Saint Charles Weather Forecast

    • 10
    • 32

    Becoming Sunny

    • 12
    • 22

    Mostly Sunny

    • 30
    • 38

    Partly Sunny

    • 22
    • 45

    Mostly Sunny

    • 28
    • 37

    Partly Sunny

    • 22
    • 45

    Chance Snow

Today 18 Jan St. Charles

Mostly sunny this Morning, then becoming mostly cloudy. Highs in the lower 30s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Wind chill Values as low as 2 above.

Tonight 18 Jan St. Charles

Partly cloudy in the Evening, then clearing. Lows around 10 above. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph. Wind chill Values as low as 4 below after midnight.

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Saint Charles Temperature Statistics

January Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 15 January, 2026

    17.1 °F

  • Average January

    40.9 °F

  • Highest 6 January, 2026

    66.9 °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

    59.9 °F

  • Average High 2021–2026

    69.3 °F
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