Alcoa Jetty Weather Forecast

    • 20
    • 25

    Partly cloudy

    • 17
    • 32

    Sunny

    • 18
    • 30

    Sunny

    • 17
    • 30

    Sunny

    • 15
    • 29

    Sunny

    • 17
    • 31

    Sunny

    • 18
    • 33

    Sunny

Today 17 Dec Perth

Partly cloudy. Winds southwesterly 20 to 30 km/h turning southerly 15 to 20 km/h in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly 15 to 20 knots turning southerly 20 to 25 knots in the afternoon.
Seas
Around 1 metre, increasing to 1.5 metres by early evening.
1st Swell
West to southwesterly around 1 metre, increasing to 1.5 to 2.5 metres during the morning.
Weather
Partly cloudy.
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Alcoa Jetty Temperature Statistics View More

December Temperature

Garden Island (10km)

  • Lowest 4 December, 2025

    16.4 °C

  • Average December

    22.1 °C

  • Highest 14 December, 2025

    38.8 °C

Climate (2020–Present)

Garden Island (10km)

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  • Average Low 2020–2025

    15.2 °C

  • Average 2020–2025

    19 °C

  • Average High 2020–2025

    23.4 °C
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