Cuivre Island Conservation Area Weather Forecast

    • 48
    • 74

    Sunny

    • 52
    • 78

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

    • 65
    • 92

    Mostly Sunny

    • 65
    • 93

    Partly Sunny

Today 7 Sep St. Charles

Sunny. Highs in the mid 70s. North Winds 5 to 10 Mph.

Tonight 7 Sep St. Charles

Clear. Lows in the upper 40s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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Cuivre Island Conservation Area Temperature Statistics

September Temperature

St. Charles, St. Charles County Smartt Airport (12.4 miles)

  • Lowest 3 September, 2025

    55.9 °F

  • Average September

    68.6 °F

  • Highest 3 September, 2025

    84.9 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (12.4 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.6 °F

  • Average High 2020–2025

    68.4 °F
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