Upper Sioux Agency State Park Weather Forecast

    • 53
    • 67

    Rain Showers

    • 46
    • 71

    Mostly Sunny

    • 50
    • 67

    Chance Rain Showers

    • 55
    • 73

    Mostly Cloudy

    • 55
    • 73

    Chance Rain Showers

    • 51
    • 71

    Partly Sunny

Today 14 Sep Yellow Medicine

Breezy. Rain Showers early in the morning. Chance of Thunderstorms through the day. Rain Showers likely in the afternoon. Highs in the upper 60s. Southeast Winds 15 to 25 Mph with Gusts to around 40 Mph. Chance of precipitation near 100 percent.

Tonight 14 Sep Yellow Medicine

Mostly cloudy with a 20 percent chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 50s. Southwest Winds 5 to 15 Mph with Gusts to around 30 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 10 September, 2026

    50.5 °F

  • Average September

    72.9 °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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