The Basin Weather Forecast

    • 17
    • 23

    Clear

    • 18
    • 22

    Mostly sunny

    • 16
    • 21

    Showers increasing

    • 14
    • 19

    Showers easing. Very windy

    • 15
    • 19

    Cloudy

    • 15
    • 19

    Partly cloudy

    • 15
    • 19

    Shower or two

Today 16 Sep Lower West

Partly cloudy. Winds east to northeasterly 15 to 20 km/h.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Variable below 10 knots.
Seas
Below 0.5 metres.
1st Swell
Southwesterly 1 to 1.5 metres.
Weather
Clear.
Weather Situation
A trough extends down the west coast. From Thursday, the trough will become mobile and move inland, ahead of a cold front crossing the local waters on Friday before the next ridge begins to develop.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

The Basin Temperature Statistics View More

September Temperature

Rottnest Island (3km)

  • Lowest 9 September, 2026

    11.5 °C

  • Average September

    16.1 °C

  • Highest 11 September, 2026

    23.3 °C

Climate (2021–2026)

Rottnest Island (3km)

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  • Average Low 2021–2026

    16.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    22.8 °C
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