Saint Charles Weather Forecast

    • 65
    • 87

    Mostly Sunny

    • 41
    • 86

    Partly Sunny

    • 42
    • 59

    Partly Sunny

    • 45
    • 62

    Mostly Cloudy

    • 54
    • 69

    Partly Sunny

    • 42
    • 80

    Partly Sunny

Today 21 Mar St. Charles

Sunny. Highs in the mid 80s. East Winds around 5 Mph, becoming south in the afternoon.

Tonight 21 Mar St. Charles

Mostly clear. Not as cool with Lows in the lower 60s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Charles Temperature Statistics

March Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 16 March, 2026

    20.6 °F

  • Average March

    51.5 °F

  • Highest 10 March, 2026

    87.7 °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

    69.5 °F
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