St Marys South Weather Forecast

    • 22
    • 41

    Possible shower or storm

    • 26
    • 37

    Shower or two

    • 19
    • 34

    Possible shower

    • 17
    • 35

    Partly cloudy

    • 17
    • 30

    Possible shower

    • 16
    • 28

    Partly cloudy

    • 15
    • 27

    Partly cloudy

Today 21 Dec Sydney

Partly cloudy. Medium chance of showers during this afternoon and evening. The chance of a thunderstorm during this afternoon and early evening. Light winds becoming northwest to northeasterly 15 to 25 km/h in the middle of the day then tending south to southwesterly 15 to 20 km/h in the evening.

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St Marys South Temperature Statistics View More

December Temperature

Horsley Park (11km)

  • Lowest 3 December, 2025

    9.6 °C

  • Average December

    22.4 °C

  • Highest 19 December, 2025

    41 °C

Climate (2020–Present)

Horsley Park (11km)

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  • Average Low 2020–2025

    12.2 °C

  • Average 2020–2025

    17.2 °C

  • Average High 2020–2025

    23.6 °C
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