Algonquin Weather Forecast

    • 39
    • 67

    Slight Chance Thunderstorms

    • 50
    • 60

    Mostly Cloudy

    • 49
    • 59

    Rain Showers Likely

    • 51
    • 66

    Slight Chance Rain Showers

    • 54
    • 67

    Chance Rain Showers

    • 52
    • 67

    Rain Showers Likely

Today 29 Oct McHenry

Mostly cloudy in the Morning, then clearing. A slight chance of Showers and Thunderstorms early in the morning. Highs in the mid 60s. West Winds around 10 Mph, becoming northwest in the afternoon. Chance of precipitation 20 percent.

Tonight 29 Oct McHenry

Clear, cooler with Lows in the upper 30s. North Winds around 5 Mph.

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Algonquin Temperature Statistics

October Temperature

Chicago / West Chicago, Dupage Airport (18.6 miles)

  • Lowest 17 October, 2026

    36 °F

  • Average October

    58.9 °F

  • Highest 12 October, 2026

    87.7 °F

Climate (2021–2026)

Chicago / West Chicago, Dupage Airport (18.6 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    61.6 °F
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