The Basin Weather Forecast

    • 18
    • 22

    Partly cloudy

    • 16
    • 21

    Showers increasing

    • 14
    • 19

    Showers easing. Very windy

    • 15
    • 19

    Possible shower

    • 14
    • 20

    Mostly sunny

    • 14
    • 19

    Possible morning shower

    • 13
    • 19

    Mostly sunny

Today 17 Sep Lower West

Partly cloudy. Light winds.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
North to northwesterly about 10 knots.
Seas
Below 1 metre.
1st Swell
West to southwesterly 1 to 1.5 metres.
Weather
Partly cloudy.
Weather Situation
A trough extends down the west coast. The trough will move inland today ahead of a cold front which will pass over the local waters on Friday before the next ridge begins to develop Saturday.
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  • Temperature Forecast Bureau of Meteorology

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The Basin Temperature Statistics View More

September Temperature

Rottnest Island (3km)

  • Lowest 9 September, 2026

    11.5 °C

  • Average September

    16.7 °C

  • Highest 16 September, 2026

    27.8 °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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