Cottonwood Lake Weather Forecast

    • 58
    • 84

    Slight Chance Thunderstorms

    • 56
    • 82

    Partly Sunny

    • 51
    • 82

    Mostly Sunny

    • 56
    • 80

    Mostly Cloudy

    • 60
    • 81

    Chance Rain Showers

    • 59
    • 85

    Mostly Sunny

    • 56
    • 83

    Mostly Sunny

Today 19 Aug McHenry

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 80s. South Winds around 5 Mph. Chance of rain 20 percent.

Tonight 19 Aug McHenry

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid 50s. South Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 20 percent.

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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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