North Sioux City Weather Forecast

    • 58
    • 80

    Chance Thunderstorms

    • 70
    • 91

    Chance Thunderstorms

    • 76
    • 100

    Hot

    • 78
    • 102

    Hot

    • 71
    • 100

    Chance Thunderstorms

    • 63
    • 89

    Rain Showers Likely

Today 18 Jun Union

Cloudy this Morning, then becoming partly sunny. Patchy fog this morning. A chance of Showers and Thunderstorms. Highs around 80. North Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 18 Jun Union

Mostly clear. A chance of Showers and Thunderstorms in the evening. Lows in the upper 50s. Northwest Winds 5 to 10 Mph, becoming southwest after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

North Sioux City Temperature Statistics

June Temperature

Sioux City, Sioux Gateway Airport (9.9 miles)

  • Lowest 4 June, 2025

    46.7 °F

  • Average June

    70.1 °F

  • Highest 2 June, 2025

    94.6 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (9.9 miles)

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  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    62.6 °F
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