Crystal Lake Weather Forecast

    • 68
    • 90

    Chance Thunderstorms

    • 67
    • 94

    Rain Showers Likely

    • 59
    • 85

    Mostly Sunny

    • 57
    • 79

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

Today 6 Sep Brown

Mostly sunny. A chance of Showers and Thunderstorms in the Morning, then a slight chance of Showers and Thunderstorms in the afternoon. Highs around 90. Southeast Winds 10 to 15 Mph. Chance of precipitation 40 percent.

Tonight 6 Sep Brown

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the upper 60s. Southeast Winds 10 to 20 Mph. Gusts up to 35 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Ainsworth Regional Airport (19.3 miles)

  • Lowest 2 September, 2026

    62.8 °F

  • Average September

    75.9 °F

  • Highest 3 September, 2026

    93.9 °F

Climate (2021–2026)

Ainsworth Regional Airport (19.3 miles)

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  • Average Low 2021–2026

    38.1 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    62.5 °F
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