Crystal Lake Weather Forecast

    • 62
    • 77

    Rain Showers

    • 61
    • 82

    Mostly Sunny

    • 62
    • 85

    Mostly Sunny

    • 61
    • 86

    Partly Sunny

    • 62
    • 86

    Partly Sunny

    • 60
    • 83

    Chance Rain Showers

Today 13 Sep McHenry

Mostly cloudy. Numerous Showers and scattered Thunderstorms in the Morning, then a slight chance of Showers and Thunderstorms in the afternoon. Highs in the upper 70s. Southeast Winds 5 to 10 Mph. Chance of precipitation 70 percent.

Tonight 13 Sep McHenry

Mostly cloudy early in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 60s. East Winds around 5 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

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

  • Lowest 7 September, 2025

    46.9 °F

  • Average September

    63.3 °F

  • Highest 10 September, 2025

    80.1 °F

Climate (2020–Present)

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

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    61.5 °F
Get WillyWeather+ to remove ads