Gateway Lake Weather Forecast

    • 71
    • 92

    Partly Sunny

    • 69
    • 89

    Chance Thunderstorms

    • 70
    • 89

    Chance Thunderstorms

    • 70
    • 90

    Slight Chance Thunderstorms

    • 70
    • 91

    Slight Chance Thunderstorms

    • 69
    • 90

    Partly Sunny

Today 30 Aug Dakota

Mostly sunny. A chance of Showers this morning. Highs in the lower 90s. South Winds 5 to 10 Mph. Chance of rain 30 percent. Heat index Values in the upper 90s.

Tonight 30 Aug Dakota

Partly cloudy. Humid with Lows in the lower 70s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gateway Lake Temperature Statistics

August Temperature

Sioux City, Sioux Gateway Airport (3.1 miles)

  • Lowest 8 August, 2026

    50.6 °F

  • Average August

    72.7 °F

  • Highest 11 August, 2026

    94.6 °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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