Saint Charles Weather Forecast

    • 74
    • 95

    Mostly Sunny

    • 75
    • 95

    Slight Chance Thunderstorms

    • 73
    • 91

    Chance Thunderstorms

    • 72
    • 90

    Chance Thunderstorms

    • 72
    • 91

    Chance Thunderstorms

    • 71
    • 89

    Chance Thunderstorms

Today 4 Jul St. Charles

Mostly sunny. Highs in the lower 90s. South Winds 5 to 10 Mph.

Tonight 4 Jul St. Charles

Mostly clear. Lows in the lower 70s. South Winds around 5 Mph.

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  • Temperature Real-Time

Saint Charles Temperature Statistics

July Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 1 July, 2025

    69.1 °F

  • Average July

    77.2 °F

  • Highest 1 July, 2025

    84.9 °F

Climate (2020–Present)

St. Louis Lambert International Airport (6.2 miles)

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  • Average Low 2020–2025

    50.4 °F

  • Average 2020–2025

    59.6 °F

  • Average High 2020–2025

    69 °F
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