Defiance Weather Forecast

    • 50
    • 75

    Rain Showers Likely

    • 49
    • 77

    Mostly Sunny

    • 48
    • 76

    Sunny

    • 54
    • 80

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 61
    • 90

    Mostly Sunny

Today 5 Sep St. Charles

Mostly sunny this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs in the mid 70s. Temperature falling into the lower 70s this afternoon. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 5 Sep St. Charles

Mostly cloudy with a 50 percent chance of Showers. Lows in the lower 50s. West Winds 5 to 10 Mph.

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Defiance Temperature Statistics

September Temperature

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

  • Lowest 1 September, 2025

    57 °F

  • Average September

    68.8 °F

  • Highest 1 September, 2025

    81 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.9 °F

  • Average High 2020–2025

    68.1 °F
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