Cottonwood Lake Weather Forecast

    • 49
    • 70

    Slight Chance Thunderstorms

    • 43
    • 60

    Rain Showers Likely

    • 46
    • 70

    Partly Sunny

    • 54
    • 80

    Partly Sunny

    • 58
    • 85

    Mostly Sunny

    • 57
    • 86

    Breezy

Today 21 May McHenry

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs around 70. South Winds 15 to 20 Mph.

Tonight 21 May McHenry

Mostly cloudy with a 30 percent chance of Showers. Lows in the upper 40s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

May Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 7 May, 2026

    23 °F

  • Average May

    50.6 °F

  • Highest 11 May, 2026

    80.6 °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

    51.9 °F
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