Defiance Weather Forecast

    • 72
    • 93

    Chance Thunderstorms

    • 70
    • 89

    Chance Thunderstorms

    • 69
    • 87

    Chance Thunderstorms

    • 69
    • 88

    Slight Chance Thunderstorms

    • 72
    • 91

    Slight Chance Thunderstorms

    • 72
    • 92

    Chance Thunderstorms

Today 4 Jul St. Charles

Sunny late this Morning, then becoming partly sunny. A slight chance of Showers and Thunderstorms late this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent. Heat index Values up to 105.

Tonight 4 Jul St. Charles

Mostly cloudy in the Evening, then becoming partly cloudy. A chance of Showers and Thunderstorms. Humid with Lows in the lower 70s. Southwest Winds around 5 Mph. Chance of rain 50 percent. Heat index Values up to 100 early in the evening.

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Defiance Temperature Statistics

July Temperature

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

  • Lowest 2 July, 2026

    73.9 °F

  • Average July

    85.2 °F

  • Highest 2 July, 2026

    95 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    68.9 °F
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