The Basin Weather Forecast

    • 15
    • 19

    Possible morning shower

    • 14
    • 19

    Partly cloudy

    • 13
    • 20

    Possible shower. Windy

    • 11
    • 17

    Shower or two. Wind easing

    • 12
    • 18

    Showers

    • 15
    • 19

    Shower or two

    • 14
    • 19

    Partly cloudy

Today 23 Sep Lower West

Partly cloudy. The chance of fog early this morning, mainly inland. Medium chance of showers, most likely in the morning and early afternoon. Light winds becoming southwesterly 15 to 20 km/h in the morning then becoming light in the evening. Daytime maximum temperatures in the low 20s.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly about 10 knots.
Seas
Below 1 metre.
1st Swell
Southwesterly 1 to 2 metres, decreasing to 1 to 1.5 metres around midday.
Weather
Partly cloudy.
Weather Situation
A ridge sits over the local waters. A cold front will pass to the south on Thursday and a deep low pressure system developing inland on Friday will cause winds to freshen.
Graph Plots Open in Graphs

  • 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

    16.7 °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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