Cottonwood Lake Weather Forecast

    • 34
    • 45

    Cloudy

    • 33
    • 54

    Mostly Cloudy

    • 45
    • 71

    Chance Thunderstorms

    • 42
    • 68

    Slight Chance Rain Showers

    • 44
    • 66

    Slight Chance Thunderstorms

    • 48
    • 73

    Partly Sunny

Today 18 May McHenry

Patchy fog in the morning. Cloudy. Highs in the mid 40s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 18 May McHenry

Cloudy with a 20 percent chance of rain Showers. Patchy fog. Lows in the mid 30s. North Winds 10 to 15 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

    52.1 °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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