Crystal Lake Weather Forecast

    • 47
    • 70

    Rain Showers

    • 65
    • 75

    Rain Showers Likely

    • 59
    • 82

    Rain Showers Likely

    • 63
    • 70

    Rain Showers

    • 61
    • 76

    Chance Rain Showers

    • 61
    • 74

    Chance Rain Showers

    • 60
    • 77

    Chance Rain Showers

Today 13 Sep McHenry

Mostly cloudy. Scattered Showers. Temperatures in the lower 60s. Northwest Winds 5 to 10 Mph. Chance of precipitation 50 percent.

Tonight 13 Sep McHenry

Mostly clear. Patchy fog late. Lows in the mid 40s. Northwest Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

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

  • Lowest 11 September, 2026

    57 °F

  • Average September

    76.1 °F

  • Highest 2 September, 2026

    96.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.6 °F
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