September Weather in Kealakekua, United States

Last updated: February 24, 2025

In Kealakekua, United States, the weather in September is characterized by warm temperatures, with a maximum reaching 27°C (81°F) and an average of 23°C (73°F). Expect mild nights as temperatures dip to a minimum of 20°C (68°F). However, this month is notably wet, with a substantial precipitation total of 318 mm (12.5 in) spread over 28 days, resulting in a humid environment with an average humidity level of 82%. Visitors and residents alike should prepare for frequent rains, but they are rewarded with lush landscapes and vibrant nature.

September Temperature in Kealakekua

As summer transitions into fall, September in Kealakekua showcases a delightful blend of warmth and comfort. With minimum temperatures averaging 20°C (68°F) and highs reaching a pleasant 27°C (81°F), the month exhibits a subtle rise in warmth compared to August. This slight increase in both temperature and a consistent average of 23°C (73°F) offers an inviting atmosphere for outdoor activities and exploring the stunning landscapes. The overall trend reflects a gradual warming as the year progresses, making September an ideal time for locals and visitors alike to bask in the tropical sunshine before the cooler months set in.

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

The chart illustrates September temperature patterns in Kealakekua, 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 Kealakekua 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 Kealakekua

In September, Kealakekua experiences a significant amount of rainfall, with 318 mm (12.5 in) recorded, marking it as one of the wetter months of the year. This month sees 28 days of precipitation, contributing to the lush, vibrant landscape that the region is renowned for. Although September's rainfall is notably lower than the peak months of July and August, which exceed 500 mm, it still aligns with the overall trend of increasing precipitation during the summer. As the year heads into the cooler months of October and November, the rainfall begins to taper off, dropping from September's high but remaining substantial at 302 mm (11.9 in) in October. This pattern underscores the importance of September in the seasonal cycle, as it bridges the gap between the intense summer rains and the gradually diminishing precipitation in the fall.

September Precipitation Trends in Kealakekua

The chart displays monthly precipitation patterns in Kealakekua, 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 Kealakekua

September in Kealakekua, United States, showcases a comforting humidity level of 82%, continuing the trend of elevated moisture that peaks during the summer months. The transition from August, which typically records the highest humidity at 84%, to September indicates a slight dip but remains consistent with the generally high humidity throughout the year. As autumn approaches, humidity levels gradually stabilize, with October and November hovering around 83%. This pattern highlights Kealakekua's unique tropical climate, where even as the seasons shift, the air retains a notably humid character, creating a lush environment year-round.

September Average Humidity in Kealakekua

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

In September, Kealakekua continues to experience intense sunlight, maintaining a UV Index of 13, which falls into the extreme exposure category. This level means that even a brief 10-minute period of unprotected exposure can lead to sunburn, a trend typical for this time of year as the island basks in prolonged summer rays. The UV Index gradually declines from its July and August peak of 14, but remains notably high compared to the earlier months of the year. As the seasons transition, it’s crucial for residents and visitors alike to stay vigilant and protect their skin. For continuous updates and safety tips, check out the Kealakekua UV Index.

Maximum UV Index Levels in Kealakekua for September

The chart shows the monthly maximum UV Index (UVI) for Kealakekua 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: Kealakekua 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 Kealakekua

As summer gracefully gives way to autumn, September in Kealakekua shines brightly with an impressive 311 hours of sunlight, marking a gentle decline from the peak brilliance of July and August. This trend reflects a slow yet steady transition, where the sun remains a constant companion, bathing the landscape in warmth and light for the majority of the month. Interestingly, the sun-soaked days of May and June set a high standard, but September maintains its allure, promising plenty of golden moments before the cooler months approach. Just as nature begins to change, so too does the rhythm of sunshine, inviting residents and visitors alike to revel in the lingering brightness.

