West Island weather in September 2025

Expect daytime maximum temperatures of 28°C in West Island in September based on long-term weather averages. There are 14 days with some rainfall and typically 105 mm of rainfall in the month.

  • 28°C maximum daytime temperature in September in West Island28
    28°C max day temperature
  • 14 days with some rainfall in September in West Island14
    14 days with some rainfall
  • 23°C minimum night-time temperature in September in West Island23
    23°C min night temperature
  • 12 hours of daylight per day in September in West Island12
    12 hours of daylight per day
  • Moderate heat & humidity in September in West IslandM
    Moderate heat & humidity
  • 105 mm monthly rainfall in September in West Island105
    105 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in West Island11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in West Island26
    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 West Island in September?

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

How warm is the sea around West Island in September?

The average sea temperature around West Island in September is 26°C.

Does it rain in West Island in September?

There are usually 14 days with some rain in West Island in September and the average monthly rainfall is 105mm.

West Island September sunrise & sunset times

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

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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