Algonquin Weather Forecast

    • 57
    • 80

    Partly Sunny

    • 56
    • 80

    Mostly Sunny

    • 64
    • 86

    Slight Chance Thunderstorms

    • 64
    • 88

    Slight Chance Thunderstorms

    • 61
    • 85

    Partly Sunny

    • 61
    • 83

    Partly Sunny

    • 61
    • 86

    Partly Sunny

Today 10 Sep McHenry

Partly cloudy. Highs in the upper 70s. South Winds around 5 Mph.

Tonight 10 Sep McHenry

Partly cloudy. Lows in the mid 50s. Northeast Winds around 5 Mph.

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Algonquin Temperature Statistics

September Temperature

Chicago / West Chicago, Dupage Airport (18.6 miles)

  • Lowest 7 September, 2025

    44.1 °F

  • Average September

    60.3 °F

  • Highest 2 September, 2025

    79 °F

Climate (2020–Present)

Chicago / West Chicago, Dupage Airport (18.6 miles)

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  • Average Low 2020–2025

    42 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    61.2 °F
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