Monthly Sunshine Duration in Kealakekua: September Highlighted

The September sunshine duration represents the total number of hours Kealakekua 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: Kealakekua September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kealakekua During September

As summer fades and autumn approaches, the likelihood of sunny weather in Kealakekua, United States, shows a subtle decline in September, resting at 32%. This figure reflects a slight dip from the peak brightness of earlier months, contributing to a trend where the chances of sunshine steadily decrease from the arid summer, reaching their lowest point in July at 25%. Although September isn't the sunniest month, it still offers a fair chance of clear skies compared to the post-summer months; October, for example, sees only a marginal increase to 33%. So, while you might not bask in relentless sunshine, there's still room to embrace the warmth of the Hawaiian sun amid the transitioning seasons.

Percentage of Sunny Days in September in Kealakekua

The chart illustrates the percentage of sunny days in Kealakekua 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 Kealakekua experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec35%49%39%39%33%31%25%27%32%33%36%28%
Data source: Kealakekua September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kealakekua in September

In Kealakekua, September marks a transition towards shorter days as the daylight duration settles at 12 hours. This month reflects a slight decrease from the peak of 13 hours enjoyed during the summer months of June through August. Following the gradual increase in daylight through spring and early summer, September stands as a reminder of the impending autumn, with daylight slowly tapering off towards October's 11-hour days. This rhythmic ebb and flow of daylight not only shapes the natural beauty of Kealakekua but also enhances the vibrant experiences associated with each changing season.

Average Daylight Hours in Kealakekua for September

The chart illustrates the variation in daylight duration in Kealakekua 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: Kealakekua daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kealakekua

In Kealakekua, United States, September brings a gentle yet noticeable shift in wind patterns, with an average wind speed of 2.9 m/s (6 mph). As summer fades, this month experiences a slight dip in winds compared to the summer peak in July, which recorded 3.4 m/s (8 mph). However, September's winds remain consistent with the breezy conditions of May and June, suggesting a stable transition towards autumn. Overall, the gentle winds of September contribute to a serene atmosphere, perfect for enjoying the stunning coastal landscapes and vibrant sunsets that characterize this beautiful time of year.

Average September Wind Speed in Kealakekua

The chart displays monthly wind speed patterns in Kealakekua, 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: Kealakekua September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kealakekua Compares to Other Months

The weather in Kealakekua 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 Kealakekua and find detailed weather information for every month.

The weather in September features warmer temperatures, with a minimum of 20°C (68°F) and an average of 23°C (73°F), while January experiences slightly cooler conditions, with a minimum of 17°C (63°F) and an average of 20°C (69°F). September is marked by higher precipitation levels at 318 mm (12.5 in) spread over 28 days, compared to January's more moderate 135 mm (5.3 in) over 20 days. Humidity levels are quite similar, with September at 82% and January slightly lower at 79%. For more detailed information, consider exploring Kealakekua weather in January.

In comparing the weather of September and February, September generally experiences warmer temperatures, with a minimum of 20°C (68°F) and an average high of 27°C (81°F), while February's temperatures are slightly cooler, ranging from a minimum of 15°C (60°F) to a maximum of 24°C (76°F). Additionally, September has significantly more rainfall, totaling 318 mm (12.5 in) over 28 days, compared to February's 158 mm (6.2 in) over 20 days. Humidity levels are also comparable, with September at 82% and February slightly lower at 79%. For more detailed insights on February weather, you can visit Kealakekua weather in February.

When comparing the weather in September and March, September tends to be warmer and more humid. With average temperatures ranging from 20°C (68°F) to a maximum of 27°C (81°F), it boasts a higher overall warmth than March, which has a milder temperature range of 16°C (62°F) to 24°C (76°F). Additionally, September experiences significantly more rainfall, totaling 318 mm (12.5 in) over 28 days, compared to March's 174 mm (6.8 in) over 27 days. Consequently, September's humidity is also higher at 82%, compared to March's 77%. For more specific details on March weather, you can visit Kealakekua weather in March.

In comparing the weather between 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), while April features slightly cooler temperatures, with averages from 17°C (63°F) to 24°C (76°F). Additionally, September experiences a higher amount of precipitation at 318 mm (12.5 in) over 28 days, compared to April's 206 mm (8.1 in) over 26 days. The humidity levels are relatively similar, with September at 82% and April at 80%. For more detailed insights on the weather during April, you can visit Kealakekua weather in April.

