Crystal Lake Weather Forecast

    • 57
    • 74

    Decreasing Clouds

    • 56
    • 81

    Partly Sunny

    • 57
    • 81

    Mostly Sunny

    • 58
    • 78

    Mostly Cloudy

    • 58
    • 76

    Chance Thunderstorms

    • 56
    • 76

    Chance Rain Showers

Today 26 Aug Dakota

Partly sunny. A chance of Showers this morning. Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 26 Aug Dakota

Partly cloudy. Not as cool with Lows in the mid 50s. Southeast Winds 5 to 10 Mph.

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Crystal Lake Temperature Statistics

August Temperature

Sioux City, Sioux Gateway Airport (5 miles)

  • Lowest 23 August, 2025

    54 °F

  • Average August

    74.2 °F

  • Highest 16 August, 2025

    93.7 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (5 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    62.6 °F
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