Hilo, Big Island weather in September 2026

Expect daytime maximum temperatures of 24°C in Hilo, Big Island, Hawaii in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 14 days with some rainfall and typically 252 mm of rainfall in the month.

  • 24°C maximum daytime temperature in September in Hilo, Big Island24
    24°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in September in Hilo, Big Island14
    14 days with some rainfall
  • 16°C minimum night-time temperature in September in Hilo, Big Island16
    16°C min night temperature
  • 12 hours of daylight per day in September in Hilo, Big Island12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Hilo, Big IslandM
    Moderate heat & humidity
  • 252 mm monthly rainfall in September in Hilo, Big Island252
    252 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Hilo, Big Island11
    11+ (Extreme) UV index
  • 27°C sea temperature in September in Hilo, Big Island27
    27°C sea temperature

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Hilo, Big Island by month

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The September weather guide for Hawaii (Hilo, 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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How hot is it in Hilo, Big Island in September?

Daytime temperatures usually reach 30°C in Hilo, Big Island in September with high heat and humidity, falling to 22°C at night.

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

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

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

The average sea temperature around Hilo, Big Island in September is 27°C.

Does it rain in Hilo, Big Island in September?

There are usually 8 days with some rain in Hilo, Big Island in September and the average monthly rainfall is 18mm.

Hilo, Big Island September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:05 18:35
Tuesday, 15th September 2026 06:08 18:23
Wednesday, 30th September 2026 06:11 18:09

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