Upper Sioux Agency State Park Weather Forecast

    • 52
    • 64

    Mostly Cloudy

    • 49
    • 67

    Mostly Cloudy

    • 44
    • 61

    Chance Rain Showers

    • 43
    • 64

    Partly Sunny

    • 50
    • 68

    Slight Chance Rain Showers

    • 54
    • 70

    Partly Sunny

    • 57
    • 74

    Partly Sunny

Today 19 Sep Yellow Medicine

Partly sunny. Chance of rain Showers in the morning. Highs in the mid 70s. Chance of Showers 40 percent.

Tonight 19 Sep Yellow Medicine

Mostly cloudy. Lows in the lower 50s. North Winds 5 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 16 September, 2026

    44.6 °F

  • Average September

    69.2 °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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