O'Sullivan Beach Weather Forecast

    • 17
    • 23

    Cloudy

    • 13
    • 23

    Mostly sunny

    • 12
    • 27

    Sunny

    • 15
    • 31

    Sunny

    • 17
    • 30

    Partly cloudy

    • 15
    • 28

    Mostly sunny

    • 16
    • 30

    Sunny

Today 30 Dec Adelaide

Cloudy. Winds south to southeasterly 25 to 40 km/h.

Adelaide Metropolitan Waters

Wind
Southerly 15 to 25 knots, reaching up to 30 knots north of Grange in the late afternoon.
Seas
1 to 1.5 metres, increasing to 1.5 to 2 metres north of Grange during the morning.
1st Swell
West to southwesterly below 0.5 metres.
Weather
Cloudy.
Weather Situation
A weak ridge of high pressure will develop south of the Bight today, persisting into Friday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

O'Sullivan Beach Temperature Statistics View More

December Temperature

Noarlunga (5km)

  • Lowest 2 December, 2025

    11.1 °C

  • Average December

    21.1 °C

  • Highest 14 December, 2025

    40.6 °C

Climate (2020–Present)

Noarlunga (5km)

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  • Average Low 2020–2025

    12.7 °C

  • Average 2020–2025

    16.6 °C

  • Average High 2020–2025

    21.7 °C
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