Hilo, Big Island weather in September 2025

Expect 75°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Hilo, Big Island in September. Check more long-term weather averages for Hilo, Big Island in September before you book your next holiday to Hawaii in 2025/2026.

  • 75°F maximum daytime temperature in September in Hilo, Big Island75
    75°F 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
  • 61°F minimum night-time temperature in September in Hilo, Big Island61
    61°F 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
  • 9.9 inches monthly rainfall in September in Hilo, Big Island9.9
    9.9 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Hilo, Big Island11
    11+ (Extreme) UV index
  • 81°F sea temperature in September in Hilo, Big Island81
    81°F 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)  |  Imperial (°F)

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More about the USA

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

Daytime temperatures usually reach 75°F in Hilo, Big Island in September, falling to 61°F 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 81°F.

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 9.9 inches.

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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