Siam Weather Forecast

    • 16
    • 36

    Partly cloudy

    • 18
    • 39

    Sunny

    • 20
    • 40

    Sunny

    • 18
    • 33

    Windy

    • 13
    • 27

    Cloudy

    • 12
    • 31

    Partly cloudy

    • 13
    • 35

    Sunny

Today 27 Dec North West Pastoral

Sunny. Winds east to northeasterly 25 to 35 km/h tending east to southeasterly 15 to 25 km/h in the late afternoon. Overnight temperatures falling to between 19 and 22 with daytime temperatures reaching 35 to 41.

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Siam Temperature Statistics View More

December Temperature

Whyalla Airport (94km)

  • Lowest 2 December, 2025

    10.2 °C

  • Average December

    21.8 °C

  • Highest 18 December, 2025

    42.6 °C

Climate (2020–Present)

Whyalla Airport (94km)

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  • Average Low 2020–2025

    11.8 °C

  • Average 2020–2025

    17.4 °C

  • Average High 2020–2025

    23.7 °C
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