Saint Charles Weather Forecast

    • 56
    • 67

    Rain Showers Likely

    • 58
    • 80

    Rain Showers

    • 41
    • 67

    Partly Sunny

    • 48
    • 67

    Mostly Sunny

    • 60
    • 78

    Chance Thunderstorms

    • 51
    • 78

    Rain Showers

Today 5 Mar St. Charles

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms this morning. Patchy fog this morning. Not as cool with Highs in the upper 60s. West Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 5 Mar St. Charles

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. Southeast Winds 5 to 10 Mph. Chance of rain 30 percent.

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Saint Charles Temperature Statistics

March Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 1 March, 2026

    27 °F

  • Average March

    36.8 °F

  • Highest 1 March, 2026

    45 °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

    69.4 °F
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