North Sioux City Weather Forecast

    • 72
    • 90

    Decreasing Clouds

    • 70
    • 91

    Partly Sunny

    • 64
    • 84

    Chance Thunderstorms

    • 63
    • 83

    Chance Thunderstorms

    • 63
    • 82

    Slight Chance Thunderstorms

    • 63
    • 84

    Slight Chance Thunderstorms

Today 7 Aug Union

Mostly sunny. Humid with Highs in the upper 80s. Southeast Winds 10 to 15 Mph. Heat index Values up to 102 in the afternoon.

Tonight 7 Aug Union

Partly cloudy. Humid with Lows in the lower 70s. Southeast Winds 10 to 15 Mph. Heat index Values up to 101 early in the evening.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

North Sioux City Temperature Statistics

August Temperature

Sioux City, Sioux Gateway Airport (9.9 miles)

  • Lowest 2 August, 2025

    55 °F

  • Average August

    65.5 °F

  • Highest 3 August, 2025

    75 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (9.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    62.6 °F
Get WillyWeather+ to remove ads