Western Australia weather in September 2025

Expect daytime maximum temperatures of 20°C in Western Australia, Australia in September based on long-term weather averages. There are 8 hours of sunshine per day on average with 10 days with some rainfall and typically 71 mm of rainfall in the month.

  • 20°C maximum daytime temperature in September in Western Australia (Perth)20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in September in Western Australia (Perth)10
    10 days with some rainfall
  • 10°C minimum night-time temperature in September in Western Australia (Perth)10
    10°C min night temperature
  • 12 hours of daylight per day in September in Western Australia (Perth)12
    12 hours of daylight per day
  • No heat & humidity in September in Western Australia (Perth)0
    No heat & humidity
  • 71 mm monthly rainfall in September in Western Australia (Perth)71
    71 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Western Australia (Perth)6
    6 (High) UV index
  • 18°C sea temperature in September in Western Australia (Perth)18
    18°C sea temperature

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The September weather guide for Western Australia (Perth) 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 Western Australia destinations

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

All Western Australia destinations

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

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How hot is it in Western Australia in September?

Daytime temperatures usually reach 20°C in Perth, Western Australia in September, falling to 10°C at night.

How sunny is it in Western Australia in September?

There are normally 8 hours of bright sunshine each day in Perth, Western Australia in September - that's 64% of daylight hours.

How warm is the sea around Western Australia in September?

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

Does it rain in Western Australia in September?

There are usually 10 days with some rain in Perth, Western Australia in September and the average monthly rainfall is 71mm.

Western Australia September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:34 18:00
Monday, 15th September 2025 06:16 18:08
Tuesday, 30th September 2025 05:56 18:18

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