Horseshoe Lake Weather Forecast
- 61
- 75
Thunderstorms Likely
- 56
- 77
Chance Thunderstorms
- 58
- 73
Chance Thunderstorms
- 60
- 79
Partly Sunny
- 59
- 82
Slight Chance Thunderstorms
- 55
- 82
Mostly Sunny
Today 17 Sep Union
Cloudy. A chance of Showers and Thunderstorms Early, then Showers and Thunderstorms likely. Not as warm with Highs in the mid 70s. Northeast Winds 5 to 10 Mph, becoming southeast. Chance of rain 70 percent.
Tonight 17 Sep Union
Mostly cloudy. Showers and Thunderstorms likely this Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows around 60. Southeast Winds 5 to 10 Mph. Chance of rain 60 percent.
Horseshoe Lake Temperature Statistics
September Temperature
Sioux City, Sioux Gateway Airport (17.4 miles)
Lowest 7 September, 2025
37.9 °FAverage September
65.1 °FHighest 13 September, 2025
91.9 °F
Climate (2020–Present)
Sioux City, Sioux Gateway Airport (17.4 miles)
Average Low 2020–2025
38.8 °FAverage 2020–2025
50.7 °FAverage High 2020–2025
62.6 °F