Jefferson Weather Forecast

    • 35
    • 59

    Increasing Clouds

    • 39
    • 69

    Partly Sunny

    • 45
    • 77

    Partly Sunny

    • 43
    • 78

    Chance Rain Showers

    • 41
    • 70

    Partly Sunny

    • 51
    • 81

    Slight Chance Thunderstorms

    • 49
    • 83

    Partly Sunny

Today 6 May Union

Partly sunny. Near steady temperature in the mid 50s. Northwest Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 6 May Union

Mostly clear this Evening, then becoming partly cloudy. Lows in the mid 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming south around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Jefferson Temperature Statistics

May Temperature

Sioux City, Sioux Gateway Airport (16.2 miles)

  • Lowest 2 May, 2026

    27.6 °F

  • Average May

    52.6 °F

  • Highest 3 May, 2026

    74.6 °F

Climate (2021–Present)

Sioux City, Sioux Gateway Airport (16.2 miles)

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  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    63.3 °F
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