Crystal Lake Weather Forecast

    • 60
    • 80

    Rain Showers Likely

    • 58
    • 74

    Rain Showers Likely

    • 59
    • 78

    Chance Thunderstorms

    • 59
    • 81

    Chance Thunderstorms

    • 55
    • 79

    Slight Chance Thunderstorms

    • 53
    • 75

    Mostly Sunny

Today 18 Sep Hancock

Partly sunny. A slight chance of Showers in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Humid with Highs around 80. South Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 18 Sep Hancock

Showers likely with a chance of Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Lows around 60. South Winds around 5 Mph. Chance of rain 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Forest City Municipal Airport (8.1 miles)

  • Lowest 7 September, 2025

    35.6 °F

  • Average September

    62.7 °F

  • Highest 13 September, 2025

    91.4 °F

Climate (2020–Present)

Forest City Municipal Airport (8.1 miles)

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

  • Average Low 2020–2025

    36.6 °F

  • Average 2020–2025

    47.2 °F

  • Average High 2020–2025

    57.2 °F
Get WillyWeather+ to remove ads