Hawaii weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Hawaii in September. Check more long-term weather averages for Hawaii in September before you book your next holiday to Hawaii in 2025/2026.

  • 30°C maximum daytime temperature in September in Hawaii (Honolulu, Oahu)30
    30°C max day temperature
  • 9 hours of sunshine per day
  • 8 days with some rainfall in September in Hawaii (Honolulu, Oahu)8
    8 days with some rainfall
  • 22°C minimum night-time temperature in September in Hawaii (Honolulu, Oahu)22
    22°C min night temperature
  • 12 hours of daylight per day in September in Hawaii (Honolulu, Oahu)12
    12 hours of daylight per day
  • High heat & humidity in September in Hawaii (Honolulu, Oahu)H
    High heat & humidity
  • 18 mm monthly rainfall in September in Hawaii (Honolulu, Oahu)18
    18 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Hawaii (Honolulu, Oahu)11
    11 (Extreme) UV index
  • 27°C sea temperature in September in Hawaii (Honolulu, Oahu)27
    27°C sea temperature

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The September weather guide for Hawaii (Honolulu, Oahu) 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.

Top Hawaii destinations

Below are average maximum temperatures at popular countries, regions and places in Hawaii in September. Select a holiday destination to see more weather parameters.

All Hawaii destinations

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

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How hot is it in Hawaii in September?

Daytime temperatures usually reach 30°C in Honolulu, Oahu, Hawaii in September with high heat and humidity, falling to 22°C at night.

How sunny is it in Hawaii in September?

There are normally 9 hours of bright sunshine each day in Honolulu, Oahu, Hawaii in September - that's 74% of daylight hours.

How warm is the sea around Hawaii in September?

The average sea temperature around Honolulu, Oahu, Hawaii in September is 27°C.

Does it rain in Hawaii in September?

There are usually 8 days with some rain in Honolulu, Oahu, Hawaii in September and the average monthly rainfall is 18mm.

Hawaii September sunrise & sunset times

Browse the sunrise and sunset times for Hawaii in September 2025. Select a month to view Hawaii sunrise and sunset times for the next 12 months. The Hawaii sunrise and sunset times shown below are for Honolulu, Oahu.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:15 18:47
Monday, 15th September 2025 06:19 18:34
Tuesday, 30th September 2025 06:22 18:20

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