Kailua, Big Island weather in September 2026

Expect daytime maximum temperatures of 73°F in Kailua, Big Island, Hawaii in September based on long-term weather averages. There are 15 days with some rainfall and typically 2.1 inches of rainfall in the month.

  • 73°F maximum daytime temperature in September in Kailua, Big Island73
    73°F max day temperature
  • 15 days with some rainfall in September in Kailua, Big Island15
    15 days with some rainfall
  • 59°F minimum night-time temperature in September in Kailua, Big Island59
    59°F min night temperature
  • 12 hours of daylight per day in September in Kailua, Big Island12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Kailua, Big IslandM
    Moderate heat & humidity
  • 2.1 inches monthly rainfall in September in Kailua, Big Island2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Kailua, Big Island11
    11+ (Extreme) UV index
  • 81°F sea temperature in September in Kailua, Big Island81
    81°F 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)  |  Imperial (°F)

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How hot is it in Kailua, Big Island in September?

Daytime temperatures usually reach 86°F in Kailua, Big Island in September with high heat and humidity, falling to 72°F at night.

How sunny is it in Kailua, Big Island in September?

There are normally 9 hours of bright sunshine each day in Kailua, Big Island in September - that's 74% of daylight hours.

How warm is the sea around Kailua, Big Island in September?

The average sea temperature around Kailua, Big Island in September is 81°F.

Does it rain in Kailua, Big Island in September?

There are usually 8 days with some rain in Kailua, Big Island in September and the average monthly rainfall is 0.7 inches.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:09 18:39
Tuesday, 15th September 2026 06:11 18:26
Wednesday, 30th September 2026 06:15 18:13

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