Maple Island Conservation Area Weather Forecast

    • 74
    • 99

    Chance Thunderstorms

    • 74
    • 97

    Hot

    • 73
    • 98

    Hot

    • 69
    • 94

    Rain Showers Likely

    • 62
    • 85

    Chance Thunderstorms

    • 58
    • 77

    Mostly Cloudy

    • 59
    • 80

    Partly Sunny

Today 17 Sep St. Charles

Sunny with a chance of Showers and Thunderstorms. Hot. Near steady temperature in the mid 90s. West Winds around 5 Mph. Chance of rain 30 percent. Heat index Values up to 106.

Tonight 17 Sep St. Charles

Mostly clear. A slight chance of Showers and Thunderstorms this evening. Lows in the lower 70s. Southwest Winds around 5 Mph, becoming northwest after midnight. Chance of rain 20 percent. Heat index Values up to 101 early this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Maple Island Conservation Area Temperature Statistics

September Temperature

St. Louis Regional Airport (6.2 miles)

  • Lowest 8 September, 2026

    59 °F

  • Average September

    77.2 °F

  • Highest 5 September, 2026

    100.4 °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

    66.7 °F
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