Maple Island Conservation Area Weather Forecast

    • 65
    • 93

    Increasing Clouds

    • 66
    • 89

    Chance Thunderstorms

    • 66
    • 87

    Slight Chance Thunderstorms

    • 66
    • 88

    Chance Thunderstorms

    • 65
    • 86

    Chance Thunderstorms

    • 63
    • 86

    Chance Thunderstorms

Today 18 Sep St. Charles

Sunny. Highs in the lower 90s. Southeast Winds around 5 Mph.

Tonight 18 Sep St. Charles

Partly cloudy. A slight chance of Showers after midnight. Lows in the mid 60s. Southeast 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, 2025

    43.5 °F

  • Average September

    64.9 °F

  • Highest 14 September, 2025

    96.8 °F

Climate (2020–Present)

St. Louis Regional Airport (6.2 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    53.9 °F

  • Average High 2020–2025

    66 °F
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