Gateway Lake Weather Forecast

    • 76
    • 93

    Mostly Sunny

    • 72
    • 101

    Slight Chance Thunderstorms

    • 62
    • 89

    Mostly Sunny

    • 64
    • 83

    Chance Thunderstorms

    • 65
    • 84

    Chance Rain Showers

    • 67
    • 87

    Partly Sunny

Today 19 Jul Dakota

Mostly sunny. Humid with Highs in the lower 90s. Southeast Winds 5 to 10 Mph.

Tonight 19 Jul Dakota

Mostly clear. Humid with Lows in the mid 70s. South Winds around 10 Mph with Gusts up to 20 Mph. Heat index Values in the upper 90s early in the evening.

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Gateway Lake Temperature Statistics

July Temperature

Sioux City, Sioux Gateway Airport (3.1 miles)

  • Lowest 5 July, 2026

    61.6 °F

  • Average July

    78 °F

  • Highest 14 July, 2026

    91.7 °F

Climate (2021–2026)

Sioux City, Sioux Gateway Airport (3.1 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.2 °F

  • Average High 2021–2026

    63.4 °F
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