Horseshoe Lake Weather Forecast

    • 63
    • 81

    Mostly Sunny

    • 60
    • 87

    Chance Rain Showers

    • 55
    • 74

    Rain Showers Likely

    • 64
    • 74

    Rain Showers

    • 51
    • 75

    Slight Chance Rain Showers

    • 53
    • 67

    Partly Sunny

Today 10 Sep Union

Sunny. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 10 Sep Union

Mostly clear. Not as cool with Lows in the lower 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Horseshoe Lake Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (17.4 miles)

  • Lowest 1 September, 2026

    67.6 °F

  • Average September

    79.1 °F

  • Highest 3 September, 2026

    93.7 °F

Climate (2021–2026)

Sioux City, Sioux Gateway Airport (17.4 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    63.5 °F
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