Swan River - Heirisson Island Weather Forecast

    • 11
    • 21

    Showers developing

    • 9
    • 19

    Cloudy

    • 10
    • 20

    Shower or two

    • 7
    • 21

    Partly cloudy

    • 7
    • 22

    Mostly sunny

    • 8
    • 23

    Possible shower

    • 8
    • 19

    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.

Melville Waters

Wind
North to northeasterly 10 to 15 knots turning northwesterly 15 to 20 knots in the morning then tending northwest to southwesterly in the middle of the day.
Weather
Cloudy. Near 100% chance of showers.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Swan River - Heirisson Island Temperature Statistics View More

August Temperature

Perth Metro (5km)

  • Lowest 11 August, 2026

    2.5 °C

  • Average August

    12.6 °C

  • Highest 3 August, 2026

    25.3 °C

Climate (2021–2026)

Perth Metro (5km)

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  • Average Low 2021–2026

    13.4 °C

  • Average 2021–2026

    18.8 °C

  • Average High 2021–2026

    25.4 °C
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