Southern Harbour Weather Forecast

    • 11
    • 20

    Showers

    • 11
    • 20

    Possible early shower

    • 10
    • 22

    Mostly sunny

    • 11
    • 22

    Partly cloudy

    • 10
    • 22

    Mostly sunny

    • 12
    • 23

    Partly cloudy

    • 13
    • 22

    Possible shower

Today 5 Sep Perth

Cloudy. Very high chance of showers. The chance of a thunderstorm near the coast early this evening. Winds northwesterly 15 to 25 km/h tending northerly in the late afternoon then becoming light in the evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northwesterly 15 to 20 knots becoming variable about 10 knots in the evening.
Seas
1 to 1.5 metres, decreasing below 1 metre by early evening.
1st Swell
Southwesterly 2 to 3 metres.
Weather
Cloudy. 95% chance of showers. The chance of a thunderstorm early this evening.
Weather Situation
Northwesterly winds prevail over the local waters this afternoon, ahead of a stronger cold front which will cross the west coast tonight. A southeasterly change will move over the local waters Sunday morning as new ridge extends into the Bight. Winds tend easterly mid-week as the high pressure centre arrives in the Bight, continuing east.
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  • Temperature Forecast Bureau of Meteorology

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Southern Harbour Temperature Statistics View More

September Temperature

Garden Island (12km)

  • Lowest 1 September, 2026

    10.2 °C

  • Average September

    15.6 °C

  • Highest 3 September, 2026

    18.6 °C

Climate (2021–2026)

Garden Island (12km)

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  • Average Low 2021–2026

    15.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    23.3 °C
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