Defiance Weather Forecast

    • 70
    • 82

    Chance Thunderstorms

    • 65
    • 84

    Partly Sunny

    • 67
    • 88

    Mostly Sunny

    • 65
    • 86

    Mostly Sunny

    • 65
    • 84

    Slight Chance Thunderstorms

    • 67
    • 84

    Slight Chance Rain Showers

    • 68
    • 88

    Slight Chance Thunderstorms

Today 19 Aug St. Charles

Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature around 80. South Winds around 5 Mph. Chance of rain 40 percent.

Tonight 19 Aug St. Charles

Mostly cloudy with a chance of Showers and Thunderstorms. Patchy fog after midnight. Lows around 70. Northeast Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Real-Time

Defiance Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    62.7 °F

  • Average August

    79.8 °F

  • Highest 11 August, 2026

    95.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    68.9 °F
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