Southern Harbour Weather Forecast

    • 12
    • 20

    Showers. Becoming windy

    • 11
    • 19

    Possible shower

    • 12
    • 19

    Shower or two

    • 10
    • 19

    Partly cloudy

    • 9
    • 21

    Mostly sunny

    • 10
    • 21

    Possible shower

    • 9
    • 18

    Shower or two

Today 17 Aug Perth

Cloudy. Very high chance of showers, most likely in the late morning and afternoon. The chance of a thunderstorm in the southwest in the morning. Winds north to northeasterly 15 to 25 km/h shifting westerly 25 to 40 km/h in the middle of the day then decreasing to 20 to 30 km/h in the evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Northerly 15 to 20 knots, shifting west to southwesterly 15 to 25 knots in the middle of the day. Winds reaching up to 30 knots in the late morning and afternoon.
Seas
Around 1 metre, increasing to 1.5 to 2.5 metres during the morning.
1st Swell
West to southwesterly 1.5 to 2 metres, increasing to 2 to 3 metres during the morning.
Weather
Cloudy. Near 100% chance of showers. The chance of a thunderstorm in the morning.
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Southern Harbour Temperature Statistics View More

August Temperature

Garden Island (12km)

  • Lowest 11 August, 2026

    7.7 °C

  • Average August

    14.3 °C

  • Highest 15 August, 2026

    21.8 °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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