Mitiaro weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Mitiaro in September. Check more long-term weather averages for Mitiaro in September before you book your next holiday to Cook Islands in 2025/2026.

  • 27°C maximum daytime temperature in September in Mitiaro27
    27°C max day temperature
  • 5 days with some rainfall in September in Mitiaro5
    5 days with some rainfall
  • 21°C minimum night-time temperature in September in Mitiaro21
    21°C min night temperature
  • 12 hours of daylight per day in September in Mitiaro12
    12 hours of daylight per day
  • Moderate heat & humidity in September in MitiaroM
    Moderate heat & humidity
  • 78 mm monthly rainfall in September in Mitiaro78
    78 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in September in Mitiaro10
    10 (Very High) UV index
  • 25°C sea temperature in September in Mitiaro25
    25°C sea temperature

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The September weather guide for Cook Islands (Mitiaro) 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 Mitiaro in September?

Daytime temperatures usually reach 27°C in Mitiaro in September with moderate heat and humidity, falling to 21°C at night.

How warm is the sea around Mitiaro in September?

The average sea temperature around Mitiaro in September is 25°C.

Does it rain in Mitiaro in September?

There are usually 5 days with some rain in Mitiaro in September and the average monthly rainfall is 78mm.

Mitiaro September sunrise & sunset times

Browse the sunrise and sunset times for Mitiaro in September 2025. Select a month to view Mitiaro sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:39 18:23
Monday, 15th September 2025 06:26 18:26
Tuesday, 30th September 2025 06:13 18:29

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