Defiance Weather Forecast

    • 46
    • 73

    Mostly Sunny

    • 41
    • 66

    Sunny

    • 39
    • 66

    Sunny

    • 43
    • 68

    Chance Rain Showers

    • 48
    • 59

    Chance Rain Showers

    • 50
    • 63

    Chance Rain Showers

Today 20 Oct St. Charles

Sunny. Highs in the lower 70s. South Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 20 Oct St. Charles

Mostly clear. Lows in the upper 40s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming west 10 to 15 Mph after midnight.

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Defiance Temperature Statistics

October Temperature

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

  • Lowest 9 October, 2025

    42.1 °F

  • Average October

    66.9 °F

  • Highest 3 October, 2025

    88 °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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