Australia weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Australia in September. Check more long-term weather averages for Australia in September before you book your next holiday to Australia in 2025/2026.

  • 20°C maximum daytime temperature in September in Australia (Sydney)20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Australia (Sydney)10
    10 days with some rainfall
  • 11°C minimum night-time temperature in September in Australia (Sydney)11
    11°C min night temperature
  • 12 hours of daylight per day in September in Australia (Sydney)12
    12 hours of daylight per day
  • No heat & humidity in September in Australia (Sydney)0
    No heat & humidity
  • 62 mm monthly rainfall in September in Australia (Sydney)62
    62 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Australia (Sydney)5
    5 (Moderate) UV index
  • 18°C sea temperature in September in Australia (Sydney)18
    18°C sea temperature

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The September weather guide for Australia (Sydney) 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 Australia destinations

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

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

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More about Australia

How hot is it in Australia in September?

Daytime temperatures usually reach 20°C in Sydney, Australia in September, falling to 11°C at night.

How sunny is it in Australia in September?

There are normally 7 hours of bright sunshine each day in Sydney, Australia in September - that's 62% of daylight hours.

How warm is the sea around Australia in September?

The average sea temperature around Sydney, Australia in September is 18°C.

Does it rain in Australia in September?

There are usually 10 days with some rain in Sydney, Australia in September and the average monthly rainfall is 62mm.

Australia September sunrise & sunset times

Browse the sunrise and sunset times for Australia in September 2025. Select a month to view Australia sunrise and sunset times for the next 12 months. The Australia sunrise and sunset times shown below are for Sydney.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:14 17:37
Monday, 15th September 2025 05:55 17:47
Tuesday, 30th September 2025 05:34 17:57

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