Saint Charles Weather Forecast

    • 63
    • 81

    Thunderstorms Likely

    • 52
    • 84

    Thunderstorms Likely

    • 49
    • 73

    Chance Thunderstorms

    • 46
    • 68

    Mostly Sunny

    • 48
    • 69

    Partly Sunny

    • 46
    • 67

    Partly Sunny

Today 26 Apr St. Charles

Sunny. Highs around 80. Southeast Winds 5 to 10 Mph.

Tonight 26 Apr St. Charles

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Charles Temperature Statistics

April Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 5 April, 2026

    39.7 °F

  • Average April

    64.3 °F

  • Highest 14 April, 2026

    89.7 °F

Climate (2021–Present)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2021–2026

    50.6 °F

  • Average 2021–2026

    60.1 °F

  • Average High 2021–2026

    69.7 °F
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