Jones-Confluence Point State Park Weather Forecast

    • 71
    • 100

    Hot

    • 65
    • 91

    Becoming Sunny

    • 65
    • 91

    Mostly Sunny

    • 74
    • 97

    Hot

    • 71
    • 101

    Chance Thunderstorms

    • 65
    • 88

    Slight Chance Rain Showers

    • 65
    • 89

    Chance Rain Showers

Today 5 Sep St. Charles

Sunny, hot. Near steady temperature in the upper 90s. Northwest Winds 5 to 10 Mph. Heat index Values up to 109.

Tonight 5 Sep St. Charles

Partly cloudy. A slight chance of Showers and Thunderstorms this evening. Lows in the lower 70s. Northeast Winds around 5 Mph. Gusts up to 20 Mph after midnight. Chance of rain 20 percent. Heat index Values up to 104 early this evening.

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Jones-Confluence Point State Park Temperature Statistics

September Temperature

St. Louis Regional Airport (6.2 miles)

  • Lowest 1 September, 2026

    70.2 °F

  • Average September

    81.9 °F

  • Highest 1 September, 2026

    98.6 °F

Climate (2021–2026)

St. Louis Regional Airport (6.2 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    66.6 °F
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