Crystal Lake Weather Forecast

    • 39
    • 67

    Slight Chance Thunderstorms

    • 50
    • 60

    Mostly Cloudy

    • 49
    • 59

    Rain Showers Likely

    • 52
    • 66

    Slight Chance Rain Showers

    • 54
    • 67

    Chance Rain Showers

    • 53
    • 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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  • Temperature Real-Time

Crystal Lake Temperature Statistics

October Temperature

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

  • Lowest 17 October, 2026

    37.7 °F

  • Average October

    60.1 °F

  • Highest 12 October, 2026

    88.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.5 °F
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