Crystal Lake Weather Forecast

    • 74
    • 92

    Chance Thunderstorms

    • 67
    • 91

    Chance Thunderstorms

    • 61
    • 77

    Chance Thunderstorms

    • 58
    • 76

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

    • 57
    • 77

    Mostly Sunny

Today 28 Jul McHenry

Mostly cloudy in the Morning, then clearing. A slight chance of Showers and Thunderstorms through mid morning. Highs in the lower 90s. West Winds 5 to 10 Mph. Chance of precipitation 20 percent. Heat index Values up to 105.

Tonight 28 Jul McHenry

Increasing Clouds. A slight chance of Showers and Thunderstorms. Lows in the mid 70s. West Winds around 5 Mph, becoming southwest after midnight. Chance of precipitation 20 percent. Heat index Values up to 104 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

July Temperature

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

  • Lowest 18 July, 2025

    59.6 °F
  • Average July

    76.7 °F
  • Highest 23 July, 2025

    95.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    44.1 °F
  • Average 2020–2025

    52.9 °F
  • Average High 2020–2025

    61.5 °F
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