Cottonwood Lake Weather Forecast

    • 61
    • 73

    Rain Showers

    • 56
    • 73

    Rain Showers Likely

    • 55
    • 75

    Partly Sunny

    • 51
    • 71

    Chance Rain Showers

    • 50
    • 67

    Slight Chance Rain Showers

    • 49
    • 68

    Mostly Cloudy

Today 14 Sep McHenry

Patchy fog in the morning. Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Morning, then Showers likely in the afternoon. Highs in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 14 Sep McHenry

Cloudy with a 20 percent chance of Showers. Areas of fog. Lows in the lower 60s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

September Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 7 September, 2025

    33.8 °F

  • Average September

    57.1 °F

  • Highest 1 September, 2025

    80.6 °F

Climate (2020–Present)

Harvey Municipal Airport (34.8 miles)

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  • Average Low 2020–2025

    30.1 °F

  • Average 2020–2025

    41.1 °F

  • Average High 2020–2025

    51.8 °F
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