Maple Island Conservation Area Weather Forecast

    • 68
    • 85

    Gradual Clearing

    • 69
    • 92

    Partly Sunny

    • 66
    • 91

    Chance Rain Showers

    • 71
    • 90

    Mostly Sunny

    • 72
    • 96

    Chance Rain Showers

    • 71
    • 94

    Chance Thunderstorms

    • 67
    • 89

    Chance Rain Showers

Today 11 Sep St. Charles

Cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 11 Sep St. Charles

Mostly cloudy with a slight chance of Showers this Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 20 percent.

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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

    80.2 °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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