Upper Sioux Agency State Park Weather Forecast

    • 67
    • 81

    Rain Showers Likely

    • 69
    • 83

    Rain Showers Likely

    • 61
    • 84

    Partly Sunny

    • 53
    • 78

    Partly Sunny

    • 57
    • 80

    Partly Sunny

Today 6 Sep Yellow Medicine

Mostly cloudy with a 50 percent chance of Thunderstorms. Highs in the lower 80s. Southeast Winds 5 to 15 Mph.

Tonight 6 Sep Yellow Medicine

Mostly cloudy. A 30 percent chance of Thunderstorms early in the morning. Near steady temperature in the lower 70s. Southeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Upper Sioux Agency State Park Temperature Statistics

September Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 1 September, 2026

    57 °F

  • Average September

    75.5 °F

  • Highest 3 September, 2026

    92.8 °F

Climate (2021–2026)

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

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  • Average Low 2021–2026

    37.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.5 °F
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