Upper Sioux Agency State Park Weather Forecast

    • 48
    • 65

    Mostly Cloudy

    • 43
    • 58

    Mostly Cloudy

    • 43
    • 65

    Mostly Sunny

    • 48
    • 68

    Chance Rain Showers

    • 52
    • 68

    Mostly Cloudy

    • 55
    • 70

    Mostly Cloudy

    • 55
    • 72

    Partly Sunny

Today 20 Sep Yellow Medicine

Partly sunny. Highs in the lower 70s.

Tonight 20 Sep Yellow Medicine

Cloudy. A 20 percent chance of rain Showers after midnight. Lows in the upper 40s. Northeast 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

    68.8 °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

    58.4 °F
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