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September Weather in Kalaheo, United States

Last updated: June 24, 2025

In September, the average temperature in Kalaheo, United States hovers around 25°C (78°F), offering a pleasant climate. You can expect temperatures to range from a minimum of 21°C (71°F) to a maximum of 30°C (86°F). However, don't forget your umbrella; there's an average precipitation of 49 mm (1.9 in) over 16 days. With an average humidity level of 82%, the air is pleasantly warm yet comfortably humid.

September Temperature in Kalaheo

In September in Kalaheo, the average temperature is 25°C (78°F). Maximums can reach 30°C (86°F), while minimums can be as low as 21°C (71°F). This pleasant climate makes Kalaheo an ideal destination for travelers seeking warm and enjoyable weather during their visit.

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

The chart illustrates September temperature patterns in Kalaheo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kalaheo, September typically has an average temperature of 25°C (78°F), with highs reaching up to 30°C (86°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec717070727476777878767472
Data source: Temperature data for Kalaheo 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 Kalaheo

In Kalaheo in September, the precipitation amount is 49 mm (1.9 in) spread over 16 days.

September Precipitation Trends in Kalaheo

The chart displays monthly precipitation patterns in Kalaheo, 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 Kalaheo, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec3984136625280545449895597
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kalaheo

In Kalaheo 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 Kalaheo

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

In Kalaheo 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 Kalaheo.

Maximum UV Index Levels in Kalaheo for September

The chart shows the monthly maximum UV Index (UVI) for Kalaheo 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 Kalaheo typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810111213131313121087
Data source: Kalaheo 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 Kalaheo Compares to Other Months

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

This table compares monthly weather conditions in Kalaheo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (71°F)38 mm (1.5 inches)78%very high
February Weather21°C (70°F)84 mm (3.3 inches)79%very high
March Weather21°C (71°F)136 mm (5.4 inches)78%extreme
April Weather22°C (73°F)61 mm (2.4 inches)81%extreme
May Weather23°C (74°F)52 mm (2.1 inches)82%extreme
June Weather24°C (76°F)80 mm (3.1 inches)82%extreme
July Weather25°C (77°F)54 mm (2.1 inches)83%extreme
August Weather25°C (78°F)54 mm (2.1 inches)83%extreme
September Weather25°C (78°F)49 mm (1.9 inches)82%extreme
October Weather25°C (76°F)89 mm (3.5 inches)81%very high
November Weather24°C (75°F)55 mm (2.2 inches)80%very high
December Weather22°C (72°F)97 mm (3.8 inches)79%high

Compare Kalaheo's Climate with Cities Worldwide