Saint Charles Weather Forecast

    • 73
    • 87

    Thunderstorms

    • 72
    • 90

    Thunderstorms

    • 70
    • 87

    Chance Thunderstorms

    • 70
    • 89

    Mostly Sunny

    • 71
    • 89

    Mostly Sunny

    • 73
    • 91

    Mostly Sunny

    • 74
    • 93

    Mostly Sunny

Today 9 Jul St. Charles

Mostly cloudy with scattered Showers and Thunderstorms. Near steady temperature in the upper 80s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 9 Jul St. Charles

Mostly cloudy. Scattered Showers and Thunderstorms this Evening, then numerous Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds around 5 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Charles Temperature Statistics

July Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 5 July, 2026

    70.6 °F

  • Average July

    83.2 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

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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