Marengo Weather Forecast

    • 55
    • 71

    Gradual Clearing

    • 66
    • 81

    Partly Sunny

    • 65
    • 83

    Thunderstorms Likely

    • 63
    • 79

    Chance Thunderstorms

    • 69
    • 83

    Chance Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

Today 17 Jul McHenry

Mostly cloudy. Highs in the lower 70s. North Winds 5 to 10 Mph.

Tonight 17 Jul McHenry

Mostly cloudy early in the Evening, then becoming partly cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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Marengo Temperature Statistics

July Temperature

De Kalb Taylor Municipal Airport (22.4 miles)

  • Lowest 14 July, 2025

    59.9 °F

  • Average July

    74.4 °F

  • Highest 5 July, 2025

    91 °F

Climate (2020–Present)

De Kalb Taylor Municipal Airport (22.4 miles)

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  • Average Low 2020–2025

    40.3 °F

  • Average 2020–2025

    49.4 °F

  • Average High 2020–2025

    58.5 °F
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