Cocos (Keeling) Islands weather in September 2025

Expect 28°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Cocos (Keeling) Islands in September. Check more long-term weather averages for Cocos (Keeling) Islands in September before you book your next holiday to Cocos (Keeling) Islands in 2025/2026.

  • 28°C maximum daytime temperature in September in Cocos (Keeling) Islands (West Island)28
    28°C max day temperature
  • 14 days with some rainfall in September in Cocos (Keeling) Islands (West Island)14
    14 days with some rainfall
  • 23°C minimum night-time temperature in September in Cocos (Keeling) Islands (West Island)23
    23°C min night temperature
  • 12 hours of daylight per day in September in Cocos (Keeling) Islands (West Island)12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Cocos (Keeling) Islands (West Island)M
    Moderate heat & humidity
  • 105 mm monthly rainfall in September in Cocos (Keeling) Islands (West Island)105
    105 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Cocos (Keeling) Islands (West Island)11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Cocos (Keeling) Islands (West Island)26
    26°C sea temperature

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The September weather guide for Cocos (Keeling) Islands, represented by West Island, (West 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 Cocos (Keeling) Islands in September?

Daytime temperatures usually reach 28°C in West Island, Cocos (Keeling) Islands in September with moderate heat and humidity, falling to 23°C at night.

How warm is the sea around Cocos (Keeling) Islands in September?

The average sea temperature around West Island, Cocos (Keeling) Islands in September is 26°C.

Does it rain in Cocos (Keeling) Islands in September?

There are usually 14 days with some rain in West Island, Cocos (Keeling) Islands in September and the average monthly rainfall is 105mm.

Cocos (Keeling) Islands September sunrise & sunset times

Browse the sunrise and sunset times for Cocos (Keeling) Islands in September 2025. Select a month to view Cocos (Keeling) Islands sunrise and sunset times for the next 12 months. The Cocos (Keeling) Islands sunrise and sunset times shown below are for West Island.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:06 17:59
Monday, 15th September 2025 05:57 17:59
Tuesday, 30th September 2025 05:47 17:59

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