Sydney weather in September 2025

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

  • 20°C maximum daytime temperature in September in Sydney20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Sydney10
    10 days with some rainfall
  • 11°C minimum night-time temperature in September in Sydney11
    11°C min night temperature
  • 12 hours of daylight per day in September in Sydney12
    12 hours of daylight per day
  • No heat & humidity in September in Sydney0
    No heat & humidity
  • 62 mm monthly rainfall in September in Sydney62
    62 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Sydney5
    5 (Moderate) UV index
  • 18°C sea temperature in September in Sydney18
    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.

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

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More about Australia

How hot is it in Sydney in September?

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

How sunny is it in Sydney in September?

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

How warm is the sea around Sydney in September?

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

Does it rain in Sydney in September?

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

Sydney September sunrise & sunset times

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

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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