Cottonwood Lake Weather Forecast

    • 51
    • 79

    Sunny

    • 57
    • 82

    Mostly Sunny

    • 60
    • 84

    Chance Rain Showers

    • 57
    • 83

    Chance Rain Showers

    • 54
    • 80

    Chance Rain Showers

    • 53
    • 76

    Mostly Sunny

    • 55
    • 79

    Chance Rain Showers

Today 26 Aug McHenry

Sunny. Highs in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 26 Aug McHenry

Mostly clear. Lows in the upper 40s. North Winds around 5 Mph in the Evening, becoming light and variable.

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Cottonwood Lake Temperature Statistics

August Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 5 August, 2026

    42.8 °F

  • Average August

    67.6 °F

  • Highest 2 August, 2026

    98.6 °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

    51.8 °F
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