Upper Sioux Agency State Park Weather Forecast

    • 51
    • 72

    Slight Chance Rain Showers

    • 51
    • 67

    Rain Showers

    • 51
    • 67

    Rain Showers

    • 47
    • 68

    Partly Sunny

    • 49
    • 67

    Mostly Cloudy

    • 50
    • 69

    Chance Rain Showers

Today 12 Sep Yellow Medicine

Cooler. Clear then becoming mostly sunny in the morning then becoming sunny. Highs in the lower 70s. Northwest Winds 10 to 15 Mph. Gusts up to 30 Mph early in the morning.

Tonight 12 Sep Yellow Medicine

Partly cloudy. Lows in the lower 50s. Northwest Winds up to 10 Mph.

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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 9 September, 2026

    55.8 °F

  • Average September

    74.1 °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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