Cottonwood Lake Weather Forecast

    • 43
    • 64

    Decreasing Clouds

    • 26
    • 58

    Mostly Cloudy

    • 27
    • 41

    Mostly Cloudy

    • 26
    • 55

    Mostly Cloudy

    • 30
    • 45

    Slight Chance Rain/Snow

    • 25
    • 63

    Breezy

Today 20 Mar McHenry

Mostly sunny. Highs in the upper 50s. Southeast Winds around 5 Mph.

Tonight 20 Mar McHenry

Mostly cloudy. Patchy fog. Lows in the upper 30s. Southeast Winds around 10 Mph, becoming southwest with Gusts up to 20 Mph after midnight.

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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

    22.8 °F

  • Highest 8 March, 2026

    60.8 °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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