Gateway Lake Weather Forecast

    • 15
    • 42

    Increasing Clouds

    • 18
    • 31

    Partly Sunny

    • 18
    • 29

    Mostly Cloudy

    • 25
    • 37

    Partly Sunny

    • 24
    • 45

    Partly Sunny

    • 23
    • 43

    Partly Sunny

Today 31 Dec Dakota

Mostly sunny. Highs in the lower 40s. Temperature falling into the mid 30s in the afternoon. West Winds around 5 Mph, becoming north in the afternoon.

Tonight 31 Dec Dakota

Mostly cloudy. Colder with Lows around 15. Northeast Winds 5 to 10 Mph.

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Gateway Lake Temperature Statistics

December Temperature

Sioux City, Sioux Gateway Airport (3.1 miles)

  • Lowest 14 December, 2025

    -11.9 °F

  • Average December

    26.3 °F

  • Highest 27 December, 2025

    54 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (3.1 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    62.8 °F
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