Cottonwood Lake Weather Forecast

    • 54
    • 75

    Increasing Clouds

    • 44
    • 77

    Breezy

    • 29
    • 52

    Breezy

    • 27
    • 44

    Mostly Cloudy

    • 29
    • 45

    Partly Sunny

    • 35
    • 50

    Mostly Cloudy

Today 22 Oct McHenry

Sunny. Highs in the mid 70s. South Winds 10 to 15 Mph.

Tonight 22 Oct McHenry

Increasing Clouds. Lows in the lower 50s. Southeast Winds 5 to 10 Mph.

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Cottonwood Lake Temperature Statistics

October Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 19 October, 2026

    24.8 °F

  • Average October

    49.3 °F

  • Highest 9 October, 2026

    75.2 °F

Climate (2021–2026)

Harvey Municipal Airport (34.8 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.7 °F
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