Cottonwood Lake Weather Forecast

    • 26
    • 56

    Increasing Clouds

    • 31
    • 49

    Chance Rain/Snow

    • 19
    • 58

    Chance Rain

    • 15
    • 29

    Partly Sunny

    • 23
    • 42

    Mostly Sunny

    • 30
    • 53

    Mostly Sunny

Today 23 Mar McHenry

Partly sunny. Highs in the mid 50s. South Winds around 15 Mph, becoming northwest in the afternoon.

Tonight 23 Mar McHenry

Partly cloudy. Lows in the mid 20s. North Winds 10 to 15 Mph, becoming east 5 to 10 Mph after midnight.

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  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

March Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 16 March, 2026

    -9.4 °F

  • Average March

    26.2 °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

    41.3 °F

  • Average High 2021–2026

    52 °F
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