Jefferson Weather Forecast

    • 26
    • 49

    Gradual Clearing

    • 34
    • 54

    Mostly Cloudy

    • 43
    • 66

    Mostly Cloudy

    • 47
    • 81

    Partly Sunny

    • 24
    • 64

    Mostly Cloudy

    • 26
    • 49

    Partly Sunny

Today 22 Mar Union

Mostly cloudy. Much cooler with Highs in the upper 40s. North Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 22 Mar Union

Mostly clear. Cooler with Lows in the mid 20s. North Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming east around 5 Mph after midnight.

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Jefferson Temperature Statistics

March Temperature

Sioux City, Sioux Gateway Airport (16.2 miles)

  • Lowest 16 March, 2026

    5.6 °F

  • Average March

    40.2 °F

  • Highest 20 March, 2026

    82 °F

Climate (2021–Present)

Sioux City, Sioux Gateway Airport (16.2 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    63.2 °F
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