Maple Island Conservation Area Weather Forecast

    • 57
    • 75

    Mostly Cloudy

    • 57
    • 77

    Mostly Cloudy

    • 59
    • 79

    Partly Sunny

    • 56
    • 81

    Mostly Cloudy

    • 57
    • 76

    Slight Chance Rain Showers

    • 59
    • 81

    Partly Sunny

    • 62
    • 84

    Partly Sunny

Today 22 Sep St. Charles

Partly sunny with a chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Tonight 22 Sep St. Charles

Mostly cloudy this Evening, then becoming partly cloudy. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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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

    77.5 °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

    54.6 °F

  • Average High 2021–2026

    66.7 °F
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