Graham Field Weather Forecast

    • 62
    • 85

    Mostly Sunny

    • 62
    • 87

    Chance Thunderstorms

    • 62
    • 77

    Rain Showers

    • 59
    • 73

    Rain Showers Likely

    • 56
    • 71

    Chance Thunderstorms

    • 56
    • 72

    Slight Chance Rain Showers

    • 58
    • 77

    Partly Sunny

Today 15 Sep Union

Sunny. Highs in the mid 80s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 15 Sep Union

Clear. Lows in the lower 60s. South Winds 5 to 10 Mph.

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Graham Field Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (10.6 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    64.2 °F

  • Highest 13 September, 2025

    91.9 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (10.6 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    62.6 °F
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