September Weather in Kahaluu-Keauhou, United States

Last updated: February 24, 2025

September in Kahaluu-Keauhou, United States, is characterized by a warm and humid tropical climate, with maximum temperatures reaching 27°C (81°F) and an average of 23°C (73°F). The weather is generally pleasant, though it can be quite wet, evidenced by monthly precipitation totaling 318 mm (12.5 in) across approximately 28 days of rain. This results in an average humidity level of 82%, contributing to the lush, vibrant landscapes typical of this beautiful locale. Visitors can expect a tropical paradise, but be prepared for the frequent showers that accompany the season.

September Temperature in Kahaluu-Keauhou

In Kahaluu-Keauhou, September ushers in the final stretch of summer with temperatures that trend upward. The month sees minimums around 20°C (68°F) and an average of 23°C (73°F), making it one of the warmest periods of the year. Daytime highs peak at 27°C (81°F), offering a perfect backdrop for beach activities and outdoor adventures. As the heat starts to wane into October, September provides a vibrant blend of warmth and comfort, reflecting the tropical paradise that Hawaii is known for. Overall, it's a time when visitors can truly soak in the sun before the cooler autumn breezes set in.

September Weather in Kahaluu-Keauhou: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kahaluu-Keauhou, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec686868707071737373737270
Data source: Temperature data for Kahaluu-Keauhou 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 Kahaluu-Keauhou

September in Kahaluu-Keauhou continues the trend of substantial rainfall characteristic of the summer months, with 318 mm (12.5 inches) of precipitation recorded across 28 days. This marks a notable decrease from the record-high rainfall of July and August, yet still emphasizes the region's lush, tropical climate. As the island transitions into autumn, the rainfall in September offers a vital replenishment to local ecosystems while providing a vibrant backdrop for the stunning landscapes. Overall, the monthly precipitation amounts highlight a clear pattern: Kahaluu-Keauhou experiences its heaviest rains during the summer, followed by a gradual tapering off as the year progresses.

September Precipitation Trends in Kahaluu-Keauhou

The chart displays monthly precipitation patterns in Kahaluu-Keauhou, 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.
JanFebMarAprMayJunJulAugSepOctNovDec136158174206316377514508318302183198
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kahaluu-Keauhou

September in Kahaluu-Keauhou experiences a notable humidity level of 82%, contributing to the overall tropical ambiance of the region. This month is characterized by a slight decrease from the peak of 84% humidity observed in August, indicating a gradual transition into the fall season. Over the year, humidity levels generally trend upward from January's 79% and peak in August, before fluctuating slightly in the subsequent months. The consistent humidity, especially during the summer months of June through August, weaves a rich tapestry of warmth and moisture, making September a continuation of Kahaluu-Keauhou's lush and vibrant climate.

September Average Humidity in Kahaluu-Keauhou

This chart illustrates the average monthly humidity levels in Kahaluu-Keauhou, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%77%80%80%82%83%84%82%83%83%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kahaluu-Keauhou

As summer transitions to autumn in Kahaluu-Keauhou, the UV Index remains remarkably high in September, registering at 13, which falls into the extreme exposure category. This trend follows a summer peak of 14 in both July and August, underscoring a consistent pattern of elevated UV levels throughout the warm months. Residents and visitors alike should be mindful that the burn time in September is just 10 minutes, mirroring the intense exposure experienced in the preceding months. As we move into October, the UV Index will gradually decrease but still stay significant at 12. For those seeking more detailed information on UV trends, check out the Kahaluu-Keauhou UV Index for essential insights.

Maximum UV Index Levels in Kahaluu-Keauhou for September

The chart shows the monthly maximum UV Index (UVI) for Kahaluu-Keauhou 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.
JanFebMarAprMayJunJulAugSepOctNovDec811121313131414131298
Data source: Kahaluu-Keauhou 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.

September Sunshine in Kahaluu-Keauhou

As summer gracefully hands over the reins to autumn, September in Kahaluu-Keauhou shines brightly with approximately 311 hours of sunshine. This delightful month sees a slight dip from the peak of 338 hours in July, yet it remains comfortably above the lower winter months. The trend of increasing daylight from January's 223 hours to the high of 331 hours in May and June is clearly evident, with September continuing this sunny legacy. The gradual taper towards October's 297 hours hints at the transition into fall but keeps the warm, vibrant energy alive as the community enjoys outdoor activities under the golden rays. It's the perfect time to soak up the last remnants of summer before the daylight begins to wane.

