Maple Island Conservation Area Weather Forecast

    • 72
    • 89

    Mostly Sunny

    • 72
    • 98

    Thunderstorms

    • 75
    • 96

    Chance Thunderstorms

    • 73
    • 97

    Hot

    • 73
    • 97

    Hot

    • 71
    • 96

    Partly Sunny

    • 67
    • 91

    Chance Rain Showers

Today 14 Sep St. Charles

Sunny. Near steady temperature in the mid 80s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 14 Sep St. Charles

Mostly clear. Not as cool with Lows in the lower 70s. Southeast 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

    78.3 °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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