Defiance Weather Forecast

    • 53
    • 80

    Chance Thunderstorms

    • 49
    • 71

    Mostly Sunny

    • 45
    • 68

    Partly Sunny

    • 52
    • 70

    Chance Rain Showers

    • 54
    • 68

    Rain Showers Likely

    • 54
    • 68

    Rain Showers Likely

Today 20 May St. Charles

Mostly sunny with isolated Showers and Thunderstorms. Near steady temperature in the upper 70s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

Tonight 20 May St. Charles

Partly cloudy in the Evening, then becoming mostly clear. Less humid with Lows in the mid 50s. West Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Defiance Temperature Statistics

May Temperature

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

  • Lowest 6 May, 2025

    41.6 °F

  • Average May

    63.2 °F

  • Highest 15 May, 2025

    89.7 °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

    56.8 °F

  • Average High 2020–2025

    68.1 °F
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