New South Wales weather in September 2025

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

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

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The September weather guide for New South Wales (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 New South Wales destinations

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

All New South Wales destinations

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

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More about Australia

How hot is it in New South Wales in September?

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

How sunny is it in New South Wales in September?

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

How warm is the sea around New South Wales in September?

The average sea temperature around Sydney, New South Wales in September is 18°C.

Does it rain in New South Wales in September?

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

New South Wales September sunrise & sunset times

Browse the sunrise and sunset times for New South Wales in September 2025. Select a month to view New South Wales sunrise and sunset times for the next 12 months. The New South Wales 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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