Cottonwood Lake Weather Forecast

    • 35
    • 49

    Mostly Cloudy

    • 20
    • 64

    Chance Rain

    • 15
    • 30

    Mostly Cloudy

    • 26
    • 43

    Mostly Sunny

    • 30
    • 53

    Partly Sunny

    • 35
    • 60

    Partly Sunny

Today 24 Mar McHenry

Partly sunny. Highs around 50. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 24 Mar McHenry

Mostly cloudy. A chance of rain after midnight. Lows in the lower 30s. East Winds around 10 Mph. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

March Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 16 March, 2026

    -9.4 °F

  • Average March

    26.3 °F

  • Highest 19 March, 2026

    69.8 °F

Climate (2021–Present)

Harvey Municipal Airport (34.8 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    52 °F
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