Cottonwood Lake Weather Forecast

    • 39
    • 66

    Partly Sunny

    • 38
    • 63

    Mostly Cloudy

    • 23
    • 54

    Slight Chance Rain/Snow

    • 25
    • 38

    Partly Sunny

    • 25
    • 52

    Breezy

    • 27
    • 44

    Chance Rain/Snow

Today 19 Mar McHenry

Patchy fog in the morning. Partly sunny. Highs in the lower 60s. South Winds 5 to 10 Mph, becoming west around 15 Mph in the afternoon.

Tonight 19 Mar McHenry

Mostly cloudy. Patchy fog. Lows around 30. Southeast Winds 5 to 10 Mph.

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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

    21.7 °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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