Upper Sioux Agency State Park Weather Forecast

    • 58
    • 68

    Rain Showers

    • 54
    • 75

    Chance Rain Showers

    • 44
    • 64

    Mostly Sunny

    • 46
    • 63

    Mostly Sunny

    • 47
    • 65

    Partly Sunny

    • 43
    • 62

    Partly Sunny

Today 29 Sep Yellow Medicine

Mostly cloudy. Slight chance of Thunderstorms in the morning. Chance of Showers until late Afternoon, then slight chance of Showers late in the afternoon. Highs around 70. South Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 50 percent.

Tonight 29 Sep Yellow Medicine

Decreasing Clouds. Patchy fog after midnight. Lows in the upper 50s. Southwest 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 16 September, 2026

    44.6 °F

  • Average September

    66.2 °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

    58.4 °F
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