St Marys Weather Forecast

    • 22
    • 41

    Possible shower or storm

    • 26
    • 37

    Shower or two

    • 19
    • 35

    Mostly sunny

    • 18
    • 35

    Cloud clearing

    • 18
    • 27

    Possible shower

    • 15
    • 26

    Partly cloudy

    • 13
    • 28

    Mostly sunny

Today 21 Dec Sydney

Partly cloudy. Medium chance of showers, most likely in the evening. The chance of a thunderstorm in the afternoon and early evening. Winds northwest to northeasterly 15 to 25 km/h tending southeast to southwesterly 15 to 20 km/h in the evening then becoming light in the late evening.

Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

St Marys Temperature Statistics View More

December Temperature

Penrith Lakes (10km)

  • Lowest 1 December, 2025

    11.3 °C

  • Average December

    23.2 °C

  • Highest 19 December, 2025

    41.9 °C

Climate (2020–Present)

Penrith Lakes (10km)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    12.5 °C

  • Average 2020–2025

    17.7 °C

  • Average High 2020–2025

    24.8 °C
Get WillyWeather+ to remove ads