Upper Sioux Agency State Park Weather Forecast

    • 61
    • 72

    Increasing Clouds

    • 59
    • 67

    Rain Showers

    • 53
    • 70

    Chance Rain Showers

    • 44
    • 63

    Mostly Sunny

    • 47
    • 63

    Mostly Sunny

    • 49
    • 63

    Partly Sunny

Today 28 Sep Yellow Medicine

Mostly cloudy. Areas of dense fog early in the Morning, then patchy dense fog late in the morning. Highs in the lower 70s. Southeast Winds up to 10 Mph shifting to the south in the afternoon.

Tonight 28 Sep Yellow Medicine

Mostly cloudy. A 20 percent chance of Showers after midnight. Lows in the lower 60s. South Winds 10 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 16 September, 2026

    44.6 °F

  • Average September

    66.1 °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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