Defiance Weather Forecast

    • 36
    • 45

    Mostly Cloudy

    • 16
    • 40

    Slight Chance Snow

    • 23
    • 34

    Partly Sunny

    • 37
    • 50

    Mostly Cloudy

    • 26
    • 48

    Slight Chance Rain

    • 21
    • 42

    Mostly Cloudy

Today 6 Dec St. Charles

Mostly sunny. Highs in the lower 40s. West Winds around 5 Mph, becoming southeast this afternoon.

Tonight 6 Dec St. Charles

Mostly cloudy with a 20 percent chance of rain. Near steady temperature in the mid 30s. Southeast Winds 5 to 10 Mph.

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Defiance Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (6.8 miles)

  • Lowest 3 December, 2025

    15.1 °F

  • Average December

    25.7 °F

  • Highest 3 December, 2025

    37.9 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (6.8 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    68.3 °F
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