Saint Charles Weather Forecast

    • 69
    • 86

    Rain Showers

    • 69
    • 83

    Rain Showers

    • 74
    • 89

    Chance Thunderstorms

    • 77
    • 96

    Mostly Sunny

    • 78
    • 98

    Hot

    • 78
    • 98

    Hot

Today 25 Jun St. Charles

Partly sunny with a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the mid 80s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 25 Jun St. Charles

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers and Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall. Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Saint Charles Temperature Statistics

June Temperature

St. Louis Lambert International Airport (6.2 miles)

  • Lowest 3 June, 2026

    56.6 °F

  • Average June

    75.7 °F

  • Highest 17 June, 2026

    93.7 °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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