St Marys South Weather Forecast

    • 17
    • 35

    Sunny

    • 18
    • 25

    Possible shower

    • 15
    • 22

    Cloudy

    • 13
    • 26

    Mostly sunny

    • 13
    • 27

    Partly cloudy

    • 15
    • 28

    Partly cloudy

    • 14
    • 33

    Sunny

Today 24 Dec Sydney

Mostly sunny. Slight chance of a shower along the coastal fringe later tonight. Near zero chance of rain elsewhere. Winds north to northwesterly 15 to 20 km/h shifting southerly 20 to 30 km/h during the afternoon and 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

    22.9 °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

    17.3 °C

  • Average High 2020–2025

    23.7 °C
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