Cottonwood Lake Weather Forecast

    • 45
    • 70

    Chance Rain Showers

    • 53
    • 70

    Mostly Cloudy

    • 54
    • 73

    Chance Rain Showers

    • 53
    • 70

    Chance Rain Showers

    • 52
    • 69

    Chance Rain Showers

    • 52
    • 72

    Partly Sunny

    • 52
    • 72

    Partly Sunny

Today 16 Sep McHenry

Mostly cloudy with a slight chance of Showers. Highs in the upper 60s. East Winds 5 to 10 Mph.

Tonight 16 Sep McHenry

Mostly cloudy. Patchy fog after midnight. Lows in the lower 40s. Northeast Winds around 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

September Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 13 September, 2026

    35.6 °F

  • Average September

    63.9 °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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