Crystal Lake Weather Forecast

    • 40
    • 53

    Mostly Cloudy

    • 34
    • 54

    Slight Chance Rain Showers

    • 31
    • 51

    Slight Chance Rain Showers

    • 38
    • 54

    Chance Rain

    • 36
    • 58

    Mostly Sunny

    • 39
    • 59

    Partly Sunny

Today 30 Oct McHenry

Partly cloudy. Patchy fog early in the morning. Highs in the mid 50s. North Winds 5 to 10 Mph.

Tonight 30 Oct McHenry

Mostly cloudy. Lows in the upper 30s. Northwest Winds around 5 Mph.

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Crystal Lake Temperature Statistics

October Temperature

Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)

  • Lowest 25 October, 2025

    33.1 °F

  • Average October

    58.6 °F

  • Highest 3 October, 2025

    89.1 °F

Climate (2020–Present)

Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    53.1 °F

  • Average High 2020–2025

    61.6 °F
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