In comparing the weather of September and May, both months exhibit similar temperature ranges, with September having slightly higher averages, with a minimum temperature of 20°C (68°F) and a maximum of 27°C (81°F), compared to May's 18°C (64°F) minimum and 24°C (76°F) maximum. Precipitation levels are nearly identical, with September accumulating 318 mm (12.5 in) over 28 days and May recording 316 mm (12.4 in) across 29 days. Humidity levels are slightly higher in September at 82% compared to May's 80%. For a closer look at weather conditions during May, you can explore Kealakekua weather in May.

In comparing the weather between June and September, both months exhibit similar humidity levels at 82%. However, September tends to be slightly warmer with average temperatures ranging from 20°C (68°F) to 27°C (81°F), compared to June's range of 19°C (66°F) to 25°C (77°F). Precipitation is notable in both months, with September receiving 318 mm and June slightly higher at 377 mm, albeit over just one more day of rain. To explore more about June's conditions, you can check out Kealakekua weather in June.

When comparing the weather in September to that of July, we can observe some notable differences. September sees slightly warmer temperatures with a minimum of 20°C (68°F) and a maximum of 27°C (81°F), while July has a minimum of 19°C (67°F) and a max of 26°C (79°F). Interestingly, both months have the same average temperature of 23°C (73°F). However, July experiences significantly more precipitation, with 514 mm (20.2 in) over 31 days compared to September's 318 mm (12.5 in) across 28 days. This results in only a marginally higher humidity in July, which stands at 83% compared to September's 82%. For more detailed information, you can refer to Kealakekua weather in July.

In comparing the weather of August and September, both months experience a similar range of temperatures, with September averaging between 20°C (68°F) and 27°C (81°F), slightly warmer than August's maximum of 26°C (80°F). However, September sees a significant drop in precipitation, totaling 318 mm (12.5 in) across 28 days, while August is much wetter, with 508 mm (20.0 in) of rainfall over 31 days. Humidity levels remain fairly comparable, with September at 82% and August at 84%. For more information on August weather specifics, you can check Kealakekua weather in August.

In September, the weather is characterized by a slightly warmer atmosphere with minimum temperatures around 20°C (68°F) and maximum levels reaching 27°C (81°F). The month sees significant precipitation, totaling 318 mm (12.5 in) over 28 days, and humidity levels remain quite high at 82%. In contrast, October experiences slightly cooler temperatures, with a minimum of 19°C (67°F) and a maximum of 26°C (79°F), while still maintaining an average of 23°C (73°F). The precipitation decreases slightly to 302 mm (11.9 in) over the same number of days, but humidity rises marginally to 83%. For a detailed view of October's climate, you can check Kealakekua weather in October.

September generally experiences warmer temperatures compared to November, with an average of 23°C (73°F) and peak highs reaching 27°C (81°F), while November sees slightly cooler temperatures with an average of 22°C (72°F) and maximums of 25°C (78°F). In terms of precipitation, September is notably wetter, receiving 318 mm (12.5 in) over 28 days, whereas November has 183 mm (7.2 in) spread across 23 days. Despite the drop in rainfall, humidity levels remain quite similar, with September at 82% and November slightly higher at 83%. For a closer look at the specific conditions during this time, check out Kealakekua weather in November.

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 December presents slightly cooler temperatures, peaking at 26°C (79°F). Although September is hotter, it also brings more rainfall, with 318 mm (12.5 in) of precipitation over 28 days, compared to December's 198 mm (7.8 in) over 24 days. Humidity levels remain relatively consistent, with September at 82% and December at 81%. For more details on the weather in December, you can check out Kealakekua weather in December.

Compare Kealakekua's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kealakekua

In September, Kealakekua experiences a unique blend of warmth and rain, setting it apart from other months. With daily temperatures averaging around a comfortable 23°C, the days invite outdoor exploration, though frequent rainfall—spanning nearly the entire month—adds a refreshing twist to the tropical climate. The high humidity enhances the lush greenery of the region, making it a picturesque time to witness the vibrant landscapes. For those planning a visit, understanding this distinct weather pattern is essential; find more details about the climate of Kealakekua at Kealakekua Climate.