Saint Charles Weather Forecast

    • 66
    • 82

    Chance Thunderstorms

    • 70
    • 87

    Partly Sunny

    • 69
    • 89

    Rain Showers Likely

    • 64
    • 82

    Rain Showers

    • 62
    • 84

    Chance Rain Showers

    • 63
    • 89

    Rain Showers Likely

Today 12 Apr St. Charles

Mostly sunny this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs in the lower 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 40 percent.

Tonight 12 Apr St. Charles

Mostly cloudy. A chance of Showers and Thunderstorms, mainly in the evening. Lows in the mid 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 40 percent.

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  • Temperature Real-Time

Saint Charles Temperature Statistics

April Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 5 April, 2026

    39 °F

  • Average April

    60.9 °F

  • Highest 3 April, 2026

    83.6 °F

Climate (2021–Present)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2021–2026

    50.5 °F

  • Average 2021–2026

    60 °F

  • Average High 2021–2026

    69.6 °F
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