Maple Island Conservation Area Weather Forecast

    • 67
    • 91

    Rain Showers Likely

    • 62
    • 73

    Chance Rain Showers

    • 55
    • 75

    Mostly Cloudy

    • 54
    • 77

    Partly Sunny

    • 56
    • 78

    Mostly Cloudy

    • 58
    • 79

    Mostly Cloudy

    • 59
    • 81

    Mostly Cloudy

Today 20 Sep St. Charles

Mostly sunny. Highs in the mid 80s.

Tonight 20 Sep St. Charles

Mostly cloudy with a chance of Thunderstorms. A chance of Showers this Evening, then Showers likely after midnight. Lows in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 70 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

    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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