Chatham Island weather in September 2025

Expect 11°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Chatham Island in September based on long-term weather averages. There is usually 3 days with some rainfall and 72 mm of average monthly rainfall in September.

  • 11°C maximum daytime temperature in September in Chatham Island11
    11°C max day temperature
  • 4 hours of sunshine per day
  • 3 days with some rainfall in September in Chatham Island3
    3 days with some rainfall
  • 6°C minimum night-time temperature in September in Chatham Island6
    6°C min night temperature
  • 12 hours of daylight per day in September in Chatham Island12
    12 hours of daylight per day
  • No heat & humidity in September in Chatham Island0
    No heat & humidity
  • 72 mm monthly rainfall in September in Chatham Island72
    72 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Chatham Island3
    3 (Moderate) UV index
  • 11°C sea temperature in September in Chatham Island11
    11°C sea temperature

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The September weather guide for New Zealand (Chatham 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 warm is it in Chatham Island in September?

Daytime temperatures usually reach 11°C in Chatham Island in September, falling to 6°C at night.

How sunny is it in Chatham Island in September?

There are normally 4 hours of bright sunshine each day in Chatham Island in September - that's 30% of daylight hours.

Is the sea cold around Chatham Island in September?

The average sea temperature around Chatham Island in September is 11°C.

Does it ever rain in Chatham Island in September?

There are usually 3 days with some rain in Chatham Island in September and the average monthly rainfall is 72mm.

Chatham Island September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:59 18:04
Monday, 15th September 2025 06:34 18:20
Tuesday, 30th September 2025 06:06 18:37

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