September weather forecast and climate
Kailua-Kona, HI

A panoramic shot of Kailua-Kona, Hawaii, surrounded by clear waters, and a view of the mountain slope
A panoramic shot of Kailua-Kona, Hawaii, surrounded by clear waters, and a view of the mountain slope

What is the average temperature in September in Kailua-Kona?

The average high-temperature, in September, is 86.7°F (30.4°C), while the average low-temperature is 74.7°F (23.7°C).
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 lowest 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: 12.2h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

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