Cottonwood Lake Weather Forecast

    • 51
    • 76

    Becoming Sunny

    • 54
    • 82

    Mostly Sunny

    • 45
    • 70

    Partly Sunny

    • 41
    • 62

    Chance Rain Showers

    • 45
    • 61

    Rain Showers

    • 41
    • 61

    Chance Rain Showers

    • 45
    • 66

    Mostly Sunny

Today 9 Sep McHenry

Mostly sunny. Highs in the mid 70s. West Winds 5 to 15 Mph.

Tonight 9 Sep McHenry

Mostly clear. Lows in the upper 40s. Southwest 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 2 September, 2026

    50 °F

  • Average September

    68.3 °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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