typically has an average temperature of 26°C (80°F), with highs reaching up to 32°C (89°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec737272747678797979787673
Data source: Temperature data for Waipahu 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 Waipahu

In Waipahu in September, the total precipitation amount is 26 mm (1.0 in) spread over a period of 7 days.

September Precipitation Trends in Waipahu

The chart displays monthly precipitation patterns in Waipahu, 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 Waipahu, September typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec227677393852282726573279
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Waipahu

In Waipahu in September, humidity is 82%. With an average temperature of 26°C (80°F), this humidity feels like a heavy, warm blanket wrapping around you, making outdoor activities feel more exhausting and sweaty, which can be quite challenging for traveling.

September Average Humidity in Waipahu

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

In Waipahu 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 Waipahu.

Maximum UV Index Levels in Waipahu for September

The chart shows the monthly maximum UV Index (UVI) for Waipahu 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 Waipahu typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810111212131313121187
Data source: Waipahu 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 Waipahu Compares to Other Months

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

This table compares monthly weather conditions in Waipahu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (73°F)22 mm (0.9 inches)78%very high
February Weather22°C (72°F)76 mm (3.0 inches)79%very high
March Weather22°C (73°F)77 mm (3.0 inches)78%extreme
April Weather23°C (74°F)39 mm (1.5 inches)81%extreme
May Weather24°C (76°F)38 mm (1.5 inches)82%extreme
June Weather25°C (78°F)51 mm (2.0 inches)82%extreme
July Weather26°C (79°F)28 mm (1.1 inches)83%extreme
August Weather26°C (80°F)27 mm (1.0 inches)83%extreme
September Weather26°C (80°F)26 mm (1.0 inches)82%extreme
October Weather26°C (78°F)57 mm (2.2 inches)81%extreme
November Weather24°C (76°F)32 mm (1.3 inches)80%very high
December Weather23°C (74°F)79 mm (3.1 inches)79%high

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