Kailua, Big Island weather in September 2026

Expect daytime maximum temperatures of 23°C in Kailua, Big Island, Hawaii in September based on long-term weather averages. There are 15 days with some rainfall and typically 54 mm of rainfall in the month.

• 23
  23°C max day temperature
• 15
  15 days with some rainfall
• 15
  15°C min night temperature
• 12
  12 hours of daylight per day
• M
  Moderate heat & humidity
• 54
  54 mm of monthly rainfall
• 11
  11+ (Extreme) UV index
• 27
  27°C sea temperature

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The September weather guide for Hawaii (Kailua, Big Island) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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Kailua, Big Island September sunrise & sunset times

Browse the sunrise and sunset times for Kailua, Big Island in September 2026. Select a month to view Kailua, Big Island sunrise and sunset times for the next 12 months.

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