Cottonwood Lake Weather Forecast

    • 46
    • 67

    Decreasing Clouds

    • 51
    • 76

    Partly Sunny

    • 39
    • 74

    Chance Rain Showers

    • 35
    • 49

    Chance Rain/Snow

    • 32
    • 46

    Slight Chance Rain/Snow

    • 33
    • 53

    Partly Sunny

Today 8 Oct McHenry

Decreasing Clouds. Highs in the mid 60s. South Winds around 5 Mph.

Tonight 8 Oct McHenry

Increasing Clouds. Lows in the mid 40s. Southeast Winds around 5 Mph.

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Cottonwood Lake Temperature Statistics

October Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 2 October, 2026

    33.8 °F

  • Average October

    51.2 °F

  • Highest 5 October, 2026

    73.4 °F

Climate (2021–2026)

Harvey Municipal Airport (34.8 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.7 °F
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