Mount Vernon Weather Forecast

    • 20
    • 25

    Cloudy

    • 16
    • 29

    Cloudy

    • 17
    • 37

    Sunny

    • 17
    • 29

    Partly cloudy

    • 17
    • 23

    Shower or two

    • 15
    • 24

    Showers

    • 17
    • 30

    Shower or two

Today 7 Dec Sydney

Partly cloudy. Medium chance of showers, most likely late this afternoon and evening. The chance of a thunderstorm early this morning. Winds west to northwesterly 20 to 30 km/h shifting southeasterly 35 to 50 km/h during the morning then decreasing to 20 to 30 km/h in the late afternoon.

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Mount Vernon Temperature Statistics View More

December Temperature

Horsley Park (4km)

  • Lowest 3 December, 2025

    9.6 °C

  • Average December

    21.9 °C

  • Highest 5 December, 2025

    39 °C

Climate (2020–Present)

Horsley Park (4km)

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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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