Hilo, Big Island weather in September 2025

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

  • 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

More about Hilo, Big Island

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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More about the USA

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

Daytime temperatures usually reach 24°C in Hilo, Big Island in September, falling to 16°C at night.

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

There are normally 5 hours of bright sunshine each day in Hilo, Big Island in September - that's 43% 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 14 days with some rain in Hilo, Big Island in September and the average monthly rainfall is 252mm.

Hilo, Big Island September sunrise & sunset times

Browse the sunrise and sunset times for Hilo, Big Island in September 2025. Select a month to view Hilo, Big Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:05 18:35
Monday, 15th September 2025 06:08 18:22
Tuesday, 30th September 2025 06:11 18:09

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