Upper Sioux Agency State Park Weather Forecast

    • 56
    • 87

    Chance Thunderstorms

    • 50
    • 73

    Rain Showers Likely

    • 49
    • 61

    Rain Showers

    • 51
    • 71

    Chance Rain Showers

    • 48
    • 66

    Partly Sunny

    • 50
    • 66

    Chance Rain Showers

Today 11 Sep Yellow Medicine

Windy. Increasing Clouds. Highs in the upper 80s. South Winds 10 to 15 Mph with Gusts to around 35 Mph increasing to 20 to 30 Mph with Gusts to around 45 Mph.

Tonight 11 Sep Yellow Medicine

Breezy, cooler. Partly cloudy. A 20 percent chance of Thunderstorms in the evening. Lows in the upper 50s. Southwest Winds 15 to 25 Mph with Gusts to around 40 Mph shifting to the northwest 10 to 20 Mph after midnight.

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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

    75.1 °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

    37.5 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.5 °F
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