September weather forecastKailua-Kona, HI

Kailua-Kona, Hawaii, surrounded by clear waters

September

Weather in September

September brings a halt to the hot weather trends, as Kailua-Kona experiences a relief from the summer heat. The city encounters a slight dip in temperatures, with sea temperatures at 80°F (26.7°C). Despite the reduction in temperatures and daylight hours, the dry environment persists with minimal rainfall. All in all, the weather conditions provide the ideal environment for various outdoor activities.

Temperature

September registers an average high-temperature of a still hot 86.7°F (30.4°C), slightly varied from August's 86.9°F (30.5°C). Kailua-Kona observes an average low-temperature of 74.7°F (23.7°C) during September.

Rainfall

During September, Kailua-Kona regularly aggregates up to 0.83" (21mm) of precipitation. During the entire year, Kailua-Kona aggregates up to 18.39" (467mm) of precipitation.

Ocean temperature

September is the month with the warmest seawater in Kailua-Kona, Hawaii, with an average ocean temperature of 80.1°F (26.7°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of September, sunrise is at 6:08 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:12 pm HST.

Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature and low-temperature in Kailua-Kona during September are 86.7°F (30.4°C) and 74.7°F (23.7°C) respectively.

During September, Kailua-Kona regularly aggregates up to 0.83" (21mm) of precipitation.

With an average ocean temperature of 80.1°F (26.7°C), September is the month with the warmest seawater.

In September, the average ocean temperature in Kailua-Kona is 80.1°F (26.7°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

The average day length in September in Kailua-Kona is 12h and 14min.

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 6:38 pm. On the last day of the month, in Kailua-Kona, Hawaii, sunrise is at 6:14 am and sunset at 6:12 pm HST.

Today

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Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

86.9°F

86.8°F

86°F

Average low temperature

Average rainfall

Average sea temperature

Average daylight

Average temperature in September
Kailua-Kona, HI

Average high temperature in September: 86.8°F

The warmest month (with the highest average high temperature) is August (86.9°F).
The month with the lowest average high temperature is February (81.2°F).

Average low temperature in September: 74.6°F

The month with the highest average low temperature is August (75.1°F).
The coldest month (with the lowest average low temperature) is February (68°F).

Average rainfall in September
Kailua-Kona, HI

Average rainfall in September: 0.8"

The wettest month (with the highest rainfall) is December (2.8").
The driest month (with the least rainfall) is July (0.7").

Average sea temperature in September
Kailua-Kona, HI

Average sea temperature in September: 80°F

The best month for swimming (with the highest average sea temperature) is September (80°F).
The coldest month (with the lowest average sea temperature) is March (76°F).

Average daylight in September
Kailua-Kona, HI

Average daylight in September: 12h and 12min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).