Cottonwood Lake Weather Forecast

    • 56
    • 64

    Rain Showers Likely

    • 53
    • 76

    Mostly Sunny

    • 57
    • 73

    Chance Rain Showers

    • 48
    • 73

    Partly Sunny

    • 51
    • 69

    Rain Showers Likely

    • 45
    • 65

    Rain Showers Likely

    • 43
    • 62

    Partly Sunny

Today 23 Sep McHenry

Showers likely and a chance of Thunderstorms. Southeast Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 60 percent.

Tonight 23 Sep McHenry

Cloudy with a chance of Thunderstorms. Showers likely in the Evening, then a chance of Showers after midnight. Patchy fog. Lows in the mid 50s. Southeast Winds around 10 Mph. Chance of rain 60 percent.

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  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

September Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 13 September, 2026

    35.6 °F

  • Average September

    61.4 °F

  • Highest 4 September, 2026

    84.2 °F

Climate (2021–2026)

Harvey Municipal Airport (34.8 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    51.8 °F
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