Upper Sioux Agency State Park Weather Forecast

    • 68
    • 80

    Rain Showers Likely

    • 59
    • 83

    Partly Sunny

    • 52
    • 75

    Mostly Sunny

    • 59
    • 80

    Mostly Sunny

    • 56
    • 82

    Mostly Sunny

    • 51
    • 75

    Chance Rain Showers

Today 7 Sep Yellow Medicine

Mostly cloudy. Slight chance of Showers in the Morning, then chance of Thunderstorms in the afternoon. Highs in the lower 80s. Southeast Winds 10 to 20 Mph. Chance of precipitation 50 percent.

Tonight 7 Sep Yellow Medicine

Breezy. Mostly cloudy. Showers likely and chance of Thunderstorms in the Evening, then chance of Thunderstorms after midnight. Lows in the upper 60s. South Winds 15 to 25 Mph with Gusts to around 40 Mph. Chance of precipitation 70 percent.

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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

    76 °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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