Kwinana Grain Jetty Weather Forecast

    • 14
    • 27

    Sunny

    • 17
    • 29

    Sunny

    • 19
    • 33

    Sunny

    • 21
    • 37

    Sunny

    • 27
    • 38

    Mostly sunny

    • 23
    • 28

    Partly cloudy

    • 17
    • 27

    Mostly sunny

Today 21 Dec Perth

Sunny. Winds easterly 20 to 30 km/h shifting south to southwesterly 25 to 35 km/h in the early afternoon then becoming southerly 15 to 20 km/h in the late evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southeasterly 10 to 15 knots tending southerly 15 to 25 knots in the middle of the day. Winds reaching up to 30 knots in the evening.
Seas
Below 1 metre, increasing to 1.5 to 2 metres during the afternoon.
1st Swell
Southwesterly around 1 metre.
Weather
Sunny.
Weather Situation
A ridge over local waters will strengthen today. A weak front will brush the south coast on Monday, followed by the west coast trough returning by Tuesday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Kwinana Grain Jetty Temperature Statistics View More

December Temperature

Garden Island (6km)

  • Lowest 4 December, 2025

    16.4 °C

  • Average December

    21.8 °C

  • Highest 14 December, 2025

    38.8 °C

Climate (2020–Present)

Garden Island (6km)

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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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