Merriwa Weather Forecast

    • 20
    • 28

    Partly cloudy

    • 19
    • 25

    Partly cloudy

    • 16
    • 31

    Sunny

    • 18
    • 30

    Sunny

    • 17
    • 29

    Sunny

    • 15
    • 29

    Sunny

    • 17
    • 29

    Sunny

Today 16 Dec Perth

Mostly sunny. The chance of smoke haze in the early morning. The chance of morning fog. Light winds becoming west to southwesterly 20 to 30 km/h in the morning.

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Merriwa Temperature Statistics View More

December Temperature

Gingin Airport (26km)

  • Lowest 4 December, 2025

    9.6 °C

  • Average December

    23.5 °C

  • Highest 14 December, 2025

    40.9 °C

Climate (2020–Present)

Gingin Airport (26km)

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  • Average Low 2020–2025

    11.5 °C

  • Average 2020–2025

    18.3 °C

  • Average High 2020–2025

    26.2 °C
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