Monthly Sunshine Duration in Kahaluu-Keauhou: September Highlighted

The September sunshine duration represents the total number of hours Kahaluu-Keauhou experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec223h255h282h303h331h331h338h328h311h297h271h262h
Data source: Kahaluu-Keauhou September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kahaluu-Keauhou During September

As we step into September in Kahaluu-Keauhou, the likelihood of sunny weather presents an interesting trend among the months of the year. With a 32% chance of sunshine, September offers a modest chance for clear skies, slightly higher than the late summer months of July and August, which linger around the 25% to 27% mark. This uptick reflects a gradual return to better weather conditions as the year transitions into fall. Overall, while September may not boast the highest chances of sun, it still provides a delightful opportunity to enjoy pleasant weather before the rainy season settles in.

Percentage of Sunny Days in September in Kahaluu-Keauhou

The chart illustrates the percentage of sunny days in Kahaluu-Keauhou throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Kahaluu-Keauhou experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec35%49%39%39%33%31%25%27%32%33%36%28%
Data source: Kahaluu-Keauhou September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kahaluu-Keauhou in September

As summer transitions into fall in Kahaluu-Keauhou, September greets residents with 12 hours of daylight, mirroring the previous month of August. This period marks a gentle shift; after peaking at 13 hours during the height of summer in June and July, daylight begins its gradual retreat. The daylight duration remains consistent through July and starts to taper off in October to 11 hours, heralding the approach of autumn. This rhythmic change captures the essence of island life, where the sun's embrace varies subtly with the seasons, inviting both locals and visitors to enjoy the lingering warmth of summer just a little longer.

Average Daylight Hours in Kahaluu-Keauhou for September

The chart illustrates the variation in daylight duration in Kahaluu-Keauhou throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 5m11h 30m12h 2m12h 35m13h 3m13h 16m13h 9m12h 44m12h 12m11h 39m11h 11m10h 57m
Data source: Kahaluu-Keauhou daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kahaluu-Keauhou

In September, Kahaluu-Keauhou experiences a gentle breeze with an average wind speed of 2.9 m/s (6 mph), mirroring the comfortable conditions of the previous month. This slight dip from the peak summer winds indicates a transition as the region approaches fall. Throughout the summer months, wind speeds gradually increased, peaking in July at 3.4 m/s (8 mph), before showing a subtle decline in August and September. Interestingly, the overall trend reveals a seasonal pattern, where the winds tend to pick up during the warmer summer months and ease into the cooler fall season. This rhythm of the winds contributes to the area's refreshing coastal atmosphere, making September a delightful time for outdoor activities in Kahaluu-Keauhou.

Average September Wind Speed in Kahaluu-Keauhou

The chart displays monthly wind speed patterns in Kahaluu-Keauhou, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.52.42.52.42.93.13.43.02.9 m/s3.02.42.6
Data source: Kahaluu-Keauhou September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kahaluu-Keauhou Compares to Other Months

The weather in Kahaluu-Keauhou changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Kahaluu-Keauhou and find detailed weather information for every month.

In September, the weather is warmer with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F), while January sees slightly cooler conditions with average temperatures between 17°C (63°F) and 24°C (75°F). September experiences significantly higher precipitation, with 318 mm (12.5 in) over 28 days, compared to January's 135 mm (5.3 in) across 20 days. Despite both months having high humidity, September's humidity averages around 82%, slightly higher than January's 79%. For a detailed look at what to expect weather-wise in January, check out Kahaluu-Keauhou weather in January.

In comparison to September, February experiences generally milder temperatures, with minimums of 15°C (60°F) compared to September's 20°C (68°F). The average temperature in February is also lower at 20°C (68°F), while September sees an average of 23°C (73°F). Furthermore, February has less precipitation, with 158 mm (6.2 in) over 20 days, compared to September's significant 318 mm (12.5 in) spread across 28 days. Humidity levels are slightly lower in February at 79% versus September's 82%, contributing to a more comfortable atmosphere. For more detailed insights, check out Kahaluu-Keauhou weather in February.

When comparing the weather in September and March, September tends to be warmer, with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F), while March sees slightly cooler temperatures, averaging from 16°C (62°F) to 24°C (76°F). Additionally, September experiences significantly higher precipitation, accumulating 318 mm (12.5 in) over 28 days, compared to March's 174 mm (6.8 in) over 27 days. The humidity is also higher in September at 82% versus 77% in March. For more detailed weather insights, you can check Kahaluu-Keauhou weather in March.

When comparing the weather in September and April, September tends to be warmer, with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F), as opposed to April's slightly cooler range of 17°C (63°F) to 24°C (76°F). Additionally, September experiences significantly more precipitation, totaling 318 mm (12.5 in) over 28 days, compared to April's 206 mm (8.1 in) across 26 days. Humidity levels are quite similar, with September at 82% and April at 80%. For more detailed information on April weather specifically, you can check Kahaluu-Keauhou weather in April.

