Gateway Lake Weather Forecast

    • 57
    • 73

    Chance Rain Showers

    • 56
    • 72

    Chance Rain Showers

    • 58
    • 75

    Chance Rain Showers

    • 59
    • 78

    Slight Chance Thunderstorms

    • 53
    • 78

    Slight Chance Thunderstorms

    • 52
    • 72

    Mostly Sunny

Today 18 Sep Dakota

Patchy fog this morning. Partly sunny this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 18 Sep Dakota

Mostly cloudy. A chance of Showers, mainly in the evening. Lows in the mid 50s. Southwest Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gateway Lake Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (3.1 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    65.1 °F

  • Highest 13 September, 2025

    91.9 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (3.1 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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