St Charles Weather Forecast

    • 71
    • 86

    Chance Thunderstorms

    • 75
    • 87

    Chance Thunderstorms

    • 77
    • 93

    Chance Thunderstorms

    • 76
    • 94

    Chance Thunderstorms

    • 78
    • 95

    Slight Chance Thunderstorms

    • 78
    • 98

    Hot

Today 17 Jul St. Charles

Partly sunny. A slight chance of Showers and Thunderstorms in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the upper 80s. North Winds around 5 Mph. Chance of rain 50 percent. Heat index Values up to 100.

Tonight 17 Jul St. Charles

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 70s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

St Charles Temperature Statistics

July Temperature

St. Louis Lambert International Airport (7.5 miles)

  • Lowest 2 July, 2025

    68 °F

  • Average July

    81.2 °F

  • Highest 11 July, 2025

    94.6 °F

Climate (2020–Present)

St. Louis Lambert International Airport (7.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    50.3 °F

  • Average 2020–2025

    59.6 °F

  • Average High 2020–2025

    69 °F
Get WillyWeather+ to remove ads