In comparing the weather between September and May, both months showcase relatively warm temperatures, with September being slightly warmer on average, ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F), while May sees temperatures from 18°C (64°F) to 24°C (76°F). Precipitation is quite similar, with September receiving 318 mm (12.5 in) over 28 days and May having 316 mm (12.4 in) over 29 days, indicating consistent rainfall in both months. Humidity is also comparable, with September at 82% and May at 80%, creating a subtropical feel throughout both periods. For more detailed information about the weather in May, you can check Kahaluu-Keauhou weather in May.

When comparing the weather in September and June, we find that September generally has slightly warmer temperatures, with a minimum of 20°C (68°F) and an average of 23°C (73°F), compared to June's minimum of 19°C (66°F) and average of 22°C (72°F). However, June tends to have more rainfall, amounting to 377 mm (14.8 in) over 29 days, while September sees 318 mm (12.5 in) over 28 days. Interestingly, both months share the same humidity level of 82%. For more details about June weather, you can check Kahaluu-Keauhou weather in June.

When comparing the weather in September and July, both months exhibit relatively warm temperatures; September has a minimum of 20°C (68°F) and a maximum of 27°C (81°F), while July features slightly lower temperatures, with a minimum of 19°C (67°F) and a maximum of 26°C (79°F). However, September experiences less precipitation, totaling 318 mm (12.5 in) over 28 days, compared to July's 514 mm (20.2 in) over 31 days. Humidity levels remain similar, with September at 82% and July at 83%. Overall, September tends to be a drier month with slightly warmer highs in comparison to the wetter conditions and slightly cooler temperatures of July. For a more detailed look at July weather, check out Kahaluu-Keauhou weather in July.

In comparing the weather conditions of September to those of August, both months exhibit similar temperature ranges, with September experiencing a minimum of 20°C (68°F), an average of 23°C (73°F), and a maximum of 27°C (81°F), slightly warmer than August’s maximum of 26°C (80°F). However, September sees a notable reduction in precipitation, with 318 mm (12.5 in) over 28 days compared to August’s higher total of 508 mm (20.0 in) across all 31 days, suggesting a drier climate entering the fall. Humidity levels are also slightly lower in September at 82%, compared to 84% in August. For more details on August weather, you can visit Kahaluu-Keauhou weather in August.

In comparing the weather between September and October, we see that both months maintain a similar average temperature of around 23°C (73°F), with September experiencing slightly warmer max temperatures at 27°C (81°F) compared to October's 26°C (79°F). While September sees a total precipitation of 318 mm (12.5 in) across 28 days, October records slightly less, with 302 mm (11.9 in) of rain over the same number of days. Humidity levels remain comparable, with September at 82% and October slightly higher at 83%. For more detailed insights specifically related to Kahaluu-Keauhou, you can check the Kahaluu-Keauhou weather in October.

In comparing the weather of September and November, September generally feels warmer with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F) and an average of 23°C (73°F). In contrast, November's temperatures are slightly cooler, with a minimum of 18°C (65°F), an average of 22°C (72°F), and a maximum of 25°C (78°F). Additionally, September experiences significantly higher precipitation with 318 mm (12.5 in) over 28 days, whereas November sees reduced rainfall at 183 mm (7.2 in) across 23 days. The humidity remains consistently high in both months, with September at 82% and November slightly higher at 83%. For a detailed breakdown of the climate during this month, you can check out the Kahaluu-Keauhou weather in November.

In September, the weather tends to be warmer, with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 27°C (81°F) and an average of 23°C (73°F). It is also notably wetter, receiving 318 mm (12.5 in) of precipitation over 28 days, with humidity levels at a high 82%. In contrast, December features slightly cooler temperatures, with a minimum of 17°C (63°F), an average of 21°C (70°F), and a maximum of 26°C (79°F). The month is drier, with only 198 mm (7.8 in) of rainfall over 24 days and a slightly lower humidity of 81%. For a more detailed look at the December weather in Kahaluu-Keauhou, you can refer to this link: Kahaluu-Keauhou weather in December.

Compare Kahaluu-Keauhou's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kahaluu-Keauhou

September in Kahaluu-Keauhou is characterized by a warm and humid climate, with temperatures typically feeling more tropical compared to other months. The average warmth creates a pleasant atmosphere for visitors, even as precipitation peaks, with frequent rain showers contributing to lush landscapes. This month stands out with its significant rainfall and higher humidity, offering a distinct contrast to the drier and cooler conditions seen earlier in the year. Whether exploring the vibrant flora or enjoying the warm ocean, September’s unique weather sets the stage for an unforgettable experience in paradise. For more insights into the weather throughout the year, visit Kahaluu-Keauhou Climate.