Algonquin Weather Forecast

    • 65
    • 89

    Slight Chance Rain Showers

    • 57
    • 72

    Mostly Cloudy

    • 64
    • 80

    Rain Showers Likely

    • 66
    • 82

    Thunderstorms Likely

    • 64
    • 79

    Chance Thunderstorms

    • 70
    • 84

    Chance Thunderstorms

    • 72
    • 90

    Slight Chance Thunderstorms

Today 16 Jul McHenry

Partly cloudy late in the Morning, then becoming mostly cloudy. Scattered Showers and Thunderstorms in the afternoon. Hot and humid. Highs in the upper 80s. Southwest Winds 5 to 10 Mph, increasing to 10 to 15 Mph with Gusts up to 25 Mph in the afternoon. Chance of precipitation 50 percent.

Tonight 16 Jul McHenry

Mostly cloudy. A slight chance of Showers in the evening. Breezy. Lows in the mid 60s. West Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming northwest 5 to 10 Mph after midnight. Chance of precipitation 20 percent.

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Algonquin Temperature Statistics

July Temperature

Chicago / West Chicago, Dupage Airport (18.6 miles)

  • Lowest 14 July, 2025

    60.1 °F

  • Average July

    77.6 °F

  • Highest 5 July, 2025

    93.7 °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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